Working version with a few games included

28 files changed, 1394 insertions, 82 deletions

diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..abd3cf7
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,341 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 19yy  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) 19yy name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
+
diff --git a/README b/README
new file mode 100644
index 0000000..1e99a89
--- /dev/null
+++ b/README
@@ -0,0 +1,20 @@
+The code to DS81 is released under the GNU General Public License.  See COPYING
+for details.
+
+Other included software is provided in good faith, is not released under the GPL
+and is copyright their respective authors.
+
+If any of these authors disagree with this distribution of their work please
+contact me:
+
+	 ZX81 BASIC ROM
+	    (c) 1981
+    Nine Tiles Networks LTD
+
+	3D Monster Maze
+	    (c) 1983
+	Malcom E. Evans
+
+    City Patrol and Sabotage
+	    (c) 1982
+	  Don Priestley
diff --git a/arm9/COPYING b/arm9/COPYING
new file mode 100644
index 0000000..abd3cf7
--- /dev/null
+++ b/arm9/COPYING
@@ -0,0 +1,341 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 19yy  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) 19yy name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
+
diff --git a/arm9/README b/arm9/README
new file mode 100644
index 0000000..1e99a89
--- /dev/null
+++ b/arm9/README
@@ -0,0 +1,20 @@
+The code to DS81 is released under the GNU General Public License.  See COPYING
+for details.
+
+Other included software is provided in good faith, is not released under the GPL
+and is copyright their respective authors.
+
+If any of these authors disagree with this distribution of their work please
+contact me:
+
+	 ZX81 BASIC ROM
+	    (c) 1981
+    Nine Tiles Networks LTD
+
+	3D Monster Maze
+	    (c) 1983
+	Malcom E. Evans
+
+    City Patrol and Sabotage
+	    (c) 1982
+	  Don Priestley
diff --git a/arm9/data/cpatrol.bin b/arm9/data/cpatrol.bin
new file mode 100644
index 0000000..05dda79
--- /dev/null
+++ b/arm9/data/cpatrol.bin
diff --git a/arm9/data/cpatrol_inlay.bin b/arm9/data/cpatrol_inlay.bin
new file mode 100644
index 0000000..af70c60
--- /dev/null
+++ b/arm9/data/cpatrol_inlay.bin
diff --git a/arm9/data/maze_inlay.bin b/arm9/data/maze_inlay.bin
new file mode 100644
index 0000000..26a7e97
--- /dev/null
+++ b/arm9/data/maze_inlay.bin
diff --git a/arm9/data/sabotage.bin b/arm9/data/sabotage.bin
new file mode 100644
index 0000000..eb9c19d
--- /dev/null
+++ b/arm9/data/sabotage.bin
diff --git a/arm9/data/sabotage_inlay.bin b/arm9/data/sabotage_inlay.bin
new file mode 100644
index 0000000..da3f094
--- /dev/null
+++ b/arm9/data/sabotage_inlay.bin
diff --git a/arm9/include/framebuffer.h b/arm9/include/framebuffer.h
index 80a9469..c6d087f 100644
--- a/arm9/include/framebuffer.h
+++ b/arm9/include/framebuffer.h
@@ -32,5 +32,6 @@ void	FB_VLine(int x, int y1, int y2, int colour);
 void	FB_Box(int x, int y, int w, int h, int colour);
 void	FB_FillBox(int x, int y, int w, int h, int colour);
 void	FB_Clear(void);
+void	FB_Blit(sImage *img, int x, int y);
 
 #endif	/* DS81_FRAMEBUFFER_H */
diff --git a/arm9/include/tapes.h b/arm9/include/tapes.h
new file mode 100644
index 0000000..5170f17
--- /dev/null
+++ b/arm9/include/tapes.h
@@ -0,0 +1,27 @@
+/*
+   ds81 - Nintendo DS ZX81 emulator.
+
+   Copyright (C) 2006  Ian Cowburn
+   
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+  
+   $Id$
+*/
+#ifndef DS81_TAPES_H
+#define DS81_TAPES_H
+
+void	SelectTape(void);
+
+#endif	/* DS81_TAPES_H */
diff --git a/arm9/include/zx81.h b/arm9/include/zx81.h
index c1364d1..3d73955 100644
--- a/arm9/include/zx81.h
+++ b/arm9/include/zx81.h
@@ -39,6 +39,24 @@ void	ZX81Init(uint16 *vram, Z80 *z80);
 */
 void	ZX81HandleKey(SoftKey k, int is_pressed);
 
+/* Set a file to load from tape
+*/
+void	ZX81SetTape(const Z80Byte *image, int len);
+
+/* Reset the 81
+*/
+void	ZX81Reset(Z80 *z80);
+
+/* Displays a string on the ZX81's dislpay.  The screen is cleared and the
+   string displayed with \n characters breaking the line.
+
+   Not all characters can be respresented by the ZX81, and the screen will be
+   lost on the next emulation update cycle.
+
+   The character '%' toggles inverse video.
+*/
+void	ZX81DisplayString(const char *p);
+
 /* Interfaces for the Z80
 */
 Z80Byte	ZX81ReadMem(Z80 *z80, Z80Word addr);
diff --git a/arm9/source/framebuffer.c b/arm9/source/framebuffer.c
index 26b95de..22a4e12 100644
--- a/arm9/source/framebuffer.c
+++ b/arm9/source/framebuffer.c
@@ -253,3 +253,22 @@ void FB_Clear(void)
     	*p++=0x8000;
     }
 }
+
+
+void FB_Blit(sImage *img, int x, int y)
+{
+    if (img->width==WIDTH && img->height==HEIGHT)
+    {
+	dmaCopy(img->data8,buff,SCREEN_WIDTH*SCREEN_HEIGHT*2);
+    }
+    else
+    {
+    	int f;
+
+	for(f=0;f<img->height;f++)
+	{
+	    dmaCopy(img->data16+(f*img->width),
+		    buff+x+(y+f)*WIDTH,img->width*2);
+	}
+    }
+}
diff --git a/arm9/source/main.c b/arm9/source/main.c
index 43c8993..78d40c1 100644
--- a/arm9/source/main.c
+++ b/arm9/source/main.c
@@ -29,6 +29,7 @@
 #include "keyboard.h"
 #include "z80.h"
 #include "zx81.h"
+#include "tapes.h"
 
 #include "splashimg_bin.h"
 #include "rom_font_bin.h"
@@ -38,8 +39,9 @@
 static const char *main_menu[]=
 	{
 	    "Reset ZX81",
-	    "Sticky Keys On",
-	    "Sticky Keys Off",
+	    "Select Tape",
+	    "Sticky Shift On",
+	    "Sticky Shift Off",
 	    "Define Joystick",
 	    "Cancel",
 	    NULL
@@ -48,6 +50,7 @@ static const char *main_menu[]=
 typedef enum
 {
     MenuReset,
+    MenuSelectTape,
     MenuStickyOn,
     MenuStickyOff,
     MenuDefineJoystick
@@ -89,13 +92,16 @@ static void Splash(void)
 
     loadPCX(splashimg_bin,&img);
     image8to16(&img);
-    dmaCopy(img.data8,BG_GFX_SUB,SCREEN_WIDTH*SCREEN_HEIGHT*2);
+
+    FB_Blit(&img,0,0);
 
     for(f=0;text[f];f++)
     {
 	FB_Centre(text[f],40+f*8,FB_RGB(31,31,31),-1);
     }
 
+    ZX81DisplayString("10 print '%the zx81 is ace%'\n20 goto 10");
+
     while(!(keysDown() & KEY_A))
     {
 	swiWaitForVBlank();
@@ -147,8 +153,6 @@ int main(int argc, char *argv[])
 
     FB_Init(BG_GFX_SUB);
 
-    Splash();
-
     z80 = Z80Init(ZX81ReadMem,
 		  ZX81WriteMem,
 		  ZX81ReadPort,
@@ -162,6 +166,8 @@ int main(int argc, char *argv[])
 
     ZX81Init((uint16*)SCREEN_BASE_BLOCK(0), z80);
 
+    Splash();
+
     SK_DisplayKeyboard(BG_GFX_SUB);
 
     SK_SetSticky(SK_SHIFT,1);
@@ -186,6 +192,10 @@ int main(int argc, char *argv[])
 				ZX81Reset(z80);
 				break;
 
+			    case MenuSelectTape:
+			    	SelectTape();
+				break;
+
 			    case MenuStickyOn:
 				SK_SetSticky(SK_SHIFT,1);
 				break;
diff --git a/arm9/source/tapes.c b/arm9/source/tapes.c
new file mode 100644
index 0000000..adac3b6
--- /dev/null
+++ b/arm9/source/tapes.c
@@ -0,0 +1,175 @@
+/*
+   ds81 - Nintendo DS ZX81 emulator.
+
+   Copyright (C) 2006  Ian Cowburn
+   
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+  
+   $Id$
+*/
+
+#include <nds.h>
+
+#include "tapes.h"
+#include "framebuffer.h"
+#include "zx81.h"
+
+#include "maze_bin.h"
+#include "maze_inlay_bin.h"
+#include "cpatrol_bin.h"
+#include "cpatrol_inlay_bin.h"
+#include "sabotage_bin.h"
+#include "sabotage_inlay_bin.h"
+
+
+/* ---------------------------------------- STATIC DATA
+*/
+typedef struct
+{
+    const u8	*tape;
+    const u32	*tape_len;
+    sImage	img;
+    void	*source_pcx;
+    const char	*text;
+} Tape;
+
+#define NO_TAPES	3
+
+static Tape	tapes[NO_TAPES]=
+		{
+		    {
+		    	maze_bin,
+			&maze_bin_size,
+			{0},
+			maze_inlay_bin,
+			"%3d monster maze%\n"
+			"(c) 1983 Malcom E. Evans\n\n"
+			"Escape the maze and its T-Rex\n"
+			"\n\n"
+			"%note% when the screen goes grey\n"
+			"for 30-60 seconds this is not a\n"
+			"problem, and is the game creating\n"
+			"the lair of rex."
+		    },
+		    {
+		    	cpatrol_bin,
+			&cpatrol_bin_size,
+			{0},
+			cpatrol_inlay_bin,
+			"%city patrol%\n"
+			"(c) 1982 Don Priestley\n\n"
+			"Defend the city from the aliens.\n\n"
+			"yes - that parallax city was\n"
+			"done with a text mode and the\n"
+			"equivalent of a 0.8mhz z80"
+		    },
+		    {
+		    	sabotage_bin,
+			&sabotage_bin_size,
+			{0},
+			sabotage_inlay_bin,
+			"%sabotage%\n"
+			"(c) 1982 Don Priestley\n\n"
+			"Destroy the boxes before the\n"
+			"guard finds you.\n\n"
+			"or find the saboteur as the\n"
+			"guard.\n\n"
+			"while this game may not feature\n"
+			"the dazzling graphics of other\n"
+			"ZX81 games it more than makes\n"
+			"up with a simply joyous\n"
+			"gameplay mechanic.\n"
+		    }
+		};
+
+
+static int	current=0;
+
+/* ---------------------------------------- PRIVATE INTERFACES
+*/
+static void InitTapes(void)
+{
+    static int init=FALSE;
+    int f;
+
+    if (init)
+    {
+    	return;
+    }
+
+    init=TRUE;
+
+    for(f=0;f<NO_TAPES;f++)
+    {
+    	loadPCX(tapes[f].source_pcx,&tapes[f].img);
+	image8to16(&tapes[f].img);
+    }
+}
+
+static void DisplayTape(Tape *t)
+{
+    FB_Clear();
+    FB_Blit(&t->img,255-t->img.width,0);
+
+    FB_Print("LEFT/RIGHT",0,0,FB_RGB(255,255,255),-1);
+    FB_Print("to choose",0,10,FB_RGB(255,255,255),-1);
+    FB_Print("A to select",0,30,FB_RGB(255,255,255),-1);
+    FB_Print("B to cancel",0,40,FB_RGB(255,255,255),-1);
+
+    ZX81DisplayString(t->text);
+}
+
+/* ---------------------------------------- PUBLIC INTERFACES
+*/
+void SelectTape(void)
+{
+    int done=FALSE;
+
+    InitTapes();
+
+    while(!done)
+    {
+	uint32 key=0;
+
+    	DisplayTape(tapes+current);
+
+        do
+        {
+            swiWaitForVBlank();
+        } while(!(key=keysDownRepeat()));
+
+	if (key & KEY_LEFT)
+	{
+	    if (--current<0)
+	    {
+	    	current=NO_TAPES-1;
+	    }
+	}
+	else if (key & KEY_RIGHT)
+	{
+	    current=(current+1)%NO_TAPES;
+	}
+	else if (key & KEY_A)
+	{
+	    done=TRUE;
+	    ZX81SetTape(tapes[current].tape,*tapes[current].tape_len);
+	}
+	else if (key & KEY_B)
+	{
+	    done=TRUE;
+	}
+    }
+}
+
diff --git a/arm9/source/zx81.c b/arm9/source/zx81.c
index 5b8f6b7..2b81e2b 100644
--- a/arm9/source/zx81.c
+++ b/arm9/source/zx81.c
@@ -25,12 +25,12 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <ctype.h>
 #include <nds.h>
 
 #include "zx81.h"
 
 #include "zx81_bin.h"
-#include "maze_bin.h"
 
 #ifndef TRUE
 #define TRUE 1
@@ -84,6 +84,11 @@ static Z80Word		RAMLEN=0;
 
 #define WORD(a)		(mem[a] | (Z80Word)mem[a+1]<<8)
 
+/* Tape
+*/
+static const Z80Byte	*tape_image;
+static int		tape_len;
+
 /* GFX vars
 */
 static uint16		*screen;
@@ -199,58 +204,52 @@ static void RomPatch(void)
     mem[0x02ec]=0;
 }
 
-static char ToASCII(Z80Byte b)
+static Z80Byte FromASCII(char c)
 {
-    if (b==0)			/* SPACE */
-    	return ' ';
-    
-    if (b==22)			/* Dash (-) */
-    	return '-';
-
-    if (b==27)			/* Period (.) */
-    	return '.';
-
-    if (b>=28 && b<=37)		/* 0-9 */
-    	return '0'+b-28;
+    switch(c)
+    {
+	case '\'':
+	case '"':
+	    return 11;
 
-    if (b>=38 && b<=63)		/* A-Z */
-    	return 'a'+b-38;
+	case '(':
+	    return 16;
 
-    return 0;
-}
+	case ')':
+	    return 17;
 
+    	case '-':
+	    return 22;
 
-static const char *ConvertFilename(Z80Word addr)
-{
-    static char buff[FILENAME_MAX];
-    char *p;
+	case '*':
+	    return 23;
 
-    p=buff;
-    *p=0;
+	case ',':
+	    return 26;
 
-    if (addr>0x8000)
-    {
-    	return buff;
+	case '.':
+	    return 27;
     }
 
-    do
-    {
-    	char c=ToASCII(mem[addr]&0x7f);
+    if (c>='0' && c<='9')
+	return (c-'0')+28;
 
-	if (c)
-	    *p++=c;
+    if (c>='a' && c<='z')
+    	return (c-'a')+38;
 
-    } while(mem[addr++]<0x80);
+    if (c>='A' && c<='Z')
+    	return (c-'A')+38;
 
-    *p=0;
-
-    return buff;
+    return 0;
 }
 
 
 static void LoadTape(Z80 *z80)
 {
-    memcpy(mem+0x4009,maze_bin,maze_bin_size);
+    if (tape_image)
+    {
+	memcpy(mem+0x4009,tape_image,tape_len);
+    }
 }
 
 
@@ -630,4 +629,50 @@ void ZX81Reset(Z80 *z80)
 }
 
 
+void ZX81SetTape(const Z80Byte *image, int len)
+{
+    tape_image=image;
+    tape_len=len;
+}
+
+
+void ZX81DisplayString(const char *p)
+{
+    uint16 *s;
+    uint16 inv=0;
+    int f;
+
+    s = screen;
+
+    for(f=0;f<TXT_W*TXT_H;f++)
+    {
+    	*s++=0;
+    }
+
+    s = screen;
+    f = 0;
+
+    while(*p)
+    {
+	switch(*p)
+	{
+	    case '\n':
+		s+=32;
+		f=0;
+		break;
+
+	    case '%':
+	    	inv^=0x40;
+		break;
+
+	    default:
+		s[f++]=FromASCII(*p)|inv;
+		break;
+	}
+
+	p++;
+    }
+}
+
+
 /* END OF FILE */
diff --git a/data/cpatrol.bin b/data/cpatrol.bin
new file mode 100644
index 0000000..05dda79
--- /dev/null
+++ b/data/cpatrol.bin
diff --git a/data/cpatrol_inlay.bin b/data/cpatrol_inlay.bin
new file mode 100644
index 0000000..af70c60
--- /dev/null
+++ b/data/cpatrol_inlay.bin
diff --git a/data/maze_inlay.bin b/data/maze_inlay.bin
new file mode 100644
index 0000000..26a7e97
--- /dev/null
+++ b/data/maze_inlay.bin
diff --git a/data/sabotage.bin b/data/sabotage.bin
new file mode 100644
index 0000000..eb9c19d
--- /dev/null
+++ b/data/sabotage.bin
diff --git a/data/sabotage_inlay.bin b/data/sabotage_inlay.bin
new file mode 100644
index 0000000..da3f094
--- /dev/null
+++ b/data/sabotage_inlay.bin
diff --git a/include/framebuffer.h b/include/framebuffer.h
index 80a9469..c6d087f 100644
--- a/include/framebuffer.h
+++ b/include/framebuffer.h
@@ -32,5 +32,6 @@ void	FB_VLine(int x, int y1, int y2, int colour);
 void	FB_Box(int x, int y, int w, int h, int colour);
 void	FB_FillBox(int x, int y, int w, int h, int colour);
 void	FB_Clear(void);
+void	FB_Blit(sImage *img, int x, int y);
 
 #endif	/* DS81_FRAMEBUFFER_H */
diff --git a/include/tapes.h b/include/tapes.h
new file mode 100644
index 0000000..5170f17
--- /dev/null
+++ b/include/tapes.h
@@ -0,0 +1,27 @@
+/*
+   ds81 - Nintendo DS ZX81 emulator.
+
+   Copyright (C) 2006  Ian Cowburn
+   
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+  
+   $Id$
+*/
+#ifndef DS81_TAPES_H
+#define DS81_TAPES_H
+
+void	SelectTape(void);
+
+#endif	/* DS81_TAPES_H */
diff --git a/include/zx81.h b/include/zx81.h
index c1364d1..3d73955 100644
--- a/include/zx81.h
+++ b/include/zx81.h
@@ -39,6 +39,24 @@ void	ZX81Init(uint16 *vram, Z80 *z80);
 */
 void	ZX81HandleKey(SoftKey k, int is_pressed);
 
+/* Set a file to load from tape
+*/
+void	ZX81SetTape(const Z80Byte *image, int len);
+
+/* Reset the 81
+*/
+void	ZX81Reset(Z80 *z80);
+
+/* Displays a string on the ZX81's dislpay.  The screen is cleared and the
+   string displayed with \n characters breaking the line.
+
+   Not all characters can be respresented by the ZX81, and the screen will be
+   lost on the next emulation update cycle.
+
+   The character '%' toggles inverse video.
+*/
+void	ZX81DisplayString(const char *p);
+
 /* Interfaces for the Z80
 */
 Z80Byte	ZX81ReadMem(Z80 *z80, Z80Word addr);
diff --git a/source/framebuffer.c b/source/framebuffer.c
index 26b95de..22a4e12 100644
--- a/source/framebuffer.c
+++ b/source/framebuffer.c
@@ -253,3 +253,22 @@ void FB_Clear(void)
     	*p++=0x8000;
     }
 }
+
+
+void FB_Blit(sImage *img, int x, int y)
+{
+    if (img->width==WIDTH && img->height==HEIGHT)
+    {
+	dmaCopy(img->data8,buff,SCREEN_WIDTH*SCREEN_HEIGHT*2);
+    }
+    else
+    {
+    	int f;
+
+	for(f=0;f<img->height;f++)
+	{
+	    dmaCopy(img->data16+(f*img->width),
+		    buff+x+(y+f)*WIDTH,img->width*2);
+	}
+    }
+}
diff --git a/source/main.c b/source/main.c
index 43c8993..78d40c1 100644
--- a/source/main.c
+++ b/source/main.c
@@ -29,6 +29,7 @@
 #include "keyboard.h"
 #include "z80.h"
 #include "zx81.h"
+#include "tapes.h"
 
 #include "splashimg_bin.h"
 #include "rom_font_bin.h"
@@ -38,8 +39,9 @@
 static const char *main_menu[]=
 	{
 	    "Reset ZX81",
-	    "Sticky Keys On",
-	    "Sticky Keys Off",
+	    "Select Tape",
+	    "Sticky Shift On",
+	    "Sticky Shift Off",
 	    "Define Joystick",
 	    "Cancel",
 	    NULL
@@ -48,6 +50,7 @@ static const char *main_menu[]=
 typedef enum
 {
     MenuReset,
+    MenuSelectTape,
     MenuStickyOn,
     MenuStickyOff,
     MenuDefineJoystick
@@ -89,13 +92,16 @@ static void Splash(void)
 
     loadPCX(splashimg_bin,&img);
     image8to16(&img);
-    dmaCopy(img.data8,BG_GFX_SUB,SCREEN_WIDTH*SCREEN_HEIGHT*2);
+
+    FB_Blit(&img,0,0);
 
     for(f=0;text[f];f++)
     {
 	FB_Centre(text[f],40+f*8,FB_RGB(31,31,31),-1);
     }
 
+    ZX81DisplayString("10 print '%the zx81 is ace%'\n20 goto 10");
+
     while(!(keysDown() & KEY_A))
     {
 	swiWaitForVBlank();
@@ -147,8 +153,6 @@ int main(int argc, char *argv[])
 
     FB_Init(BG_GFX_SUB);
 
-    Splash();
-
     z80 = Z80Init(ZX81ReadMem,
 		  ZX81WriteMem,
 		  ZX81ReadPort,
@@ -162,6 +166,8 @@ int main(int argc, char *argv[])
 
     ZX81Init((uint16*)SCREEN_BASE_BLOCK(0), z80);
 
+    Splash();
+
     SK_DisplayKeyboard(BG_GFX_SUB);
 
     SK_SetSticky(SK_SHIFT,1);
@@ -186,6 +192,10 @@ int main(int argc, char *argv[])
 				ZX81Reset(z80);
 				break;
 
+			    case MenuSelectTape:
+			    	SelectTape();
+				break;
+
 			    case MenuStickyOn:
 				SK_SetSticky(SK_SHIFT,1);
 				break;
diff --git a/source/tapes.c b/source/tapes.c
new file mode 100644
index 0000000..adac3b6
--- /dev/null
+++ b/source/tapes.c
@@ -0,0 +1,175 @@
+/*
+   ds81 - Nintendo DS ZX81 emulator.
+
+   Copyright (C) 2006  Ian Cowburn
+   
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+  
+   $Id$
+*/
+
+#include <nds.h>
+
+#include "tapes.h"
+#include "framebuffer.h"
+#include "zx81.h"
+
+#include "maze_bin.h"
+#include "maze_inlay_bin.h"
+#include "cpatrol_bin.h"
+#include "cpatrol_inlay_bin.h"
+#include "sabotage_bin.h"
+#include "sabotage_inlay_bin.h"
+
+
+/* ---------------------------------------- STATIC DATA
+*/
+typedef struct
+{
+    const u8	*tape;
+    const u32	*tape_len;
+    sImage	img;
+    void	*source_pcx;
+    const char	*text;
+} Tape;
+
+#define NO_TAPES	3
+
+static Tape	tapes[NO_TAPES]=
+		{
+		    {
+		    	maze_bin,
+			&maze_bin_size,
+			{0},
+			maze_inlay_bin,
+			"%3d monster maze%\n"
+			"(c) 1983 Malcom E. Evans\n\n"
+			"Escape the maze and its T-Rex\n"
+			"\n\n"
+			"%note% when the screen goes grey\n"
+			"for 30-60 seconds this is not a\n"
+			"problem, and is the game creating\n"
+			"the lair of rex."
+		    },
+		    {
+		    	cpatrol_bin,
+			&cpatrol_bin_size,
+			{0},
+			cpatrol_inlay_bin,
+			"%city patrol%\n"
+			"(c) 1982 Don Priestley\n\n"
+			"Defend the city from the aliens.\n\n"
+			"yes - that parallax city was\n"
+			"done with a text mode and the\n"
+			"equivalent of a 0.8mhz z80"
+		    },
+		    {
+		    	sabotage_bin,
+			&sabotage_bin_size,
+			{0},
+			sabotage_inlay_bin,
+			"%sabotage%\n"
+			"(c) 1982 Don Priestley\n\n"
+			"Destroy the boxes before the\n"
+			"guard finds you.\n\n"
+			"or find the saboteur as the\n"
+			"guard.\n\n"
+			"while this game may not feature\n"
+			"the dazzling graphics of other\n"
+			"ZX81 games it more than makes\n"
+			"up with a simply joyous\n"
+			"gameplay mechanic.\n"
+		    }
+		};
+
+
+static int	current=0;
+
+/* ---------------------------------------- PRIVATE INTERFACES
+*/
+static void InitTapes(void)
+{
+    static int init=FALSE;
+    int f;
+
+    if (init)
+    {
+    	return;
+    }
+
+    init=TRUE;
+
+    for(f=0;f<NO_TAPES;f++)
+    {
+    	loadPCX(tapes[f].source_pcx,&tapes[f].img);
+	image8to16(&tapes[f].img);
+    }
+}
+
+static void DisplayTape(Tape *t)
+{
+    FB_Clear();
+    FB_Blit(&t->img,255-t->img.width,0);
+
+    FB_Print("LEFT/RIGHT",0,0,FB_RGB(255,255,255),-1);
+    FB_Print("to choose",0,10,FB_RGB(255,255,255),-1);
+    FB_Print("A to select",0,30,FB_RGB(255,255,255),-1);
+    FB_Print("B to cancel",0,40,FB_RGB(255,255,255),-1);
+
+    ZX81DisplayString(t->text);
+}
+
+/* ---------------------------------------- PUBLIC INTERFACES
+*/
+void SelectTape(void)
+{
+    int done=FALSE;
+
+    InitTapes();
+
+    while(!done)
+    {
+	uint32 key=0;
+
+    	DisplayTape(tapes+current);
+
+        do
+        {
+            swiWaitForVBlank();
+        } while(!(key=keysDownRepeat()));
+
+	if (key & KEY_LEFT)
+	{
+	    if (--current<0)
+	    {
+	    	current=NO_TAPES-1;
+	    }
+	}
+	else if (key & KEY_RIGHT)
+	{
+	    current=(current+1)%NO_TAPES;
+	}
+	else if (key & KEY_A)
+	{
+	    done=TRUE;
+	    ZX81SetTape(tapes[current].tape,*tapes[current].tape_len);
+	}
+	else if (key & KEY_B)
+	{
+	    done=TRUE;
+	}
+    }
+}
+
diff --git a/source/zx81.c b/source/zx81.c
index 5b8f6b7..2b81e2b 100644
--- a/source/zx81.c
+++ b/source/zx81.c
@@ -25,12 +25,12 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <ctype.h>
 #include <nds.h>
 
 #include "zx81.h"
 
 #include "zx81_bin.h"
-#include "maze_bin.h"
 
 #ifndef TRUE
 #define TRUE 1
@@ -84,6 +84,11 @@ static Z80Word		RAMLEN=0;
 
 #define WORD(a)		(mem[a] | (Z80Word)mem[a+1]<<8)
 
+/* Tape
+*/
+static const Z80Byte	*tape_image;
+static int		tape_len;
+
 /* GFX vars
 */
 static uint16		*screen;
@@ -199,58 +204,52 @@ static void RomPatch(void)
     mem[0x02ec]=0;
 }
 
-static char ToASCII(Z80Byte b)
+static Z80Byte FromASCII(char c)
 {
-    if (b==0)			/* SPACE */
-    	return ' ';
-    
-    if (b==22)			/* Dash (-) */
-    	return '-';
-
-    if (b==27)			/* Period (.) */
-    	return '.';
-
-    if (b>=28 && b<=37)		/* 0-9 */
-    	return '0'+b-28;
+    switch(c)
+    {
+	case '\'':
+	case '"':
+	    return 11;
 
-    if (b>=38 && b<=63)		/* A-Z */
-    	return 'a'+b-38;
+	case '(':
+	    return 16;
 
-    return 0;
-}
+	case ')':
+	    return 17;
 
+    	case '-':
+	    return 22;
 
-static const char *ConvertFilename(Z80Word addr)
-{
-    static char buff[FILENAME_MAX];
-    char *p;
+	case '*':
+	    return 23;
 
-    p=buff;
-    *p=0;
+	case ',':
+	    return 26;
 
-    if (addr>0x8000)
-    {
-    	return buff;
+	case '.':
+	    return 27;
     }
 
-    do
-    {
-    	char c=ToASCII(mem[addr]&0x7f);
+    if (c>='0' && c<='9')
+	return (c-'0')+28;
 
-	if (c)
-	    *p++=c;
+    if (c>='a' && c<='z')
+    	return (c-'a')+38;
 
-    } while(mem[addr++]<0x80);
+    if (c>='A' && c<='Z')
+    	return (c-'A')+38;
 
-    *p=0;
-
-    return buff;
+    return 0;
 }
 
 
 static void LoadTape(Z80 *z80)
 {
-    memcpy(mem+0x4009,maze_bin,maze_bin_size);
+    if (tape_image)
+    {
+	memcpy(mem+0x4009,tape_image,tape_len);
+    }
 }
 
 
@@ -630,4 +629,50 @@ void ZX81Reset(Z80 *z80)
 }
 
 
+void ZX81SetTape(const Z80Byte *image, int len)
+{
+    tape_image=image;
+    tape_len=len;
+}
+
+
+void ZX81DisplayString(const char *p)
+{
+    uint16 *s;
+    uint16 inv=0;
+    int f;
+
+    s = screen;
+
+    for(f=0;f<TXT_W*TXT_H;f++)
+    {
+    	*s++=0;
+    }
+
+    s = screen;
+    f = 0;
+
+    while(*p)
+    {
+	switch(*p)
+	{
+	    case '\n':
+		s+=32;
+		f=0;
+		break;
+
+	    case '%':
+	    	inv^=0x40;
+		break;
+
+	    default:
+		s[f++]=FromASCII(*p)|inv;
+		break;
+	}
+
+	p++;
+    }
+}
+
+
 /* END OF FILE */