Added Z80 code from DS81.

1 files changed, 37 insertions, 34 deletions

diff --git a/doc/instruction.txt b/doc/instruction.txt
index f90f8b7..be4d9a5 100644
--- a/doc/instruction.txt
+++ b/doc/instruction.txt
@@ -1,45 +1,48 @@
-		      czx81 - A CURSES based ZX81 emulator
-			 Copyright (C) 2020 Ian Cowburn
-	      ZX81 ROM Copyright (C) 1981 Nine Tiles Networks LTD
+                      czx81 - A CURSES based ZX81 emulator
+                         Copyright (C) 2020 Ian Cowburn
+              ZX81 ROM Copyright (C) 1981 Nine Tiles Networks LTD
 
-KEYBOARD
---------
+LICENSE
+-------
+
+    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 3 of the License, or
+    (at your option) any later version.
 
-All normal characters should produce the equivalent character if it exists
-on the ZX81.  The emulator assumes you can generate the characters A-Z which
-will be mapped to the equivalent ZX81 key when a lower case character is
-entered.  An upper case character will generate the shifted version of the
-character as it appeared on the ZX81 keyboard.
+    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.
 
-The cursor keys should act as cursor keys.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-The ESCAPE key will display the runtime menu.
 
-The following keys have the following effects:
+KEYBOARD
+--------
 
-F1		- Emulate the EDIT key (shift 1)
-F2		- Emulate the AND key (shift 2)
-F3		- Emulate the THEN key (shift 3)
-F4		- Emulate the TO key (shift 4)
-F5		- Emulate the GRAPHICS key (shift 9)
-F6		- Emulate the FUNCTION key (shift new line)
-F7		- Emulate the BREAK key (shift space)
-BACKSPACE	- Emulate the RUBOUT key (shift 0)
-DELETE		- Emulate the RUBOUT key (shift 0)
+    All normal characters should produce the equivalent character if it exists
+    on the ZX81.  The emulator assumes you can generate the characters A-Z which
+    will be mapped to the equivalent ZX81 key when a lower case character is
+    entered.  An upper case character will generate the shifted version of the
+    character as it appeared on the ZX81 keyboard.
 
+    The cursor keys should act as cursor keys.
 
-LICENSE
--------
+    The ESCAPE key will display the runtime menu.
+
+    The following keys have the following effects:
 
-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 3 of the License, or
-(at your option) any later version.
+    F1          - Emulate the EDIT key (shift 1)
+    F2          - Emulate the AND key (shift 2)
+    F3          - Emulate the THEN key (shift 3)
+    F4          - Emulate the TO key (shift 4)
+    F5          - Emulate the GRAPHICS key (shift 9)
+    F6          - Emulate the FUNCTION key (shift new line)
+    F7          - Emulate the BREAK key (shift space)
+    BACKSPACE   - Emulate the RUBOUT key (shift 0)
+    DELETE      - Emulate the RUBOUT key (shift 0)
 
-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, see <http://www.gnu.org/licenses/>.
+ vim: expandtab spell