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DS81
---------==============================---------
Copyright 2006 Ian Cowburn
ianc@noddybox.co.uk
1. LICENSE
----------
The code to DS81 is released under the GNU General Public License. See
the text file COPYING for details.
Other included software is provided in good faith, is not released under
the GNU General Public License, and is copyright their respective authors.
If any of these authors disagree with the distribution of their work then
contact me and it will be gladly removed.
ZX81 BASIC ROM (c) 1981 Nine Tiles Networks LTD
3D Monster Maze (c) 1983 Malcom E. Evans
Mazogs, City Patrol and Sabotage (c) 1981, 1982 Don Priestley
2. ZX81
-------
The ZX81 was an 8-bit computer released by Sinclair Research in 1981, using
the Z80 CPU.
It was a monochrome machine with no sound (be quiet those at the back of
the room who used to be able to do sound by doing odd things with the video
signal) and a text mode that could be used to plot graphics at a resolution
of 64 by 44 (hmmm, smaller than most icons nowadays).
It came with 1K of RAM, though most people opted for a massive 16K RAM pack.
2. DS81
-------
DS81 is an emulation of the 16K ZX81 and is is supplied in two main forms,
as a native Nintendo DS executable and a version with a Gameboy Advance
wrapper (in case your Ninentdo DS homebrew device only supports running
GBA executables).
In addition to this two different versions are supplied, one which
initialises the FAT library and one which doesn't. They are identical save
for this, and separate ones are supplied in case the FAT library
initialisation causes problem on your homebrew device:
ds81.nds - Nintendo DS version
ds81.bs.gba - As above with a GBA wrapper.
ds81-nofat.nds - Nintendo DS version; no FAT library initialisation.
ds81-nofat.bs.gba - As above with a GBA wrapper.
I'm probably being overly paranoid there, but better safe than sorry.
3. Using DS81
-------------
When run DS81 displays a splash screen with copyright information and
whether the FAT library has been able to find a supported device for the
loading of external tapes.
Once the A button has been pressed the ZX81 resets and displays itself
on the top screen, and a soft keyboard is displayed on the bottom, touch
sensitive, DS screen.
If you've never used a ZX81 before then you may wish to find out how the
keyboard works -- it uses a keyword entry system, rather than the straight
typing if commands. So, for instance, the key P is pressed to enter PRINT
when the cursor is in keyword mode (the cursor in an inverted K).
Trust me; you were glad of it when using the original ZX81's hard plastic
membrane keyboard.
When using the soft keyboard by default the shift key is 'sticky' and once
used will stay held down until pressed again.
The World of Spectrum has the original ZX81 manuals, either as a PDF
or in HTML form:
http://www.worldofspectrum.org/
At the bottom of the keyboard is an area where you can click to bring up a
menu. Either use the stylus, or the joypad and button A to select an
option from the following choices:
RESET ZX81
This resets the emulated ZX81.
SELECT TAPE
Selects the built-in tape to use (DS81 has a number of ZX81 tapes
built into it). The next section has extra information on the
loading of games.
STICK SHIFT ON
Sets the shift key so it stays down until pressed again.
STICK SHIFT OFF
Sets the shift key so it behaves likes all the other keys.
MAP JOYPAD TO KEYS
Allows you to redefine the DS's joypad and buttons to ZX81 keys.
Follow the on-screen instructions.
CANCEL
Cancels the menu.
3. Using the internal tapes on DS81
-----------------------------------
Games on the ZX81 were supplied on cassette. DS81 includes a few tape
files that are selectable from the menu. Follow the on-screen instructions
to select the game. A quick description and the controls to use are
displayed on the top screen.
Once you've selected a tape you can load it in the emulator by using the
command LOAD "". If you're really stuck with the ZX81 keyboard:
1. Select your tape.
2. Reset the ZX81 from the menu.
3. When the inverse K cursor is displayed press the J key to generate
the keyword LOAD.
4. Press the SHIFT key.
5. Press the P key twice to enter the double quotes (DON'T use the
double quotes got by pressing SHIFT+Q. These are not the same!)
6. Release the SHIFT key and press the NEW LINE key.
7. The tape will load and run.
3. Using external tapes on DS81
-------------------------------
If you are using the version of DS81 that allows the use of FAT devices,
and you device is supported, they you can load any old tape.
Simply place the .P file (ZX81 games are usually distributed as .P files
that are simply an image of the memory that would have been dumped to tape)
and either put it in the root directory of the FAT device or in a directory
called ZX81SNAP.
Note that currently hi-resolution games will not work. For that matter,
it can't be at all guaranteed that all original ZX81 games will work as
expected. After all, DS81 isn't really a ZX81.
-------------------------------------------------------------------------------
$Id$
vim:expandtab:spell
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