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Amiga Magazin: Amiga-CD 1997 November & December
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Amiga-CD 1997 #11-12.iso
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aminet
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v2600
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v2600.readme
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Amiga Virtual 2600 (v2600), An Atari 2600 Emulator
==================================================
Amiga version 0.8. This is BETA software. Please report any bugs.
DESCRIPTION
===========
Amiga Virtual 2600 is an emulation of the Atari 2600 video game system,
otherwise known as the Atari VCS, or Video Computer System. It can take
cartridge ROMs as .bin binary images (2K or 4K), Commodore .prg format
files, Activision Action Pack .bin files, and the new .c26 Common 2600 file
format files. It uses regular Amiga joysticks, and can use the mouse to
emulate paddles. Many existing Atari 2600 cartridges can be used with this
emulator. Even sound is supported, more or less...
REQUIREMENTS
============
Any fast Amiga, 020 or better, OS 3.0 or better.
Fast RAM recommended.
The faster the Amiga, the better.
Atari 2600 ROMs
USAGE
=====
Double-click on the v2600 icon to bring up the window. The Command Line
Interface has been removed. Too bad, eh? ;^)
Load ROM
Click on the "Load ROM" button to bring up a file requester. It will only
display files that are valid with v2600. When you select a ROM, the
filename and path will be shown in the box next to the "Load ROM" button.
You can just type in the name of a ROM you want to load in this box if you
don't care to use the file requester. Be careful what you load, since
there is no way to thoroughly check that you are using a real Atari ROM.
Loading other files will most likely crash your computer.
Refresh Rate
This will set how often the screen will be updated. For example, if you
set the Refresh Rate to 2, it will only refresh every-other-frame. This
can speed up the graphics rendering, but can also cause some games to look
pretty bad.
System Type
This will allow you to emulate either a PAL or NTSC Atari. This is not
fully functional at this time.
Left Controller
Right Controller
Paddle Control
This allows you to select what type of controller the left and right
players will use. If you select "Joystick", then a standard Amiga joystick
may be used. In case you didn't already know, Amiga joysticks are
compatible with Atari joysticks, so you can use the original Atari
joysticks for a really authentic (not to mention uncomfortable) experience.
The "Left Controller", which is used by "Player 1" in most games, uses the
joystick port (Port 1) on your Amiga. To use the "Right Controller", you
must remove your mouse from the mouse port (Port 0), and replace it with a
joystick. If you want to play a paddle game, you can change to "Paddle".
The Amiga mouse is used to emulate an Atari paddle. Real Atari paddles are
not supported at this time. If you set the "Paddle Control" to "Use Mouse
X", then you can move the mouse left and right (along the X-axis) to
emulate a paddle. If you change the "Paddle Control" to "Use Mouse Y",
then you can move the mouse up and down (along the Y-axis) to emulate a
paddle. Atari racing paddles and keyboard controllers are not supported at
this time.
Bank Switching
The Atari could only address about 6k from a cartridge ROM, so for games
requiring more memory, special hardware is used to "switch banks" of ROM
memory. Since this is done with hardware, emulating this can be tricky,
because there is no way to determine if a ROM requires this. It was up to
the game manufacturer to decide what type of bank switching hardware they
wanted to use. Thankfully there were a few companies that stuck with a
standard chip. The bank switching schemes emulated are Atari 8k, for most
8k Atari-manufactured ROMs, Atari 16k for most 16k Atari-manufactured ROMs,
Parker 8k for most 8k Parker-Brothers-manufactured ROMs, CBS for most
CBS-manufactured ROMs, and Atari Super Chip for Atari-manufactured ROMs
that use it. If the ROM you want to play is 6k or less, you can most
likely choose NONE for no banking, since it's not necessary for small ROMs.
It's a guessing game for other ROMs, though. Unfortunately, large
Activision ROMs are not yet supported. Currently, bank switching is fairly
unstable.
Video Output
This allows you to select the video mode of the emulator. "Custom Screen"
opens a new screen and uses a custom CPU-only chunky-to-planar routine.
"Window" will open a window on your Workbench screen. It uses the
WritePixelArray8() chunky-to-planar routine. This is included for graphics
card users. The more colors your Workbench can display, the better. The
last one is "Fast & Ugly". This opens a new screen and uses a custom CPU
and Blitter chunky-to-planar routine. This will be faster on slow
machines, but there is a lot of flicker. Video output will be improved in
the future.
Sound Output
If you check this box, Atari sound will be emulated. This will slow down
the emulator considerably, so only use it if you have a really beefy
machine. Only pure sounds are supported. White noise (used in explosions
and other sound effects) is not. This may be improved in the future.
Start
Press the "Start" button to play the selected ROM. If you haven't selected
a ROM, the "Start" button will be "greyed-out", and won't function.
KEYBOARD CONTROL
================
For the sake of faster emulation and cleaner code, keyboard emulation of
the joystick has been removed. It will only be added if there is a big
demand for it.
CONSOLE SWITCHES
================
The Atari 2600 has several switches on the console which perform various
functions. The keyboard equivalents are:
F1 or R Reset
F2 or S Select
F3 or B Color/BW
F4 Left Player Amateur (B on some Ataris)
F5 Left Player Pro (A on some Ataris)
F6 Right Player Amateur (B on some Ataris)
F7 Right Player Pro (A on some Ataris)
ESC or F10 Quit
COPY POLICY
===========
The original Virtual 2600 is copyright 1995/96 Alex Hornby.
Amiga Virtual 2600 is copyright 1997 Matthew Stroup.
Virtual 2600 is free software distributed under the terms of the GNU
General Public License. This means that the source code needs to be
available. To cut down on archive size, I will make the source available
on my web page in a separate archive.
AUTHORS
=======
Amiga Virtual 2600:
Matthew Stroup
stroupm@jps.net
http://www.jps.net/stroupm/v2600.htm
When I saw that the Virtual 2600 code was available to be ported, I thought
it would be a challenging project. It runs about 4 fps on my 50MHz 68030.
Both my code and Alex Hornby's original code are in beta stages. Later
versions will probably be faster. I'm using chunky to planar conversions
that I found on Aminet by unknown authors. Amiga v2600 was compiled using
SAS/C 6.57. All source for the Amiga version is available on my web page,
as per the GNU public license. To get the original source code, or source
code for other platforms, check the Virtual 2600 home page.
Original Virtual 2600:
Alex Hornby
ahornby@zetnet.co.uk
http://www.users.zetnet.co.uk/ahornby/v2600.html
The original Virtual 2600 is the result of Alex Hornby's 3rd year
university project. His aim is to preserve old computer games that would
otherwise be lost to the world.
IMPORTANT NOTES
===============
Please don't e-mail me asking for ROMs, because I won't give them to you.
Anyone can find them by using Alta Vista or any another web search tool. I
highly recommend only getting the ROMs that you actually own. Doing
otherwise can be copyright infringement. I have included a freeware game,
OkieDokie, with the permission of Bob Colbert and Retroware.
If you have any comments, suggestions, or bug reports, please send me
e-mail at stroupm@jps.net. I'll try to get back to you as soon as
possible. I no longer receive e-mail at stroupm@inreach.com. I can still
receive e-mail at stroupm@csus.edu, but this will change when I finish
school at the end of the year (1997), so use stroupm@jps.net.
If a game doesn't seem to be working, it's probably because you selected
the wrong banking type. It is possible that your memory is getting
trashed, and v2600 may freeze up, requiring a reset. This is apparently
caused by faulty bank switching, which has been noted by the original
author. I have not, however, had any Enforcer hits. It would be a good
idea to reset your Amiga after using v2600, though, and don't do anything
important in the background. You've been warned! ;^)
TO DO
=====
* Support for real Atari paddles.
* Support (real or emulated) for Atari racing controllers.
* Support (real or emulated) for Atari keyboard controllers.
* Faster graphics. Kill chunky-to-planar if possible.
* Support for large Activision games.
* Implement full-length PAL screens.
* Allow user-selected screen modes.
* Improve sound emulation.
* Eliminate hardware banging for future compatibility.