A2601 FPGA implementation for the Turbo Chameleon
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README.txt

Port of the A2601 FPGA implementation for the MiST
---------------------------------------------------------------------------------

Buttons:
- right MiST button -> Start
- Keyboard 1        -> Select
- Keyboard 2        -> BW/Color (yellow led on = Color)
- Keyboard F12      -> OSD to select roms from the sd card (needs extension .a26)

Current limitations:
- Supports only the common Atari bank switching schemes (F4, F6, F8, E0, 3F, FE)
- No illegal opcodes
- F4, F6, F8 bank switch types are auto-detected by the ROM file size. E0, 3F, FE
  is auto-detected by the file extension, e.g. revenge_of_monezuma.e0 or
  decathlon.fe will work


Supports mist.ini "scandouble_disable" for RGB 15khz output, or just hold the 
middle MiST button to switch between modes. Also support YPbPr output via the
ypbpr=1 mist.ini optioon.

All MiST related files including the Quartus project files are in the 'mist' subdirectory.

Homepage: http://ws0.org/tag/ma2601/

Original readme below :)




Port of the A2601 FPGA implementation for the Turbo Chameleon
---------------------------------------------------------------------------------

The ROM cartridge is the GPL licensed game Hunchy, see
http://www.atariage.com/forums/topic/67953-hunchy-my-first-2600-homebrew-game/
converted to hex file format with 
http://www.ht-lab.com/freeutils/bin2hex/bin2hex.html

Copyright 2012 Frank Buss


Original readme:


A2601: An FPGA-based clone of the Atari 2600 video game console (Release 0.1.0)
---------------------------------------------------------------------------------

This archive contains source code for VHDL implementation and Python script 
utilities for the A2601 video game console project.

VHDL source code provided includes implementation of the 6502(7) CPU, the TIA, 
the 6532 RIOT, additional audio/video/joypad circuitry and bankswitching schemes 
plus additional RAM used by some game cartridges. Test benches are supplied for 
all main components (although they may be slightly out of date).

The 6502 CPU core has been developed from scratch for this project. It contains 
hand-crafted finite state machine and controls that implement all documented 
6502 opcodes. It synthesizes quickly and has good performance in the simulator. 

The TIA implementation digitally synthesizes NTSC composite video signal via a 
lookup table that contains a sequence of values that signifies a sine wave at 
correct phase for each one of the 16 chrominance values selectable in the TIA. 

You should be able to synthesize the A2601 in Xilinx ISE without any major 
problems. No project files are included, but it is best to create these 
yourself, anyway. Two top level entities are provided: One reads cartridge ROM 
data from on-board flash memory, the other stores the ROM data in the FPGA 
built-in SRAM. It is also possible to run A2601 sources in a VHDL simulator. 
Some helper utilities and a test bench are provided for this purpose in the 
A2601/util directory.

For more information, visit the project website at 
<http://retromaster.wordpress.com/a2601>.

All source code and other content found in this archive is subject to GNU 
General Public License Version 3. See the included LICENSE.TXT file for details.

Copyright 2006, 2007, 2010 Retromaster.