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README.txt
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README.txt
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Port of the A2601 FPGA implementation for the Turbo Chameleon
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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all main components (although they may be slightly out of date).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.