0cf6b0bcb7
switch atari 2600 to new 6502 core
2012-03-24 03:45:47 +00:00
a56ddcdb15
Atari 2600: Modified how memory read/writes are handled, to better emulate the address bus. Cleaned up some comments. Turned off CPU debugging. Added functions to read console switches and player 2 buttons.
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M6532: Mostly re-written, this time based on the datasheet.
TIA: Removed console debug outputs.
2012-03-21 20:28:26 +00:00
5b5932696d
M6532: Added a dedicated cycle count variable to fix a timer issue.
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TIA: Increment the M6532 cycle count when in wsync.
2012-03-21 01:02:24 +00:00
10365ef970
Atari 2600: Implemented the reset button
2012-03-15 06:09:10 +00:00
a55bdd1a69
TIA: Implemented player copy mode 0x06
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M6532: Added an interrupt register
2012-03-14 21:57:10 +00:00
b9a791ab30
Atari 2600: Added support to read UDLR from controller
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M6532: Gives controller data to game program
TIA: Fixed player reflecting error
2012-03-12 21:16:38 +00:00
5e69d7503e
TIA: Added blanking when HMOVE occurs.
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Implemented playfield copying (fixes some Pacman display issues).
Added a document which discusses the inner workings of the TIA on a circuit level.
M6532: Added stubs for several registers, and changed the returns for some. Pitfall's first screen now renders correctly, and the copyright message scrolls.
2012-03-12 18:44:29 +00:00
84a11eacdf
Switched over to using the 6507 to allow for some modifications to the CPU
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MOS6507: now executes instructions on the last cycle. This corrects a syncing issue with the TIA
TIA: added ball data, partially implemented HMOVE, implemented VBLANK
2012-03-11 03:22:44 +00:00
781ab15e1e
Partially implemented the M6532's timer capabilities
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Sketchy implementation of the TIA. But hey, it kind of renders pitfall!
2012-03-10 00:26:54 +00:00
405af35d72
Started work on Atari 2600 core. Added stubs for the TIA and M6532 to be filled in later. Memory map is hard coded, but will only work for basic 4K carts like pitfall. That'll have to be changed later.
2012-03-08 08:12:44 +00:00
zeromus