78de49c923
Atari: Added an audio object to the TIA, including functions to run the 4 and 5 bit LFSRs. Also added some code for the first 4 audio modes, enough to generate samples for one of the audio channels.
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Added a logic simulation of some parts of the TIA, including the audio portion. This requires logisim to run.
2012-08-23 02:04:24 +00:00
b599c69c18
Add VirtualWidth to IVideoProvider and the (numerous) implementations. This is just phase 1, client needs to be updated to utilize this information, and some cores (especially PCE) should be updated in a more involved way to provide better TV emulation.
2012-06-25 02:50:34 +00:00
1adec35f93
Atari - implement player 2 button
2012-04-22 00:02:24 +00:00
e41eabcfc3
fix atarihawk video
2012-04-16 22:56:30 +00:00
b5927b1212
Atari M6532: Turned the timer into an object, and now uses a prescaler, replacing the previous 32 bit int implementation.
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Fixed a typo with the interrupt flag.
These changes fix freezes with "Berzerk (1982) (Atari)" and "Omega Race (1983) (CBS Electronics)"
2012-04-04 01:18:41 +00:00
3591f7ca47
Atari: Changed the core to make the TIA the video and sound provider.
2012-04-02 20:55:29 +00:00
74594b961b
Added SyncState functions to the M6532 and TIA.
2012-03-30 02:34:47 +00:00
0cf6b0bcb7
switch atari 2600 to new 6502 core
2012-03-24 03:45:47 +00:00
e708527168
TIA: Implemented missile copying. Also added the missile 1 size which was missing before.
2012-03-22 22:01:20 +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
5e65c7e977
TIA: Removed code for cosmic ark starfield (to be added back later, in a cleaner way). Changed the definition of a frame to start with the first scanline where VSYNC is disabled.
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MOS6507: Fixed a copy-paste mistake with SBC instructions where it would remove another cycle. This fixes the screen bounce issue with pitfall.
2012-03-20 22:45:15 +00:00
63ceeff646
TIA: Fixed a typo breaking ball collisions
2012-03-17 03:28:50 +00:00
b95b3d5a5f
TIA: Added missile graphics. Attempted to make hmove show cosmic ark's starfield correctly, with some luck. Still not correct though. Added collisions.
2012-03-17 03:10:49 +00:00
8afd24a305
New TIA: Moved counter increase into playerdata struct to limit repeated code. Implemented stretched player graphics. Implemented ball graphics (with hmove). Moved hmove data into a struct for better organization.
2012-03-16 18:05:16 +00:00
40ca3e1616
Atari 2600: Turned off sound output until the new TIA is further developed.
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New TIA: Implemented a portion of the TIA using counters. Pitfall's first screen renders correctly.
2012-03-16 07:24:00 +00:00
ef28378dcd
Atari 2600: added stub for the new TIA
2012-03-15 21:08:53 +00:00
d80abfaba5
Atari 2600: renamed TIA to oldTIA in preparation for a new TIA revision
2012-03-15 21:08:00 +00:00
2d94018eaa
Atari 2600: Sketchy implementation of audio output (mode 0x01 only)
2012-03-15 20:34:14 +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
e686660a7c
TIA: Added score graphics. Added support for collisions, and added responses for some collisions. Added support for controller button input. Added another copying mode (0x01: 2 copies close). Fixed a color issue with Pacman.
2012-03-14 20:28:10 +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
c72eef1abc
Atari 2600 TIA: added support for delayed graphics
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sketchily implemented cloning, enough to get pitfall to render
2012-03-11 08:43:45 +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
3e67e78da2
Partially implemented player0 graphics, this time in a more organized fashion
2012-03-10 18:12:12 +00:00
8a73d50e0b
Basic implementation of player 0 graphics
2012-03-10 08:34:04 +00:00
0079d6ade5
Modified the TIA to be cycle based. Improved the rendering of pitfall in the process.
2012-03-10 04:53:23 +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
pjgat09