atari++ 1.71
- grzeniu @ 16.1.2013 @ 18:14
Po kilkudniowej przerwie możemy zacząć testować następne wydanie atari++, w którym zmiany obejmują:
- The ANTIC logic to roll over an instruction to the next scan was partially broken and also rolled a Jump on Vertical Blank over, breaking some games that played tricks with the DMA control register
- The new CPU logic to fetch the wrong interrupt vector (NMI instead of IRQ) was partially broken and forgot to fetch the right high-bit, potentially breaking code
- The 65C02 BRK instruction was emulated incorrectly. The NMOS version worked fine, and continues to work fine
- 1.70 had, as indicated, a regression for late writes on Antic CHARCTL that broke at least one game (Summer Games). The corresponding logic has been re-done in a much cleaner way and is now part of 1.71
- Pokey lo-byte timer registers in a 16-bit timer pair did not underrun to 255 correctly. In fact, the timer emulation was partially re-done and should now do correctly, including the relative offset of low and high-timer on a STIMER resynchronization
- GTIA priority logic for player 4 on top of playfield 0/1 was broken in one priority selection, which got fixed now
- Player/missile retriggering was partially incorrect. This has been fixed now
- Player/missile resizing was, as stated, experimental in 1.70 and is now implemented correctly
- On-line player-missile shape changes are now experimentally supported
- The ANTIC/CPU WSYNC logic was partially broken as it does not block writes, only reads - the mechanism is a different one. Note that this only holds for the NMOS version. The CMOS version works correctly. This is also emulated
- The NMI/IRQ reaction times were short by one cycle. They are now 7 cycles as indicated
- GTIA mode 80 on top of a low-res screen created a wrong color for the PF3:BK pixel combination. This got fixed
- GTIA VDelay support was partially broken. Actually, the P/M DMA engine was redesigned for this release and should now work correctly
- Alsa sound support was broken on some hardware. For some Alsa drivers, audio hardware reacts allergic when trying to fill more samples into the available buffer, stalling the main program. The updated Alsa sound suport rounds the samples written to the Alsa buffer to entire fragment sizes avoiding this problem. The SDL or Oss/HQOss drivers were not affected, though in general Alsa is preferably.
Binaria (Windows) oraz źródła (Linux) pobieramy ze strony projektu.
