| Atari++ 1.70 released [message #31309] |
Thu, 03 January 2013 08:11 |
Thomas Richter
Messages: 6
Registered: April 2012
Karma: 0
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Junior Member |
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Hi folks,
a new release of Atari++, the portable atari emulator for Linux and
windows has been released on http://www.xl-project.com/ - as usual, you
find there the Linux sources and a compiled version for 32-bit Windows.
There are so many changes this time that it's hard to start, most of
them address defects in the emulation core and not so much in the user
interface. There were quite some changes I would love to add, but my
vacation is about to end in a couple of days and I was wrapping up to
get this release out.
So what's new this time: (long list):
- Priority engine for the "fifth player" generated by missles was
redesigned and should now reproduce all possible cases, including the
priority conflicts correctly.
- Color mixing of the fifth player on top of GTIA modes C0 and 40 should
now work correctly.
- Timing of the GTIA "strange mode" where PF0 to PF3 are used for a
HIRES generated playfield was made more precise.
- Color lookup for GTIA modes C0 and 40 on top of non-HIRES ANTIC modes
was fixed.
- Player-playfield color mixing for GTIA mode 80 was fixed.
- Experimental support for on-line player and missile resizing was added.
- ANTIC display generation was re-designed yet again and was rewritten.
- ANTIC DLI and NMI timing was made a lot more precise and should now
work to the cycle.
- ANTIC VSCROLL support should now work to the cycle.
- ANTIC DMA cycle allocation should now be finally correct for all modes.
- Added emulation for ANTIC forgetting the sync signal if the last line
on the screen is HIRES.
- Added emulation of carrying the DLI and VSCROLL information across
vertical blanks from the last displayed scan-line.
- The jump on vertical blank ANTIC instruction did not generate a DLI on
each line if DLI was enabled. Fixed
- The rather ugly re-generation of ANTIC modelines for character-based
modes was removed. This simplified the design, but might impact the
emulation quality in some corner cases. A new ANTIC design would be
required to fix this. More careful timing in display build-up should
make this unnecessary anyhow.
- DMA border computation is now much more canonical and cleaned up.
- Since a lot of the internal timing should now work "on the cycle",
there is no longer a need to configure some of the ANTIC variables, thus
parts of the ANTIC preferences have been removed.
- CPU emulation includes now parts of the unstable opcode family xB
(opcodes whose lower nibble is B).
- The CPU emulation includes now the emulation of most (if not all) 6502
bugs: Forgetting conflicting NMIs, IRQs and BRKs (!).
Wait-cycle allocation was partially wrong and created conflicts between
memory-refresh cycle allocation and WSYNC requests. This was fixed.
- As a side effect, the special "double WSYNC" check was no longer
necessary and was removed. The emulation is correct anyhow.
- Some CPU preferences were removed because the emulation is considered
to be precise anyhow.
- PIA DDR register reads were not emulated correctly.
- PIA emulation includes now flank-detection on CA2 and CB2 plus
interrupt generation, and thus should be complete.
- POKEY 9 and 17 bit random generators are now emulated precisely, and
the generated "random" numbers should be now identical to those on the
real hardware.
- POKEY two-tone mode should now be emulated correctly, including the
cycle timing for the linked channels.
- Some race conditions for the serial control mode should now be
emulated correctly.
- POKEY direct serial input should now work fine with the SIO emulation,
though direct serial output does not yet work.
- Handling of the POKEY keyboard generation was wrong and should now
work correctly.
- The SIO patch resets now also the audio registers and the IRQ control
of POKEY to work around some software bugs.
- Os++ did not check properly for the RESET bit in the Antic NMI
register and could have triggered false resets under some race conditions.
- The legacy return value for the write-byte bus access was removed as
it was no longer required since a long time.
As always, you can reach me here or better by mail at thor <at> math
<dot> tu-berlin <dot> de.
Greetings and a Happy New Year,
Thomas
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