Casio PV-1000/Emulation: Difference between revisions
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(Created page with "There are two currently-known emulators for the PV-1000. As of 2023 May, both are extremely inaccurate in problematic ways. * MAME * ePV-1000 (Part of Common Source Code emulator system by TAKEDA Toshiya ) [http://takeda-toshiya.my.coocan.jp/pv1000/] Both are problematically inaccurate. Here's a list of what they do wrong: * regF8, F9, FA: square wave channels should be different volumes (fixed in MAME release 254) * regFB: missing mute and ring/XOR modulation support...") |
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* regFF: Neither support more than two pages ($0000 and $2000) of pattern ROM | * regFF: Neither support more than two pages ($0000 and $2000) of pattern ROM | ||
* MAME doesn't emulate BUSREQ/BUSACK slowing down the Z80 at all | * MAME doesn't emulate BUSREQ/BUSACK slowing down the Z80 at all | ||
* Both assume the visible area is 256x192 with a border on the left and right (but instead it's | * Both assume the visible area is 256x192 with a border on the left and right (but instead it's 224x244, with a border on top and bottom) | ||
* Both assume square pixels, but reality is profoundly not square | * Both assume square pixels, but reality is profoundly not square | ||
* Both assume 2KB system RAM is only accessible from $B800-$BFFF | * Both assume 2KB system RAM is only accessible from $B800-$BFFF | ||
None of these should be hard to fix, but haven't been yet. | None of these should be hard to fix, but haven't been yet. | ||
Latest revision as of 03:43, 29 May 2023
There are two currently-known emulators for the PV-1000. As of 2023 May, both are extremely inaccurate in problematic ways.
- MAME
- ePV-1000 (Part of Common Source Code emulator system by TAKEDA Toshiya ) [1]
Both are problematically inaccurate. Here's a list of what they do wrong:
- regF8, F9, FA: square wave channels should be different volumes (fixed in MAME release 254)
- regFB: missing mute and ring/XOR modulation support (fixed in MAME release 254)
- regFC: all IRQs are always enabled and instantly acknowledged
- regFD: Joystick response is instant
- regFE: MAME doesn't support moving the tilemap address at all
- regFE: ePV-1000 uses the wrong address for pattern RAM; MAME doesn't support moving it at all
- regFF: MAME gets the border color red and blue bits backwards; ePV-1000 always emulates the border as black
- regFF: Can't disable rendering
- regFF: Neither support more than two pages ($0000 and $2000) of pattern ROM
- MAME doesn't emulate BUSREQ/BUSACK slowing down the Z80 at all
- Both assume the visible area is 256x192 with a border on the left and right (but instead it's 224x244, with a border on top and bottom)
- Both assume square pixels, but reality is profoundly not square
- Both assume 2KB system RAM is only accessible from $B800-$BFFF
None of these should be hard to fix, but haven't been yet.
