PowerPak: Difference between revisions
(NES 2.0 was pretty much finalized by the time I pasted it to this wiki. That doesn't change PowerPak's lack of support though.) |
(→iNES 4 - MMC3 - no wram disable: Full support for the regular old MMC3 would run LGM correctly, but the PowerPak lacks even that.) |
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== iNES 4 - MMC3 - no wram disable == | == iNES 4 - MMC3 - no wram disable == | ||
Older versions of [[MMC3]] would corrupt PRG RAM when turning IRQs on or off because writes to $E000-$FFFF also went to $6000-$7FFF. | |||
''Low G Man'' needs WRAM disabled. There are two ways to disable it, but the PowerPak supports neither. | |||
* ''Low G Man'' disables WRAM during its startup code by writing a value less than $80 to $A001. But the PowerPak's MMC3 ignores $A001 writes entirely as a hack that lets it run ''StarTropics'', whose [[MMC6]] has a different disable method. | |||
* [[NES 2.0]] allows specifying no WRAM at all, but the PowerPak ignores all additional NES 2.0 fields. | |||
== iNES 5 - [[MMC5]] - known bad == | == iNES 5 - [[MMC5]] - known bad == | ||
Revision as of 14:43, 26 February 2014
PowerPak emulates mappers used in NES games, but not always perfectly.
Fixed in Mappers V1.11
iNES 4 - MMC3 - fixed bad irq iNES 9 - MMC2 - fixed bad chr switch iNES 64 - Rambo 1 - mostly fixed bad irq iNES 119 - TQROM (MMC3 + 74HC32) - fixed bad chr switch
iNES 3 - CNROM and clones - limited CHR size
CNROM supports up to four banks (32 KiB) of CHR ROM. PowerPak uses the bank number mod 4. This breaks Panesian games that use a compatible board that supports larger CHR ROMs but is otherwise functionally identical to CNROM.
iNES 4 - MMC3 - no wram disable
Older versions of MMC3 would corrupt PRG RAM when turning IRQs on or off because writes to $E000-$FFFF also went to $6000-$7FFF.
Low G Man needs WRAM disabled. There are two ways to disable it, but the PowerPak supports neither.
- Low G Man disables WRAM during its startup code by writing a value less than $80 to $A001. But the PowerPak's MMC3 ignores $A001 writes entirely as a hack that lets it run StarTropics, whose MMC6 has a different disable method.
- NES 2.0 allows specifying no WRAM at all, but the PowerPak ignores all additional NES 2.0 fields.
iNES 5 - MMC5 - known bad
Games will not start, mapper not complete yet.
iNES 71 - Camerica
Micro Machines has major graphics problems, could be FPGA pins are wrong.
Fire Hawk and Fantastic Adventures of Dizzy show the same problem.
Many of these are very likely bad roms.
