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MiSTer-devel / NES_MiSTer

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Donkey Kong true arcade port homebrew not working #217

Closed birdybro closed 2 years ago

birdybro commented 3 years ago

https://misterfpga.org/viewtopic.php?f=17&t=1271&p=12358#p12358

As mentioned here.

image

Likely culprit could be it being an NROM (Mapper 0) yet having battery backed SRAM, which seems to require an exception in emulators. An example of a similarly configured officially licensed game is 10-yard fight which is NROM PRG-32kb CHR-8kb but no Battery Backed SRAM, and this works.

The Rom's MD5: 9D64596784A288637695D309EA7868C4

greyrogue commented 2 years ago

A full NES 2.0 header works with this game with latest code (it uses the Tepples/Multi-discrete mapper which supports several mappers including mapper 28 and mapper 0 - the one used here): 4E 45 53 1A 02 01 02 08 00 00 70 00 00 00 00 00 This specifies an 8KB Save RAM, which appears to support saving high scores. If saving the RAM isn't meant to be supported, it should be: 4E 45 53 1A 02 01 00 08 00 00 07 00 00 00 00 00

birdybro commented 2 years ago

Confirmed NES 2.0 header works!

The hash for the 2.0 header'd one I used (I converted it using a script and the latest nes20db.xml). CRC32 = 36038D41 MD5 = 82E3BA8A211A99725982423FC6AD035A

https://user-images.githubusercontent.com/16388068/147307239-73aa6b99-94f4-4a4f-871a-7102b1c2c409.mp4