Homebrew NES port of the arcade version of Donkey Kong

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TLPD-AVW
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Homebrew NES port of the arcade version of Donkey Kong

Unread post by TLPD-AVW »



Currently the rom demonstrated in this video fails to boot on MiSTer, only showing a black screen. From my understanding it uses NROM (mapper 0) with battery save function - is such combination even supported by MiSTer? I thought that it could be related to iNES header providing insufficient information, but changing it to NES 2.0 format with 8kb save RAM defined did nothing.

I understand that the existence of the arcade original's core makes the support of this version unnecessary, but it would be neat if this port worked on the NES core.
rcade
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Re: Homebrew NES port of the arcade version of Donkey Kong

Unread post by rcade »

I'm almost positive I have played this on my MiSTer... even recently.
rcade
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Re: Homebrew NES port of the arcade version of Donkey Kong

Unread post by rcade »

I was wrong- it doesn't work. I must have been playing on Everdrive and a real NES when I played it last.
lupin3rd
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Re: Homebrew NES port of the arcade version of Donkey Kong

Unread post by lupin3rd »

Thread necromancy!

Was support for this ever added?

If I'm not mistaken, there were no NROM games that supported battery-backed SRAM. So that means this game runs on a "custom" mapper, even though the concepts are well-known (NROM and Save Support). Emulators have to have mappers defined and emulated in the emulator itself, because ROMs alone do not contain the logical functions that an actual cartridge would physically supply. Support could be added, but if people are making homebrew stuff that they want to be playable on all NES systems/emulators/FPGAs, they should really use a well-known supported mapper from the outset.
aberu
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Re: Homebrew NES port of the arcade version of Donkey Kong

Unread post by aberu »

The MiSTer NES core has had many custom mapper configs for homebrew added to it, so this probably wouldn't be impossible or unlikely for it to be fixed. I'll test this out in a sec with both the latest build and with current release.

EDIT: Just confirmed this still doesn't load. Image attached is the rom I used, just in case it matches or not. I think you are right, the fact it uses Battery Backed SRAM with NROM 0 mapping in a custom config might be the issue.
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