[NES] Polygondwanaland - 2nd Edition (World) (Aftermarket) (Unl) - Green screen at the start

[BenjaminSiskoo]

nightly release on 2024-06-12 16:38:44 UTC

[invertego]

Bad header? MAME has this listed as UXROM, not UNROM-512: https://github.com/mamedev/mame/pull/9504

You could try changing the mapper to 2 using Mesen (Debug -> NES Header Editor).

EDIT: More comments in this thread: https://forums.nesdev.org/viewtopic.php?t=19940&start=90

Correction: Polygondwanaland looks like it has the wrong mapper, as it's too large for UNROM512. Oversized mapper 2? Does anyone know the actual INL board type?

In response to my own question, Polygondwanaland is on an INL-XO-ROM board, based on pics on NoIntro.

[BenjaminSiskoo]

I try to change with mesen 2 but it doesn't work. I can't save the rom.

[invertego]

Is the rom in a .zip file? You may need to extract it first.

[BenjaminSiskoo]

nice catch :) So here the results with Mesen 2 last release :

the original rom :

modified rom to mapper 2 :

It works