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Tech Help

Editing A000 to BFFF - Page 1

Editing A000 to BFFF

Posted by: []J.
Date: 2017-04-15 18:20:18
Hi, I'm having some issues making my own ROM in GBZ80, and if anyone was to know the solution, it'd be someone here.

My cart type is 0x13, "MBC3+RAM+BATTERY"

I cannot write to any value between A000 and BFFF, and any read attempts return FF. I've tried toying with a few of the values at FF00+, but that's been proved fruitless. The area is titled SRA0 in BGB and I can't find anything about it online.

Any help would be much appreciated.



Re: Editing A000 to BFFF

Posted by: Yeniaul
Date: 2017-04-15 18:53:06
Attempt writing any byte ending in A to… i think it's ROM (but I may be very, very wrong). It'll unlock SRAM and allow read/write.
EDIT: Write any byte with A as the lower nybble to ROM:0000. I was riiiiiight…

Re: Editing A000 to BFFF

Posted by: []J.
Date: 2017-04-15 19:01:24
Thank you, works like a charm

Re: Editing A000 to BFFF

Posted by: ISSOtm
Date: 2017-04-16 03:35:47
http://gbdev.gg8.se/wiki/articles/MBC3