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For artistic purposes he's changed the colour of the Display used by Panel to red on black. It looks great, so I thought I'd try it out for real.
While creating a new mask rom isn't going to happen, changing the colour on Memu isn't that hard.
The relevant section of the ROM is:
Code: Select all
3813 .vdpan 3813 21 75 38 LD HL,sc0pan 3816 06 FD LD B,&FD 3818 18 05 JR vdbas2
For red on black screens in Panel change Offset 1816 in the assem rom with a Hex editor to read 06 61 instead of 06 FD and that's it.