|
|
The stock CGB boot ROM draws its GAME BOY wordmark from a 192-byte blob
at $0607 (routine $03F0 copies it to VRAM tiles $08-$37: 48 tiles, 4
bytes each, every byte a row doubled vertically). This re-encodes that
blob with a bold-italic SL0PBOY bitmap of the same size and patches it
in place over a local bios/gbc_bios.bin -> bios/sl0pboy_bios.bin. No
code moves; the cart's own Nintendo logo ($104) is untouched so the
integrity check still passes and the boot hands off normally.
bios/ stays gitignored (copyrighted boot ROM); run this to produce the
fork locally. Verified end to end: logo drop + color + chime -> gbos.
|
