Nintendo DMG-01 Manual - Page 127
Set System Color Palette Data $0b
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Game BoyTM CPU Manual 4.5. Commands 8. Set System Color Palette Data ($0b) 9. Enable/Disable Attraction Mode ($0c) 10. Speed Function ($0d) 11. SGB Function ($0e) 12. Super NES WRAM Transfer 1 ($0f) 13. Super NES WRAM Transfer 2 ($10) 14. Controller 2 Request (#11) ($00) - Request 1 play 15. Controller 2 Request (#11) ($01) - Request 2 play Is used to determine if system is SGB or regular GB. 16. Set Program Counter ($12) 17. CharSet Transfer ($13) (%00000xyy) (x=Char Type:0=BG,1=OBJ Range:0=00-7f,1=80-ff) y=CharSet The tiles that are downloaded to the SNES for the border are regular GB tiles that have been modified for extra colors. Every tile consists of 32 bytes. The format is: 16 bytes - Standard 4 color GB character set 16 bytes - Extended color information The same way GB uses two bytes to convey 8 pixels and the 4 colors for each pixel, the extended color by DP Page 127