Nintendo's official GB programming manual recommends sending certain data to the SNES, which is described in section 5.2 Initial Data, as such:
Has anyone looked into what these values are actually used for? Do you really need to transfer them?
Quote:
When writing programs that use the system commands of SGB and SGB2, use the initialization routine of the
game program to send the following 8 packets of default data to the register file.
These are DATA_SND commands that send data to 00:0810-00:0867 which is WRAM. I loaded the SGB and SGB2 ROMs to no$sns (obviously emulating only the SNES side for a quick look). SGB2 had identical values as was suggested in the manual, except a few bytes in the end. On SGB1 instead this memory area was mostly empty. (00FF pattern.)game program to send the following 8 packets of default data to the register file.
Has anyone looked into what these values are actually used for? Do you really need to transfer them?
Code:
DataSnd0::
DB $79,$5D,$08,$00,$0B,$8C,$D0,$F4,$60,$00,$00,$00,$00,$00,$00,$00
DataSnd1::
DB $79,$52,$08,$00,$0B,$A9,$E7,$9F,$01,$C0,$7E,$E8,$E8,$E8,$E8,$E0
DataSnd2::
DB $79,$47,$08,$00,$0B,$C4,$D0,$16,$A5,$CB,$C9,$05,$D0,$10,$A2,$28
DataSnd3::
DB $79,$3C,$08,$00,$0B,$F0,$12,$A5,$C9,$C9,$C8,$D0,$1C,$A5,$CA,$C9
DataSnd4::
DB $79,$31,$08,$00,$0B,$0C,$A5,$CA,$C9,$7E,$D0,$06,$A5,$CB,$C9,$7E
DataSnd5::
DB $79,$26,$08,$00,$0B,$39,$CD,$48,$0C,$D0,$34,$A5,$C9,$C9,$80,$D0
DataSnd6::
DB $79,$1B,$08,$00,$0B,$EA,$EA,$EA,$EA,$EA,$A9,$01,$CD,$4F,$0C,$D0
DataSnd7::
DB $79,$10,$08,$00,$0B,$4C,$20,$08,$EA,$EA,$EA,$EA,$EA,$60,$EA,$EA
DB $79,$5D,$08,$00,$0B,$8C,$D0,$F4,$60,$00,$00,$00,$00,$00,$00,$00
DataSnd1::
DB $79,$52,$08,$00,$0B,$A9,$E7,$9F,$01,$C0,$7E,$E8,$E8,$E8,$E8,$E0
DataSnd2::
DB $79,$47,$08,$00,$0B,$C4,$D0,$16,$A5,$CB,$C9,$05,$D0,$10,$A2,$28
DataSnd3::
DB $79,$3C,$08,$00,$0B,$F0,$12,$A5,$C9,$C9,$C8,$D0,$1C,$A5,$CA,$C9
DataSnd4::
DB $79,$31,$08,$00,$0B,$0C,$A5,$CA,$C9,$7E,$D0,$06,$A5,$CB,$C9,$7E
DataSnd5::
DB $79,$26,$08,$00,$0B,$39,$CD,$48,$0C,$D0,$34,$A5,$C9,$C9,$80,$D0
DataSnd6::
DB $79,$1B,$08,$00,$0B,$EA,$EA,$EA,$EA,$EA,$A9,$01,$CD,$4F,$0C,$D0
DataSnd7::
DB $79,$10,$08,$00,$0B,$4C,$20,$08,$EA,$EA,$EA,$EA,$EA,$60,$EA,$EA