IDENT		.EQU	$FFFE		; loc of RomWBW HBIOS ident ptr
;
BF_SYSVER	.EQU	$F1		; BIOS: VER function
BF_SYSGET	.EQU	$F8		; HBIOS: SYSGET function
;
BF_SND		.EQU	$50
BF_SNDRESET	.EQU	BF_SND + 0	; RESET SOUND SYSTEM
BF_SNDVOL	.EQU	BF_SND + 1	; REQUEST SOUND VOL - L CONTAINS VOLUME (255 MAX, 0 SILENT) - SCALED AS REQUIRED BY DRIVER (EG: MAPS TO JUST 4 BIT RESOLUTION FOR SN76489)
BF_SNDPRD	.EQU	BF_SND + 2	; REQUEST SOUND PERIOD - HL CONTAINS DRIVER SPECIFIC VALUE
BF_SNDNOTE	.EQU	BF_SND + 3	; REQUEST NOTE - L CONTAINS NOTE - EACH VALUE IS QUARTER NOTE
BF_SNDPLAY	.EQU	BF_SND + 4	; INITIATE THE REQUESTED SOUND COMMAND
BF_SNDQUERY	.EQU	BF_SND + 5	; E IS SUBFUNCTION