Using the SSG sound channels
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.org $8 push af ;Set YM2610 "Port A" register D to value E ld a, d out (4), a ld a, e out (5), a pop af
FastBeep: ld de, 0040h ;Channel 1 frequency: 2kHz rst 08h ld de, 0100h rst 08h ld de, 0B0Fh ;EG period: $50F rst 08h ld de, 0C05h rst 08h ld de, 0810h ;Channel's 1 amplitude is tied to the EG rst 08h ld de, 0D08h ;EG shape: Repetitive ramp down rst 08h ld de, 070Eh ;All channels except 1 are off rst 08h ret
SSG_Silence: ld de, 0800h ;SSG channel 1 volume = 0 rst 08h ld de, 0900h ;SSG channel 2 volume = 0 rst 08h ld de, 0A00h ;SSG channel 3 volume = 0 rst 08h ld de, 070Fh ;Disable all channels rst 08h ret