Z80 Routines:Sound:Beep
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Revision as of 04:40, 13 July 2005 by Guillaumeh (Talk | contribs)
By Joe Wingbermuehle (joewing@calc.org). This routine was written for the ZLib library for the SOS
shell.
;---------= Make a sound =---------
; c=frequency, b=duration
beep: di
ld e,$D0
beepl1: ld a,c
beepl2: dec a
jr nz,beepl2
ld a,e
xor %00000011
ld e,a
out (0),a
djnz beepl1
ei
ret
