[A83] Re: help with sound
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[A83] Re: help with sound
----- Original Message -----
From: "Charlie Adams" <charlie_w_adams@yahoo.com>
To: <assembly-83@lists.ticalc.org>
Sent: Sunday, January 27, 2002 2:12 PM
Subject: [A83] help with sound
oops, i meant until you press 2nd or Clear, enter doesn't work wuth
bcall(_getk)
> ok, i found a sound routine in the old sos lib, but i don't understand how
it works with the frequency. this code beeps until you press enter, but how
does it know what frequency?
> start:
> ld c,69 ;c is the frequency
> ld b,255 ;b is the duration
> beep: di ;disable interrupts
> 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
> bcall(_getk)
> jp z,start
> ret
> .end
> END
>
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