Tandy 1000 SL Technical Reference Manual page 566

BIOS Services
Output Sound
Outputs sound to the speaker.
Entry Conditions
AH
=
83H:
Output sound (to the speaker)
ES:BX
=
buffer address
CX
=
buffer length
DX
AL
Exit Conditions
Not Busy:
AH
=
0
CF
=
0
Busy:
AH
=
0
CF
=
1
=
transfer rate (1-4095, where 1 is the fastest
=
volume (0-7, where 0
=
no sound)
transfer rate)
Stop Sound Input and Output
Stops sound input and output.
Entry Conditions
AH
=
84H
Notes: The transfer rate values in register DX are not the same
for calls AH
=
82H and AH
=
83H. To input a buffer of data with
the AH
=
82H call with a given DX value, then play it back with
the AH =83H call so that it sounds the same, set the DX value
for output approximately 11.5 times as large as the DX value for
input when run on a Tandy 1000 SL and approximately 10.0 times
faster on a Tandy 1000 TL.
45.