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Advanced BIOS Functions
Sound Beep
ENTRY
CL: 03H
AX: Buffer
length
DS:DX: Data
Buffer Address
RETURN
EXT FUNC 3
SOUND BEEP
The Sound Beep function sounds the beep tone on the APC. The 110 buffer
addressed by registers DS and DX contains beep data. Register AX is set to the 1/0
buffer length in bytes. Beep data consists of control commands and parameters.
Control commands set the loudness and type of sound. The parameters control
frequency and tone period.
Control data is written in the following format.
The loudness parameter,n, is optional. Table 6-6 lists the values for n. Control data
is effective until the next control data is specified. Band P are mutually exclusive
commands. They cannot be specified together.
Table 6-6 Short Sound Control Commands
COMMAND
FUNCTION
Bn
B
=
Rectangular wave sound (beep)
Pn
P
=
Piano sound
n
=
Loudness
1 piano
2 medium (default)
3 forte
6-15
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