NEC CP/M-86 System Reference Manual page 106

Advanced BIOS Functions
6-16
The parameter format is a frequency value followed, optionally, by a number
specifying the tone period.
trl
[n]
The short sound parameters and their corresponding values are defined in Table 6-7.
Table 6-7 Beep Sound Parameters
PARAMETER VALUE
MEANING
Frequency H 710 Hz
I 1202 Hz
J 2038 Hz
K 3406 Hz
Tone period
n
1 20 msec (min)
2 2xl0 msec
3 3xlO msec
N Nxl0 msec
65535 65535xl0 msec
The complete format of the beep command follows.
[control data] [sound parameter] . ..
Both parts of the command are optional, as shown in the following example.
I
P2 K8 Bl H3 ...