HP Vectra Technical Reference Manual page 198

Command Type Description
OF4H
SNGL Enable. This command enables keyboard action. The keyboard
will issue an 'ACK' response, then begin sending scancodes as
keys are pressed.
OFSH
SNGL Default Disable. This command sets the keyboard parameters to
their power-on default state and disables the transmission of
scancodes. The keyboard will send an 'ACK' response to this
command.
OF6H
SNGL Set Default. This command sets the keyboard parameters to
their power-on state and sends an 'ACK' response. the keyboard
will continue to transmit scancodes after receipt of this
command.
OF7H-OFDH
SNGL No Operation (NOP). These codes are reserved for future use.
The keyboard will acknowledge these codes, but no other action
will be performed.
OFEH
SNGL
Resend. This command may be sent to the keyboard whenever
an error is detected by the system. This command must be sent
before the next scancode is to be transmitted. If the last code
sent by the keyboard was a Resend command, the keyboard will
send the prior code.
OFFH
SNGL This command instructs the keyboard to perform its Power-On
Reset function. This step takes at least 300 milliseconds, during
which the keyboard is disabled.
Keyboard 189