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SERVSWITCH™ SPECTRA
Appendix C:
Commands for Advanced Users
C.1 Set Keyboard Mode
Some CPUs might require you to set the ServSwitch
Spectra to output a different keyboard mode than usual.
Keyboard “modes” are electrical signaling protocols that
determine how a powered CPU and keyboard interact.
A CPU and keyboard must use the same mode in order
to work with each other. Of the three standard keyboard
modes currently in use, mode number 2 is the one used
by the vast majority of CPUs. It is also the default state
of all 101-key and PS/2 keyboards. Mode 1 is used
primarily by certain PS/2 CPUs. Mode 3 is used by
some servers and UNIX workstations.
The ServSwitch Spectra supports all three of these
modes and translates between them. As it receives
signals from your keyboard, it sends them to the
currently selected CPU while emulating a keyboard of
the appropriate mode for that CPU. As it receives signals
for the keyboard from the currently selected or scanned
CPU, it sends them to the keyboard while emulating a
CPU of the appropriate mode.
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