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CHAPTER 4: Operation
Here’s what can happen: PS/2 type mice send
control data to CPUs in three- or four-byte “packages.”
Sometimes, because of electronic transients, unusual
power-up effects, or plugging and unplugging of cables
from live equipment, the currently selected CPU in a
ServSwitch Spectra system can lose one or two bytes of
this control information. Once that happens, the CPU
still tries to interpret what it sees as normal packages
of data, but it’s always looking at bytes in the wrong
order and from two different packages, so it always
gets it wrong.
To get the CPU back in sync, first try entering a
“Reset Mouse Driver” command (see Section 4.6) if
the CPU is running a recent version of Windows. If that
doesn’t work, enter a “Send Null Byte” command to tell
the Spectra to send a “null byte” to the CPU’s PS/2
mouse port (this has no other effect than getting the
CPU “caught up”). To do this, press and release the left
Control key ([Ctrl]), then press and release [N]. If the
mouse still isn’t right after you issue this command, the
CPU must have been more than one byte out of sync.
Issuing the command once or twice more should do
the trick.
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