Filter
Top Products
42
SERVSWITCH™
4.3.7 S
END
N
ULL
B
YTE
(PS/2 T
YPE
M
ICE
O
NLY
)
PS/2 type mice send control data to CPUs in three-byte increments. 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 system can lose one or two bytes of this control information and get
“out of sync” with the shared mouse. In this situation, the mouse might seem to
refuse to move the pointer or cursor, open windows for no reason, or exhibit other
strange behavior. To get the CPU back in sync, send this command to tell the
ServSwitch 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 issue the Send Null Byte command,
press and release the left Control key, then type [N].
If the mouse still isn’t right after you issue this command, the CPU must have
been two bytes out of sync. Issuing the command again should do the trick.
The CPU will be thrown out of sync if it uses a PS/2 mouse and it’s in sync when
you issue this command. Issue this command two more times to get it back in sync
again. This command has no effect on serial mice, or on CPUs that are not
attached to your ServSwitch system through a PS/2 mouse port.
If you have version 9.01 or higher of the Microsoft mouse driver, the CPU should
never get out of sync. Contact Microsoft if you would like to upgrade your
Microsoft mouse driver.
4.3.8 I
DENTIFY
ROM
Unfortunately, as with all complex equipment, problems might arise with your
ServSwitch that require the assistance of technical-support personnel. One of the
things technicians might want to know when they attempt to diagnose and correct
your problem is the revision level of your Switch’s ROM. This command causes the
ServSwitch to send the four-character “UPxx” ROM level to the currently selected
CPU as ASCII keyboard data; these characters will be echoed back to the shared
monitor if you are at some type of prompt. (You must be at some kind of prompt or
screen capable of displaying typed-in keyboard characters, or you will not see the
Switch’s response.) To issue the Identify ROM command, press and release the left
Control key, then type [I].