Installation guide

SERVSWITCH™ ULTRA

mouse but don’t disable the mouse either, take these precautions:

• If you never actually use the mouse with the CPU (as would probably be the

case if, for example, the CPU were a Novell

NetWare

file server), either don’t

plug the mouse strand of the CPU Adapter Cable into the CPU’s mouse port,

or don’t load a mouse driver at all. If you do use the mouse, are running

Windows 3.x, and sometimes exit to DOS, make sure you load a DOS mouse

driver before running Windows.

• If you’ve loaded a DOS mouse driver and are going to use an application such

as NetWare that disables the PS/2 mouse, first REM out any statements in your

startup files (AUTOEXEC.BAT, etc.) that load the mouse driver, then reboot

the computer to remove the mouse driver from memory. (Having the mouse

driver unload itself doesn’t do the job.)

4.3.8 S

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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 Ultra 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 Ultra 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.