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CHAPTER 6: Troubleshooting
6.2.2 Y
OU
C
AN
’
T
S
WITCH
P
ORTS FROM THE
K
EYBOARD
A. Can you do anything from the keyboard? If not, the keyboard strand of your
MKM cable has probably come loose. Reconnect it.
B. The ServSwitch might have lost power for less than three seconds. (This can
cause the keyboard to lock up.) Disconnect the keyboard and plug it back in.
C. For IBM and multiplatform models, the keyboard mode that the currently
selected CPU port is set for might not match the mode that the CPU on that port
expects. Issue the Set Keyboard/Mouse command to change the port’s mode (see
Section 4.3.7). Sometimes this situation can confuse the CPU or keyboard so badly
that it is necessary to reboot the CPU or to reset the keyboard by unplugging it and
plugging it back in.
D. For PS/2 type equipment, if the keyboard and mouse strands of either the CPU
cable or the MKM cable have been reversed, plug them into the proper ports.
E. You might be using the keyboard incorrectly. Make sure to use the left Control
key to start port-switching commands. Make sure to use the numeric keys at the top
of the keyboard rather than the numeric keypad when you type in port numbers.
Make sure to release the Control key before you start typing in a port number.
Make sure you don’t wait too long before you enter a port number. Make sure you
don’t accidentally hit keys such as Shift, Caps Lock, or Alt.
6.2.3 C
HARACTERS
T
HAT
Y
OU
T
YPE
C
OME
U
P
W
RONG OR
M
ISSING
(IBM
AND
M
ULTIPLATFORM
M
ODELS
O
NLY
)
The keyboard mode that the currently selected CPU port is set for might not match
the mode that the CPU on that port expects. See item C under Section 6.2.2.
6.2.4 Y
OU
C
AN
’
T
S
EEM TO
S
CAN OR
S
WITCH TO
C
ERTAIN
P
ORTS AT
A
LL
A. The Maximum Ports setting is too low. (If any of the CPUs you can access are
receiving garbage characters, this is a good indicator.) Set Maximum Ports to
match the number of CPUs in your system (see Section 4.3.8).
B. The Width and/or Units setting is wrong. To reach all ports, set Units equal to
the number of submasters in your system, and Width equal to the greatest number
of CPUs you have on any submaster (see Sections 4.3.9 and 4.3.10).