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Serial port
(RS-232C)
1101
control signal ALWAYS LOW
1101
control signal ALWAYS HIGH
1102
TIMEOUT ERROR
1103
VERIFY ERROR
Alternate
serial port
1201
control signal ALWAYS LOW
1201
control signal ALWAYS HIGH
1202
TIMEOUT ERROR
1203 VERIFY ERROR
Dot-matrix
printer
1401
status
Hard disk drive
and controller
1701
SEEK ERROR
1702
WRITE ERROR
1703
READ ERROR
1704
HEAD ERROR
1705
ERROR DETECTION ERROR
1706
ERROR CORRECTION ERROR
Alternate
gy;llel
port
ERROR PIN p
Performing System Diagnostics
D-31