Control Data Corporation CDC CC63X Hardware Maintenance Manual page 59

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• Indicator Test - The eight indicators that are controlled
by the firmware will be stepped on and off at the rate of
one-half second. After the first indicator is lit, every
one-half second it will be shifted right. After the last
indicator has been lit one-half second, the first will
again be lit.
• Touch-Panel Test - The touch-panel interrupt will be
enabled. When the screen is touched, an interrupt occurs
and the cursor will be moved to the area touched.
• External Loopback - A message displays near the bottom of
the screen describing how to run external loopback. It
displays: TO RUN EXTERNAL LOOPBACK - ENABLE TEST SWITCH.
When the TEST switch on the rear panel is pulled out:
• The UART clock for the keyboard I/F will be tested and
the message KBD CLOCK OK or KBD CLOCK FAIL will be
displayed.
• PARALLEL PORT - If a parallel-interface graphics
printer is installed, a 55 hexadecimal and AA hexa-
decimal are sent to the printer, which is conditioned
to echo the data. If incorrect data· or no response is
received, the .error message PARALLEL PORT FAIL is dis-
played and no further testing occurs on the port. If
no error is detected, the message PARALLEL PORT OK is
displayed. The graphics printer must be powered on
(terminator power also on) for approximately 20
seconds before pulling out the TEST switch or an
Invalid error will occur.
• If a parallel-interface graphics printer is not
installed, a test is made for the presence of a
flexible disk drive. The test consists of sending a
read ID to the disk drive. If an improper status is
received, the message PARALLEL PORT FAIL is
displayed. If proper status is received, the message
PARALLEL PORT OK is displayed. The primary disk drive
involved in the test must have a disk installed or an
invalid error will occur.
• KEYBOARD LOOPBACK - The message KEYBOARD RUNNING will
be displayed. A total of 128 characters from 00
hexadecimal to 7F hexadecimal will continuously be
looped back. If an error occurs, the word RUNNING
will change to FAIL.
• COMMUNICATIONS LOOPBACK - The message COMM RUNNING
will be displayed. A total of 128 characters from 00
hexadecimal to 7F hexadecimal will continuously be
looped back. If an error occurs, the word RUNNING
will change to FAIL.
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