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Once again, if any data received does nor march the data a
verify error occurs, and the computer reports the transmitted
and received data at the rime of the error.
Alternate Serial Port Check
If you have turned on DIP switch 4 on the back panel,
select option 12 to test the serial communications (RS-232C)
port. To perform the test you must insert a special loop-back
connector into the alternate serial port so that the computer
can check individual pins of the port. This test is identical to
the check for the primary serial port. For derails, see the
description of the Serial port (RS-232C) check above.
Dot-matrix Printer Check
Use this option to check:
l
The operation of your printer in IBM-compatibility mode
l
The compatibility of your printer with the extended
character set your computer uses
l
The ability of your printer to produce dot graphics and
print images of the graphics screen.
When you select option 14 from the DEVICE LIST, you
see this prompt:
Is dot-matrix printer on-line (Y/N)?
Check that your printer is connected to the computer, and
that it is turned on, loaded with paper, and on-line. Press Y
and then Enter to continue, or press N and Enter to return to
the menu.
When you continue the test, the computer checks that the
printer is responding correctly. This test detects whether the
printer is off-line or whether an interface error exists. If no
errors occur, the computer sends a repeating sequence of ASCII
characters and dot graphics data to the printer until you press
any key.
Performing System Diagnostics
D-19