Epson 10020 User Manual

Before running any tests, the computer checks 

DIP switch 1-Z

on the front panel to ensure that a coprocessor is installed. If

the coprocessor is missing, or if you have not set 

DIP switch 1-2

correctly, 

an error occurs and the test ends.

The program then runs a series of checks to test the precision

with which the coprocessor performs calculations and to detect
whether it correctly handles exceptions. The program reports

any errors that occur.

Use this option to test the operation of the secondary parallel

printer port. For example, you would select this option to test

the built-in port if you have assigned it as the secondary port, or

if you have installed an option card that provides a parallel port.

To perform the test, you must insert a special loop-back

connector into the parallel port so that the computer can check
the individual pins of the port. Contact your Customer Care

Center if you need a loop-back connector (or see Appendix B
for signal/pin assignments to make your own loop-back

connector). Note that a different connector is required co test

the serial port.

When you select option 9 from the DEVICE LIST, you see

these prompts:

Attach loop-back 

connector to 

parallel 

port.

Enter Y to start this check when connector

is attached, or Enter N to return to the

menu.

Insert the loop-back connector. Then press Y and Enter to

start the check.

Performing System Diagnostics

D-27