Epson PC AX Technical Manual page 215

REV .A DIAGRAKS AND REFERENCE MATERIALS
3. Keyboard Check
This module checks the operating status of the keyboard as well
as the input of each key. The remainder of this section describes
the checking procedures.
(In case of test multiple times, only keyboard function check is
performed.)
1) Keyboard Function Check
a. The keyboard is read without pressing any keys, and the
program displays an error message if the input status is not
empty.
+-----------------------------------------------------------------+
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: Error code
=
301
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: 8042 ERROR :
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+-----------------------------------------------------------------+
b. The self-test command is output to the keyboard. The program
displays an error message if the Normal Termination code is
not returned.
+-----------------------------------------------------------------+
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: Error code
=
301 :
: 8042 ERROR :
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+-----------------------------------------------------------------+
c. The interface test command is output to the keyboard. The
program displays an error message if the Normal Termination
code is not returned.
+-----------------------------------------------------------------+
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: Error code
=
301 :
: KEYBOARD ERROR :
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+-----------------------------------------------------------------+
d. The keyboard functions are disabled, then the response from
the keyboard is checked. The program displays an error
message if the keyboard is in data ON status with the keyboard
clock in OFF status. The error message is identical to that
of Item c.
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