Epson PC AX Technical Manual page 207

REV.A
DIAGRAHS AND REFERENCE MATERIALS
+-----------------------------------------------------------------+
I I
I I
: Error code
=
108 :
: 8042 SELF DIAGNOSTIC ERROR :
I I
I I
+-----------------------------------------------------------------+
c. The Read Input Code command is output to the Keyboard
Controller, and the program displays an error message if it
does not assume the "Input buffer empty" status.
The error message is identical to that of Item a. above.
d. The Write Keyboard Controller's Command Byte command is
output tothe Keyboard Controller, and the program displays
an error messageif it does not assume the "Input buffer empty
status.
The error message is as foliows:
+-----------------------------------------------------------------+
I I
I I
: Error code
=
108 :
: 8042 WRI TE COMMAND ERROR :
I I
I I
+-----------------------------------------------------------------+
e. The mode of the Keyboard Controller is reset to the following
modes and this operation is terminated.
PC Compatible Mode
Disable Keyboard
Inhibit Override
System flag
Enable Output-Buffer-Full Interrupt
9) 80826 Instruction Check
The 80826 Instruction check performs a WRITE/READ test on the
System Table Registers IDTR and GDTR as weIl as a SET/RESET test on
the direction flag and interrupt enable flag of the CPU flags.
a. The test data "Oaaaah" is written to and read from IDTR and
GDTR, then their values are checked. The program displays an
error message if the results do not match the initial values.
+-----------------------------------------------------------------+
I I
I I
: Error code
=
113
l
l
80286 INSTRUCTION ERROR :
I I
I I
+-----------------------------------------------------------------+
b. Using the test data "5555h" and "OOOOh", an identical check
is performed.
The error message is identical to that of Item a. above.
7-33