Epson PC AX Technical Manual page 135

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4.3 RESPONSE AND INFORMATION FOR ERRORS
4.3.1 Outline
The power on diagnostics (called POD) of EQUITY 111+ / EPSON PC AX ROM BIOS
diagnoses the system status held when EQUITY 111+ / EPSON PC AX is initiated
and takes action according to the status.
4.3.2 POD Functions
POD has the following four functions:
1; POD halts the system to disable initiation if POD detects a serious error
while checking system hardware.
2; If POD detects an error that is not fatal to the system, POD displays the
error message on the CRT screen and 1/0 address 80H. Then makes the system
wait for initiation until a specific key is pressed.
3; If a serious error occurs (refer to function 1), POD displays an error
message on the CRT screen in addition to 1/0 address 80H.
4; In reference to a non fatal error (function 2), POD skips the specific key
input wait status.
4.3.3 Explanation of the POD Functions
1; Checking system hardware (serious error)
See the table 4-2. (Responses and information for errors)
2; Checking system hardware (not fatal)
See the table 4-2. (Responses and information for errors)
The specific key is the F1 key.
3; Displaying an error message on the CRT screen and 1/0 address 80H.
See the table 4-2. (Responses and information for errors)
4; Skipping specific key input wait status
The key input wait request for an error specified in CMOS RAM 3EH and 3FH is
skipped if a specific pattern is defined in CMOS RAM 34H to 3DH.
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