Epson Equity Ie Q50188015-1 - Manual (Page 87)

Clock and CMOS RAM Check
When the system device check is completed successfully, the computer checks
the timer and CMOS RAM. If the system clock has not been set, this
message is displayed:
161-Set date and time
RAM Check
The computer now begins to check the RAM installed in the main system
board. During the check, this message is displayed:
OK
where
XXX
indicates the amount of memory in which no malfunction is
found. This value increases continuously by 64KB up to the amount of
RAM installed on the main board, which is 640KB. If the computer detects
an error in the first 64KB area, an error message is displayed and the
computer halts with no further information.
If there are faulty RAM chips in your system, you see the following message:
20x-Memory error
Keyboard Controller and Keyboard Check
The computer checks the keyboard controller and keyboard for problems such
as failure of one of the keys to release. If there are any errors in the connection
between the keyboard and computer, you see this error message:
301-Keyboard error
Video and Video Controller Check
The computer next checks the video and video controller. If an error occurs,
you see one of these messages:
401-CRT error
501-CRT error
C-2 Power-On Diagnostics