Epson Y16499100301 - Manual (Page 103)

If there are faulty RAM chips in your system, you see this
message:
xxxx0 201 -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 the computer, this error message is displayed:
301 -Keyboard stuck error
When a number precedes this message, the number
represents the key (in hexadecimal) that is causing the error.
This message may occur after a keyboard reset
(Ctrl Alt Del)
and does not necessarily indicate a problem.
Floppy Disk Drive Seek Check
The computer checks its floppy disk (diskette) drives by
searching the read/write heads for any malfunction. If any seek
errors are found, you see this message:
601 -Diskette error
If this error occurs, confirm that the system diskette is inserted
into drive A. If this number still appears after you insert the
diskette, you may then want to run the System Diagnostics
and select option 6 from the DEVICE LIST. If the error per-
sists, consult your dealer about having the drive repaired.
Power-on Diagnostics C-3