Epson Apex 20020 - Manual (Page 199)

Error code Message
Keyboard
301 8042 ERROR
301 KEYBOARD ERROR
302 KEYBOARD IS NON-STANDARD OR DEFECTIVE
303 KEYBOARD LOCKING ERROR
Monochrome display adapter and CRT
401 V-RAM ERROR
402 VIDEO SIGNAL ERROR
403 ATTRIBUTE ERROR
404 CHARACTER SET ERROR
Color graphics adapter and CRT
501 V-RAM ERROR
503 ATTRIBUTE ERROR
504 CHARACTER SET ERROR
505 40-COLUMN CHARACTER SET ERROR
506 COLOR GRAPHICS ERROR
507 640X200 GRAPHICS MODE ERROR
508 SCREEN PAGING ERROR
509 LIGHT PEN ERROR
510 COLOR VIDEO ERROR
Floppy disk drives and controller
601 FLOPPY DISK CONTROLLER ERROR
602 SEQUENTIAL SEEK ERROR
603 RANDOM SEEK ERROR
604 WRITE ERROR
605 READ ERROR
606 DISK CHANGE CHECK REMOVE ERROR
607 DISK CHANGE CHECK INSERT ERROR
Math coprocessor (80287)
701 NOT INSTALLED
702 COPROCESSOR INITIALIZE ERROR
703 COPROCESSOR INVALID OPERATION MASK ERROR
704 COPROCESSOR ST FIELD ERROR
705 COPROCESSOR COMPARISON ERROR
706 COPROCESSOR ZERO DIVIDE MASK ERROR
707 COPROCESSOR ADDITION ERROR ’
708 COPROCESSOR SUBTRACTION ERROR
709 COPROCESSOR MULTIPLICATION ERROR
710 COPROCESSOR PRECISION ERROR
Performing System Diagnostics C-35