Epson 386SX - Manual (Page 230)

System diagnostics error codes and messages (continued)
Error code Message
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
507 640 x 200 GRAPHICS MODE ERROR
508 SCREEN PAGING ERROR
509 LIGHT PEN ERROR
510 COLOR VIDEO ERROR
Diskette drive(s) and controller
601 DISKETTE DRIVE 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
701 COPROCESSOR 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
Parallel port (printer interface)
901 ERROR PIN p
Serial port (RS-232C port)
1101 control signal ALWAYS LOW
1101 control signal ALWAYS HIGH
1102 TIMEOUT ERROR
1103 VERIFY ERROR
C-38 Performing System Diagnostics