Epson 10020 - Manual (Page 194)

Error code Message
Floppy disk
drives and controller
601
FLOPPY DISK CONTROLLER ERROR
602 SEOUENTIAL SEEK ERROR
603 RANDOM SEEK ERROR
604 WRITE ERROR
605 READ ERROR
Math coprocessor (8087-1)
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
901 ERROR PIN p
Parallel port on video adapter
8101 ERROR PIN p
Serial port (RS-232C)
1101 ERROR DTR DSR, DSR ALWAYS HIGH/LOW
1101 ERROR RTS CTS. CTS ALWAYS HIGH/LOW
1102 TIMEOUT ERROR
1103 VERIFY ERROR
Alternate serial port
1201 ERROR DTR DSR, DSR ALWAYS HIGH/LOW
1201
ERROR RTS CTS, CTS ALWAYS HIGH/LOW
1202 TIMEOUT ERROR
1203 VERIFY ERROR
Dot-matrix printer
1401 status: error-type
Performing System Diagnostics D-37