Epson 486SX - Manual (Page 197)

System diagnostics error messages (continued)
Error code Message
Color graphics adapter and CRT
501 Error in adapter check
503 Error in attribute
504 Error in character set check
506 Error in color graphics check
508 Error in screen paging check
509 Error in light pen check
510 Error in color video check
511 Error in sync check
Diskette drive(s) and controller
601
602
603
604
605
606
607
Math coprocessor
701
702
Diskette drive controller error
Sequential seek error
Random seek error
Write error
Read error
Disk change check remove error
Disk change check insert error
703
704
705
706
707
708
709
Coprocessor not installed
Coprocessor initialize error
Coprocessor invalid operation mask error
Coprocessor st field error
Coprocessor comparison error
Coprocessor zero divide mask error
Coprocessor addition error
Coprocessor subtraction error
Coprocessor multiplication error
C-12 Performing System Diagnostics