Epson 486SX - Manual (Page 194)

System diagnostics tests (continued)
Device
Monochrome
display adapter
and CRT
Tests available Description
Adapter check Tests all types of
Attribute check monochrome monitors
Character set check
Graphics mode check
Screen paging check
Video check
Sync check
Run all above checks
Color graphics
adapter and CRT
Adapter check
Attribute check
Character set check
Graphics mode check
Screen paging check
Light pen check
Video check
Sync check
Run all above checks
Tests all types of color
monitors
Diskette drive(s) and Sequential seek check Tests operation of the
controller Random seek check diskette drive(s):
Write, read check requires a formatted
Disk change check diskette for some tests
Run all above checks
Math coprocessor Tests the operation of
the math coprocessor
Parallel port (printer
interface) Tests the primary
parallel port: requires a
loop-back connector
(contact your dealer)
Serial port (RS-232C) Tests the primary serial
port; requires a
loop-back connector
(contact your dealer)
Alternate serial port Tests the secondary
serial port; similar to
primary serial port test
Performing
System Diagnostics C-9