Epson LT - 286e - Manual (Page 43)

640x350 Graphics Test
This test checks the 640x350 graphics display feature of the
EGA display adapter.
This test is available for a color display adapter only.
Video Error Message
DIAG displays the following error message during the Adapter
Test:
DISPLAY MEMORY R/W ERROR
The Adapter Test detected a read/write error in the display
memory. This indicates a problem with the display controller.
Contact your dealer.
Miscellaneous Diagnostics
The tests listed is the Miscellaneous submenu provide a
complete diagnostics check of the parallel and serial ports.
Printer Adapter Test
This test checks the parallel port and the printer by sending a
pattern to the printer. If the printer does not print the pattern,
the test has failed.
38 System Diagnostics