Epson 486SX User Manual page 41

Note
If you have installed an EGA or VGA display adapter card,
or another type of card that you want to be the primary
display adapter, you must set jumper JP4 on the main
system board to disable the built-in VGA interface.
If you have installed one or more video cards, you also may
need to set jumper JP6 to tell the computer the type of
monitor you are using: either monochrome or color. If you
have two types of cards, set the jumper to indicate which one
is your primary monitor type. See Chapter 6 for instructions
on changing jumper settings.
1. At the main Setup menu, highlight Display. A submenu
appears identifying the current display adapter type, such
as the following:
VGA
If the display adapter type is correct for your system, you
can skip the rest of this section.
2. To change the display adapter setting, press (Enter. The
cursor block moves into the submenu and you see an
additional menu on the right side:
CGA
CGA
Monochrome 80 column
EGA,MCGA,VGA or other
40
column
80
column
Running the Setup Program
2-7