IBM 6151 Maintenance And Service Manual page 588

Use this table to set the mode switches when the following
conditions are present:
• The IBM 5151 Personal Computer Display is attached to the
IBM PC Enhanced Graphics Adapter.
• The IBM 5151 is assigned to the RT PC AT Coprocessor Option
in dedicated mode.
• Another display may also be installed and assigned to the RT
PC AT Coprocessor Option as a second display.
Second Display
IBM 5151
Mode of
Assignment Operation
Swl Sw2 Sw3 Sw4
Primary 80 X 25 Color Off Off On Off
Primary 40 X 25 Color On Off On Off
Secondary
80 X 25 Color
Off
On Off On
Secondary 40 X 25 Color On
On Off On
9-042-4 Service Manual