IBM RT User's Setup Manual page 342

Use this table to set the mode switches when any of the following
conditions are present:
• The IBM Personal Computer Enhanced Color Display (5154) is
attached to the Enhanced Graphics Adapter.
• The IBM Personal Computer Enhanced Color Display (5154) is
assigned to the AT Coprocessor Adapter in
• Another display is also installed and assigned to the AT
Coprocessor Adapter as a second display.
IBM 5154 Display
Operating Mode or
IBM 5154 Display
Assignment Emulation Mode
80 X 25 High
Primary
Resolution
Primary 80 X 25 Enhanced
Color
Secondary 80 X 25 High
Resolution
Secondary 80 X 25 Enhanced
Color
If you need to install the expansion card, go to "IBM PC Graphics
Memory Expansion Card" on page 7-10. If you need to install the
expansion kit, go to "IBM PC Graphics Memory Expansion Kit" on
page 7-12. To install the adapter, go to page 7-13.
dedicated
Sw 1 Sw2
On
Off
On On
Off
Off
On Off
Section 7. Display Adapter Options 7-9
mode.
Sw3 Sw4
On
Off
On Off
On On
On On