IBM RT Series Hardware Reference Manual page 222

Switch Settings for Enhanced Graphics Adapter
as Secondary Display Adapter
Configuration
Enhanced Monochrome Color/Graphics
SWl SW2 SW3 SW4 Adapter Adapter Adapter
On On On On Color Display Primary
-
40x25
Off On On On Color Display Primary
-
80x25
On Off On On Enhanced Display Primary
-
Emulation Mode
Off Off On On Enhanced Display Primary
-
Hi Res Mode
On On Off On Monochrome
-
Primary
40x25
Off On Off On
Monochrome
-
Primary
80x25
82 IBM Enhanced Graphics Adapter