IBM RT Series Hardware Reference Manual page 146

IBM Monochrome Display
The following table describes the modes supported by BIOS on
the IBM Monochrome Display.
ALPHA BUFFER BOX MAX.
MODE# TYPE COLORS FORMAT START SIZE PAGES RESOLUTION
7 A/N 4 80x25 BOOOO 9x14 8 720x350
F APA 4 80x25 AOOOO 8x14 1/2 640x350
Mode 7 emulates the support provided by the IBM Monochrome
Display Adapter.
IBM Enhanced Color Display
The Enhanced Graphics Adapter supports attachment of the IBM
Enhanced Color Display. The IBM Enhanced Color Display is
capable of running at the standard television frequency of 15.75
KHz as well as running 21.85 KHz. The table below summarizes
the characteristics of the IBM Enhanced Color Display:
Parameter TV Frequency High Resolution
Horiz Scan Rate 15.75 KHz.
21.85 KHz.
Vertical Scan Rate 60 Hz.
60 Hz.
Video Bandwidth 14.318 MHz. 16.257 MHz.
Displayable Colors 16 Maximum 16 or 64
Character Size 7 by7 Pels 7 by 9 Pels
Character Box Size 8 by8 Pels 8 by 14 Pels
Maximum Resolution 640x200 Pels 640 by 350 Pels
Alphanumeric Modes 0,1,2,3 0,1,2,3
Graphics Modes 4,5,6,D,E
10
In the television frequency mode, the IBM Enhanced Color
Display displays information identical in color and resolution to
the IBM Color Display.
In the high resolution mode, the adapter provides enhanced
alphanumeric character support. This enhanced alphanumeric
support consists of transforming the 8 by 8 character box into an
8 by 14 character box, and providing 16 colors out of a palette of
6 IBM Enhanced Graphics Adapter