IBM RT Series Hardware Reference Manual page 151

Displays. Four color capability is supported on the EGA without
the Graphics Memory Expansion Card (base 64 KB), and sixteen
colors are supported when the Graphics Memory Expansion Card
is installed on the adapter (128 KB or above). This section
describes the differences in the colors displayed depending upon
the graphics memory available. Note that colors OH, IH, 4H, and
7H map directly regardless of the graphics memory available.
Character Mode 10H Mode 10H
Attribute Monochrome
64KB >64KB
OOH* Black Black Black
01H* Video Blue Blue
02H Black Black Green
03H Video
Blue
Cyan
04H*
Blinking Red Red
OSH Intensified White Magenta
06H Blinking Red Brown
07H* Intensified White White
08H Black Black Dark Gray
09H Video Blue Light Blue
OAH Black Black Light Green
OBH Video Blue Light Cyan
OCH Blinking Red Light Red
ODH Intensified White Light Magenta
OEH Blinking Red Yellow
OFH Intensified White Intensified White
*
Graphics character attributes which map directly regardless of
the graphics memory available.
IBM Enhanced Graphics Adapter 11