IBM RT Series Hardware Reference Manual page 218

The following figure shows the layout and pin numbering of the
feature connector.
Signal Name Signal Name
Gnd - 1
2-
~
.......
-12V
-
--
+12V
J1
J2
-
.-
G'OUT
R'OUT
-
B'OUT
ATRS/L
-
-
BOUT
GOUT
-
-
G
-
-
R'
B
R
ROUT
FEAT 1
-
-
BLANK
FEAT
0
-
FC1
FCO
-
G'/I
S'N
-
HIN
- -
-
VIN
14MHz
-
--
Internal
EXT OSC
-
-
VOUT
HOUT
GND
: 31
32 .-
+5V
"=
"
Feature Connector Diagram
78 IBM Enhanced Graphics Adapter