System board connector pin signals, Monitor port signals serial port signals – IBM 2274 User Manual
Page 161
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Parts/Test Point Locations 127
System Board Connector Pin Signals
Monitor Port Signals
Serial Port Signals
Pin
Signal
Name
I/O
Pin
Signal
Name
I/O
1
Red Video
O
9
+5 V dc
2
Green Video
O
10
Synch
Ground
3
Blue Video
O
11
Monitor ID Bit
0
4
Monitor ID Bit
2
I
12
SDA
I
5
Synch
Ground
13
Horizontal
Synch
O
6 Red
Ground
14
Vertical
Synch
O
7
Green
Ground
15
SCL
I
8
Blue Ground
Pin
Signal
Name
I/O
Pin
Signal
Name
I/O
1
Data Carrier
Detect
I
6
Data Set
Ready
I
2
Receive
Data
I
7
Request T
Send
O
3
Transmit
Data
O
8
Clear T
Send
I
4
Data
Terminal
Ready
O
9
Ring
Indicator
I
5
Signal
Ground
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