IBM 2274 - Manual (Page 161)

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