IBM 2274 Personal Computer User Manual


 
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
5Synch
Ground
13 Horizontal
Synch
O
6 Red Ground 14 Vertical
Synch
O
7Green
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
3Transmit
Data
O 8 Clear T
Send
I
4Data
Te r mi n al
Ready
O 9 Ring
Indicator
I
5Signal
Ground