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System Board Connector Pin Signals
Monitor Port Signals
Pin  Signal Name I/O Pin  Signal Name I/O
1  Red Video O 9  +5 V dc N/A
2  Green Video O 10  Synch Ground N/A
3  Blue Video O 11  No Connection N/A
4  No Connection N/A 12  Monitor ID Bit 1 I
5  Synch Ground N/A 13  Horizontal Synch O
6  Red Ground N/A 14  Vertical Synch O
7  Green Ground N/A 15  Monitor ID Bit 3 I
8  Blue Ground N/A
Serial Port Signals
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 To Send O
3  Transmit Data O 8  Clear To Send I
4 Data Terminal
Ready
O 9  Ring Indicator I
5  Signal Ground N/A
Parallel Port Signals
Pin  Signal Name I/O Pin  Signal Name I/O
1  Strobe O 14  Auto Feed N/A
2  Data Bit 0 I/O 15  Error I
3  Data Bit 1 I/O 16  Initialize O
4  Data Bit 2 I/O 17  Select (In) O
5  Data Bit 3 I/O 18  Ground Power
6  Data Bit 4 I/O 19  Ground Power
7  Data Bit 5 I/O 20  Ground Power
8  Data Bit 6 I/O 21  Ground Power
9  Data Bit 7 I/O 22  Ground Power
10  Acknowledge I 23  Ground Power
11  Busy I 24  Ground Power
12  Paper Empty I 25  Ground Power
13  Select O
Mouse Port Signals
Pin  Signal Name I/O Pin  Signal Name I/O
1  Mouse Data I/O 4  +5 V dc Power
2  No Connection N/A 5  Mouse Clock I/O
3  Ground Power 6  No Connection N/A