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DIMM Configurations
The 2153 system board has two DIMM sockets. A maximum of 256KB
memory may be installed. The 2139 system board has three DIMM sockets.
A maximum of 384KB memory may be installed.
You can install 16MB, 32MB, 64MB, or 128MB PC-100 DIMM in any sockets
and with any combinations.
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
2 Green Video O 10 Synch Ground
3 Blue Video O 11 Monitor ID Bit 0 I
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
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
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