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3090 is the first ND-110 CPU board (referred to as the "old" CPU card). It contains the CPU, bus arbitration logic, memory control, cache memory and other subsystems, including the Real time clock and the I/O for the serial console.


Switches and indicators

The following switches and indicators are on the card

Location 29J - potentiometer
Location 28J - ALD edge switch
Location 26J - baud rate edge switch
Location 21J - self test lamp (green)
Location 19J - running lamp (red)
Location 15J - cache on lamp (red)
Location 13J - cache on/off switch


The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.

I/O Devices on the card

See also

3095 new ND-110 CPU board