This appears to be a quad size UniBus card with a dual connector 4607 type vector board screwed to the main printed circuit board. There are a large number of wire jumpers connecting the two boards together. The vector board is wire wrapped, the main board is soldered. There is a ribbon connector at the top of the main board and six edge connectors at the bottom of the board.. There are a large number of integrated circuits, including many PALs and PROMS. This module along with the data path (DAP) [X326.84] were the original breadboard modules for the MicroVAX I.
Date
1983 (DC)
Manufacturer
Digital Equipment Corporation (DEC)
Place Manufactured
U.S.
Identifying Numbers
Other number
12483
Printed on the green part in the middle on component side
Other number
94V340
Etched on the PC board at the vector board edge.
Other number
EXP21-A
Etched on the component side on the ribbon connector edge.
Other number
EXP21-A
Printed on the solder side on the vector board edge.