BCC-500 Discrete microcode ROM board
||Handwritten in black ink on the right of the component side near the insertion end
||Faintly stamped in black on the solder side in the insertion end corner
||Printed in solder to the right of the component side near the insertion end
||Printed in solder along the edge
overall: 1/4 in x 10 in x 12 in
The board is 64 microcode words by 90 bits wide. There is a stiffener at one end near the double sided connector with a total 136 pins.