This BCC-500 Discrete ROM board is 64 microcode words x 90 bits wide. There is a stiffener at one end near the double sided connector with a total 136 pins.
Identifying Numbers
Other number
CPU#4
Handwritten in black on the board to the right of the component side near insertion end
Other number
NE 117
Scratched into the board to the right of the component side near the insertion end
Other number
NE00016
Printed in solder to the right of the component side near the insertion end
Other number
NE00016
Printed in solder on the solder side on the left
Other number
PC 81
Scratched into the board to the right of the component side near the insertion end