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
CH10 0
Scratched into the board to the right of the component side near the insertion end
Other number
NE 145
Scratched into the board to the right of the component side near the insertion end
Other number
NE00016.1-1
Printed in solder to the right of the component side near the insertion end