At the top right under 2 red toggles, and LED's is Model no. MPC-75 675001 issue a serial no. 055 date 10 82 on the bottom right are AIR LAND SYSTEMS and 2 pins labelled spkr terms. The bottom is 2 groups of 22 pins the first group has a break between pins 7-8 and the second group between 13-14 A PROM1 is labelled NTRKBD .101-1-1.2683 in pencil on the top left below a 25 pin connector with 2 missing in the centre. On the left edge is CCA 94V0 8-82 card is about 10" by 7" the pins groups are 3.5" with a 1.25" gap