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