Apollo Command Module PCM (Pulse Code Modulation) Assembly, measuring 14.5″ x 14″ x 9″, with ports on the top marked "J1" through "J18," with three additional ports on the side, marked "J20" through "J22." The top and side both bear diagrams identifying the ports. Mounted on a metal base and in fine condition.
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Terms and abbreviations used in our descriptions.