Apollo Command Module Block II Up-Data Link (UDL) equipment measuring approximately 9 x 17.75 x 5.5, labeled “C28-1A103.” The unit has five connectors, “J1” through “J5” on the top, and another, “J6,” on the side with part numbers scratched off. Affixed to original metal base. In fine condition. The up-data link consists of detecting and decoding circuitry, a buffer storage unit, output relay drivers, and a power supply, and provides the means for the ground to update the computer and the central timing equipment of the spacecraft. The device could receive, verify, and distribute digital updating information sent from the Manned Space Flight Network at various times throughout the mission.
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