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The heart of the DSTN telemetry decoding were several dozen UNIVAC 1230 systems deployed on site at the DSTN tracking stations around the world. Originally designed for use on naval vessels, The modified 1230s, known as 642B military computers, used ferrite core memory and were military hardened to handle 140 degree temperatures as well as salt spray.
The computer room of DSTN station Fresnedillas, outside Madrid, Spain. The systems shown here are for the Apollo 8 mission and are UNIVAC 1218, a forerunner to the 1230s used on Apollo 11.
A sales brochure for the UNIVAC 1230 computer.