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200bps modem

Mus.Cat. NEWUC:2004.5 Mnfctr: IBM Date: circa 1970 Part No: 3976 Ser No: 10271
Comp: Modem Width: 510 mm Depth: 303 mm Height: 166 mm Weight: 15.5 Kg

This is the front of the modem with the red ON/OFF switch

One of its printed circuit boards has been extracted and placed on the modem. As you can see it is pretty basic.

A rear view with internals extracted. Apart from the size the thing what strikes one is the weight - 15.5 Kg. The enclosure is steel panels. The internal frame is steel. Two black transformers on the left are almost solid chunks of iron.

Last view of rear with two of the cards removed. Those big chunks are two iron rings clamped together with two windings each ring.

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