IBM 1711

The 1711 contained an analog-to-digital converter that accepted signals from the IBM 1712 Multiplexer and Terminal Unit that were between -50 millivolts and +50 millivolts and converted them into signed, four decimal digit numbers that were stored in the 1710s core memory.

The 1711 featured a real-time clock that could place the current hour and minute into storage, again as a 4 digit number.

On the 1711's control panel, there was a bank of seven decimal digit manual entry switches that could be read by the computer.

Optional 1711 features included contact sense, contact operate, analog output, interrupt, and process branch indicators.

[1] While all this and more would fit comfortably on a single IC today, the IBM 1711 occupied a three section rack cabinet.