The IBM 1800 Data Acquisition and Control System (DACS) was a process control variant of the IBM 1130 with two extra instructions (CMP and DCM), extra I/O capabilities, 'selector channel like' cycle-stealing capability and three hardware index registers.

[1] IBM announced and introduced the 1800 Data Acquisition and Control System on November 30, 1964, describing it as "a computer that can monitor an assembly line, control a steel-making process or analyze the precise status of a missile during test firing.

"[2] Unlike the 1130, which was a desk-like unit, the 1800 is packaged in 6 foot high, EIA Standard 19 inch racks, which are somewhat taller than the racks used by S/360 systems of the same vintage, but the internal gates and power supplies were very much the same.

It supported up to 32 student work stations, each with a variety of audiovisual capabilities.

[5] A video showing the end of the Pickering IBM 1800 boot sequence is available on YouTube [6] Until 1984, Exxon USA (EUSA) had 18 IBM 1800 systems deployed at all 5 of its refineries.