The IBM 1800 Data Acquisition and Control System (DACS) was a process control variant of the

IBM 1130 The IBM 1130 Computing System, introduced in 1965, was IBM's least expensive computer at that time. A binary 16-bit machine, it was marketed to price-sensitive, computing-intensive technical markets, like education and engineering, succeeding th ...

with two extra instructions (CMP and DCM), extra I/O capabilities, 'selector channel like' cycle-stealing capability and three hardware index registers. 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."

Overview

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. Many 1800 cabinets show a distinct "ding" on the vents at the top of the chassis, where movers discovered that the door into a computer room was not quite tall enough for the 1800 cabinet. The IBM 1500 instructional system was introduced by IBM on March 31, 1966, and was based on an IBM 1130 or IBM 1800 computer. It supported up to 32 student work stations, each with a variety of audiovisual capabilities. Two 1800s with automatic switchover between them powered each IBM 1750, 2750 and 3750 Switching System.

Components

The IBM 1800 DACS consisted of: * D/A (Digital-to-Analog) Converter * A/D (Analog-to-Digital) Converter * IBM 1801 Processor Controller, with operator's panel * IBM 1802 Processor Controller, with operator's panel, to include adapters for 2401/2402 Magnetic Tape Units. * IBM 1803 Core Storage Addition * IBM 1826 I/O Expansion Chassis (used for communications I/O, System/360 channels, 279x) * IBM 1828 Process Expansion Unit (used for additional D/A or A/D converters, or to hold 1851 and/or 1854 multiplexors; there was an RPQ for a remote 1828 unit) * IBM 1810 Disk (equivalent to 2310 on IBM 1130) * IBM 1816 Printer Keyboard (System Printer) * IBM 1851 Reed Relay Analog Multiplexor * IBM 1854 Solid State Analog Multiplexor * IBM 1894 generic model number for many 1800 RPQ hardware features, which inter alia, included support for IBM 109x data entry devices) * IBM 1053 Printer * IBM 1054 Paper Tape Reader Unit * IBM 1055 Paper Tape Punch Unit *

IBM 1442 IBM 1442 is a combination IBM card reader and card punch. It reads and punches 80-column IBM-format punched cards and is used on the IBM 1440, the IBM 1130, the IBM 1800 and System/360 and is an option on the IBM System/3. Overview The 1442 can ...

Card Reader/Punch Unit * IBM 1443 Printer *

IBM 1627 The IBM 1627 was a rebranded Calcomp plotter sold by IBM for use with the IBM 1620, and, later, the IBM 1130 computers. It became perhaps the first non-IBM peripheral that IBM allowed to be attached to one of its computers. The plotter fed a ...

Plotter * IBM 2401 or 2402 Magnetic Tape Unit (its adapter included in IBM 1802) * IBM 2311 DASD (attached via an IBM 2841 Control Unit, latter attached to a channel in the IBM 1826), the MPX operating system could map two 1810 disks per 2311, the 1810 drive mapping being seen as a Format 5

DSCB In the IBM System/360Including the successors S/370 through z/Architecture storage architecture, the Volume Table of Contents (VTOC), is a data structure that provides a way of locating the data sets that reside on a particular DASD volume. With th ...

to S/360 OS) * IBM 2260 CRT (attached via an IBM 2848 Control Unit, latter attached to a channel in the IBM 1826) * IBM 2790 Data Communication System, one of the earliest

token ring Token Ring network IBM hermaphroditic connector with locking clip. Screen contacts are prominently visible, gold-plated signal contacts less so. Token Ring is a computer networking technology used to build local area networks. It was introduc ...

type local area networks were attached and controlled by the IBM 1800.

Use

The IBM 1800 systems were used mainly in the process industry plants worldwide, such as in the 1971 installation on Blast Furnace No. 5 of Chiba Works of Kawasaki Steel Company, now part of JFE Group. In June 2010 the last four operating IBM 1800s operating at Pickering Nuclear Generating Station in Pickering, Ontario, Canada were removed from service. Pickering is still using four ES-1800 computers which are IBM 1800 hardware emulators built by Cable & Computer Technologies. A video showing the end of the Pickering IBM 1800 boot sequence is available on YouTube IBM 1800 console boot sequence
/ref> Until 1984, Exxon USA (EUSA) had 18 IBM 1800 systems deployed at all 5 of its refineries. They were replaced with

Honeywell Honeywell International Inc. is an American publicly traded, multinational conglomerate corporation headquartered in Charlotte, North Carolina. It primarily operates in four areas of business: aerospace, building technologies, performance ma ...

TDC3000 process control systems.

References

External links

IBM 1130.org
which has significant information about the 1130 and 1800.

which recently acquired an 1800 from a Canadian power plant and reports others are still in service.
"Evolution of Small Real-Time IBM Computer Systems"
(1.25 MB PDF file), from the IBM Journal of Research and Development.
Opendragon site
has two pictures of the 1800 in operation.

* ttp://www.dvq.com/1800/1800.htm Bob Rosenbloom's IBM 1800 Photosbr>Blog relating efforts to restore a long-disused 1130 system to running condition
{{Authority control

1800 As of March 1 ( O.S. February 18), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 12 days until February 28 ( O.S. February 16) ...

fr:IBM 1130 et 1800