Computer Automation

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Computer Automation Incorporated
Industry Computer manufacturing
Founded 1968
Defunct 1992
Headquarters Richardson, Texas, USA
Key people David H Methvin (founder)
Products Naked Mini minicomputers
Naked Milli minicomputers
Marathon Automatic Test Systems (Functional Board Testers - In-Circuit Board Testers)

Computer Automation Inc. was a computer manufacturer founded by David H Methvin in 1968, based originally in Irvine, California, USA.

In 1981 they moved to Boulder, Colorado, and in 1985 moved back to Irvine, California[1] and finally in 1990 moved to Richardson, Texas.[2]

Computer Automation in the UK[edit]

Computer Automation opened a sales, support and repair arm in the UK in 1972, based at Hertford House, Maple Cross, Rickmansworth, Herts. Later relocated to Suite 2 Milfield House, Croxley Centre, Croxley Green, Watford, Herts.

The first products seen there were the 404, 808 and 816 minicomputers or process controllers.

Chronologically the next machine dating from the late 1960s and early 1970s was the Alpha 8, an eight bit machine, and Alpha 16 which merely doubled up this concept to make a 16-bit machine. Both were built using DTL and TTL devices. The processor for the Alpha 8 and Alpha 16 each comprised three full sized circuit boards about 18 inches square, then there were the memory options, 4k, 8k and rarely 16k magnetic core full cards. There were number of options for data input, paper tape via a board called the utility controller which could also be used to drive other devices such as printers, etc. There was a magnetic tape controller which was a full card and a Winchester interface disk controller which was two full cards with a circuit board jumper which interlinked the two cards. The programmers console had a row of toggle switches for data entry of bootstrap routines, etc. Two chassis were available, standard and jumbo with separate power supplies. There was a variety of other cards are available for various forms of input output and process control, relay cards, dual teletype cards, etc.

During the very early 1970s the LSI-1 was developed, an early excursion into large gate arrays which formed the arithmetic logic unit and sundry other parts of the architecture of the computer. It was a dismal failure and was not released on the market. It was superseded by the LSI-2 which implemented the same architecture using standard TTL logic. The LSI-2, comprised a single full card with two piggyback half cards, on the lefthand side viewed from the back was the card containing the microcode in fuse link bipolar Proms, on the right the options card with the bootstrap Proms and serial interface for current loop teletype or RS. 232 device. There were a couple of speed options of processor available, the 2/10 with a 10 MHz clock and 2/20 with a 20 MHz clock. Another option was the 2/60 which used different microcode on the half card to support an enhanced instruction set used uniquely by Computer Automation’s SyFa (System For access) data processing systems. There were two types of console available, the operators console which merely had enough functionality to enable an operator to boot the system, and a programmer’s console which would enable data entry for bootstrap routines, etc. Memory options included magnetic core of between 4 and 16k and later semiconductor memory of up to 32k in a variety of formats, full card and half card. Memory banking where blocks of memory could be switched in or out to a degree bypassed the restrictions of a 16 bit address buss. The buss format for input output devices remained the same as Alpha 8 and Alpha 16 therefore many of the I/O devices for the earlier product could still be used. However the LSI 2 had a different dual card hard disk controller and a number of different options for half card floppy controllers. The chassis available was a five slot with internal PSU or nine slot with external PSU.

Both the Alpha systems and LSI systems were tested using a programme called QCD – quality-control diagnostic. There were a number of different versions of this around, for the Alpha machines on paper tape, hard disk or magnetic tape, and for the LSI systems paper tape, floppy disk, hard disk and magnetic tape. There were also other diagnostics for every product, many I/O devices requiring a wired loopback header connecting output to input in a particular pattern so that the device could test itself.

Another product of the mid-1970s was a cut down and cut-price half card processor, the 3/05. This had its own unique half card chassis and power supply, plus its own console.

In the late 1970s a major redesign of the LSI 2 took place to integrate the two piggyback cards into the main full card, this became the 2/40 and 2/120. Another enhancement to speed operation was the introduction of cache in the form of another full card, plus an expansion of memory with 64k semiconductor modules in the form of a full card becoming available. Again the restrictions of the 16 bit address bus still meant memory banking was a necessity for memory greedy applications. The increase speed of the “Super 2” as the systems were called required a new revision of motherboard but this was backwards compatible with the earlier systems.

Another product range emerged in the late 1970s, the Naked Mini 4 range of systems. These were still implemented in TTL but used a different and enhanced instruction set. They ranged from the 4/10, which was a half card replacement for the 3/05, through the full card 4/30 to the 4/95. Although there was some compatibility with a few of the I/O cards from the LSI-2, everything about the NM4 series was generally speaking unique.

As Computer Automation moved into the 1980s it became apparent that the concept of the minicomputer was getting a little long in the tooth. Microcomputers such as the 8080, Z80 and 6502 could be incorporated into much process control equipment. Computer Automation decided to bring out the Scout or Naked Milli range of products to try to compete with these microcomputers, without a great deal of success.

Computer Automation consisted of three were divisions, firstly:

Naked Mini which sold minicomputer's to OEMs, where they were used in process control.

IPD (Industrial Products Division) manufactured automatic test equipment, (Computer Automation had designed an ATE to production test its own product in-house. CA decided this was a marketable product which became the Capable). The first Capable testers used an Alpha 16, later models use the LSI-2. These were functional ATE which ran a program against the UUT (Unit Under Test) to exercise all logic functions. A later development was the Marathon in circuit tester, which as the name suggests measured viability of components in-circuit.

SyFa (Systems for Access) manufactured programmable distributed data processing systems using the LSI 2/60 and later the 2/120 as the core. These were used by many companies to perform jobs such as stock control, order processing, etc. Originally the systems were manufactured and assembled in the States and shipped to the UK for commissioning, but by the late Seventies a production facility was in place at a separate unit at Maple Cross near Rickmansworth in England.

In 1979 a production facility opened up at Clonshaugh in Dublin, taking advantage of tax concessions introduced by the Irish Government.

The company last filed a financial statement in 1992.[3]


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