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Datapoint 2200
The Datapoint 2200 was a mass-produced programmable terminal, designed by Computer Terminal Corporation (CTC) founders Phil Ray and Gus Roche〔Lamont Wood, ("Forgotten PC history: The true origins of the personal computer" ), ''Computerworld'', 8 August 2008〕 and announced by CTC in June 1970 (with units shipping in 1971). It was presented by CTC simply as a versatile and cost-efficient terminal for connecting to a wide variety of mainframes by loading various terminal emulations from tape rather than being hardwired as most contemporary terminals. However, enterprising users in the business sector (including Pillsbury Foods) realized that this so-called "programmable terminal" was equipped to perform any task a simple computer could and exploited this fact by using their 2200s as standalone computer systems. Its industrial designer John "Jack" Frassanito has later claimed that Ray and Roche always intended the Datapoint 2200 to be a full-blown personal computer, but that they chose to keep quiet about this so as not to concern investors and others.〔〔Allen Weinkrantz, ("San Antonio Has Claim As The Birthplace of the Personal Computer. Read All About It." ), 2 June 2009〕 Also significant is the fact that the terminal's multi-chip CPU (processor) became the basis of the x86 architecture used in the original IBM PC and its descendants.
== Technical description ==
The Datapoint 2200 had a built-in full-travel keyboard, a built-in 12-line, 80-column green screen monitor, and two 47 character-per-inch cassette tape drives each with 130 kB capacity. Its size, , and shape—a box with protruding keyboard—approximated that of an IBM Selectric typewriter. Initially, a Diablo 2.5 MB 2315-type removable cartridge hard disk drive was available, along with modems, several types of serial interface, parallel interface, printers and a punched card reader. Later, an 8-inch floppy disk drive was also made available, along with other, larger hard disk drives. An industry-compatible 7/9-track (user selectable) magnetic tape drive was available by 1975. In late 1977, Datapoint introduced ARCnet local area networking. The original Type 1 2200 shipped with 2 kilobytes of serial shift register main memory, expandable to 8K. The Type 2 2200 used denser 1 kbit RAM chips, giving it a default 4K of memory, expandable to 16K. Its starting price was around US $5,000 (), and a full 16K Type 2 2200 had a list price of just over $14,000. The 2200 models were succeeded by the 5500, 1100, 6600, 3800, 8800, etc.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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