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The HP 9800 was a family of what were initially called programmable calculators and later desktop computers made by Hewlett-Packard, replacing their first HP 9100 calculator. The 9830 and its successors were true computers in the modern sense of the term, complete with a powerful BASIC language interpreter. == Models == Chronologically, the models of the family were: * HP 9810A, a keystroke programmable computer with magnetic cards and LED display, introduced in 1971, * HP 9820A, introduced in 1972, featured a high level language simpler than BASIC that was later named high performance language (HPL), * HP 9821A, similar to the HP 9820A, however, with Compact Cassettetape drive with clear leaders instead of using magnetic cards. Tapes created on the HP 9821A could be read by the HP 9830A. Unlike later home computers which used standard cassette audio recorders which had to be manually put into record or play mode, it was completely controlled by software command, and could save and load to a file by number. * HP 9830A, introduced in 1972, was the top of the 9800 line; having BASIC interpreter in read-only memory (ROM). All 98x0 and 9821 systems used the same I/O interfaces. A 400 line per minute 80-column thermal line printer was designed to fit on top of the 9820 and 9830. The success of the HP9830 led to a next generation with faster logic: * HP 9805A, the least expensive model using the same chassis as the HP46 (scientific) and HP81 (business) calculators. This was a Programmable Calculator and had plug-in personality modules. * HP 9815A/S, The HP 9815A was HP's third generation high end RPN desktop. It was much smaller, lighter and less expensive than its predecessor. It provided only a single line display but replaced the earlier card drives with a tape drive. * HP 9825A/B, featured HPL, a single-line display, and optional thermal printer, * HP 9831, an HP9825 with BASIC instead of HPL, * HP 9835, featured BASIC. There were two models, the A and B. The A had a CRT, and the B had a single-line display, * HP 9845 introduced first as a monochrome (9845A/S), then a high-performance monochrome (9845B/T) and a high performance color (9845C/T) model. The 9845 came with one tape drive, and optional second tape drive and 80 column wide thermal printer. All the 98x5, with the exception of the 9805, used DC200 cartridge tapes, instead of cassette tapes. The 9825, 9831, 9835, and 9845 all used the same I/O interfaces. the 9815 had a unique I/O interface. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「HP 9800 series」の詳細全文を読む スポンサード リンク
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