IBM PC/AT

Valmistaja

IBM

Tyyppi

mikrotietokone

Julkaistu

1984

Suoritin

Intel 80286

Massamuisti

levykeasema
kiintolevy (PC-AT 2)

Keskusmuisti

256/512 kilotavua - 3 megatavua

Edeltäjä		Seuraaja
← IBM PC/XT		IBM PS/2 →

IBM PC/AT (sanoista Advanced Technology) (mallinumero 5170) oli IBM:n valmistama mikrotietokone, joka julkaistiin vuonna 1984.^[1]^[2]

Malli oli seuraaja alkuperäiselle IBM PC:lle (mallinumero 5150) ja IBM PC/XT:lle (5160).^[3]

PC/AT:n esittely oli yllätys IBM:n kilpailijoille. AT oli vain hiukan vanhoja malleja kalliimpi ja huomattavasti nopeampi. Yksikään merkittävistä kilpailijoista ei pystynyt esittelemään vastaavaan mallia vuoden 1984 COMDEX-messuilla samana vuonna.^[4]

Tekniikka

Mallissa oli kaksi vaihtoehtoa: PC-AT mallissa 1 oli 256 kilotavua RAM-muistia ja PC-AT mallissa 2 oli 512 kilotavua.^[1] Muisti oli laajennettavissa kolmeen megatavuun.^[3] Mallissa oli EGA-näyttögrafiikka.^[3] Suoritin oli 6 MHz:n Intel 80286.^[3]

AT esitteli 16-bittisen ISA-väylän (AT-väylä). Arkkitehtuuri antoi laitteiden käyttöön 15 IRQ-keskeytystä ja seitsemän DMA-kanavaa, kun PC:ssa rajat olivat kahdeksan ja neljä. Tämä saavutettiin lisäämällä toinen 8259A-IRQ-kontrolleri ja toinen 8237A-DMA-kontrolleri.^[5]^[6]

Emolevylle on lisätty paristovarmistettu reaaliaikakello Motorola MC146818. Se sisälsi myös 50 tavua muistia, joten kaikkia laitteiston asetuksia ei tarvinnut valita DIP-kytkimillä.

5½ tuuman levykeasema pystyy käyttämään 1,2 MB:n levykkeitä. 20 MB:n kiintolevy on vakiovaruste.

Mukana tuli uusi Model F 'AT' -näppäimistö. Liitin on sama 5-pinninen DIN-liitin, mutta protokolla on erilainen, ja tietokone voi hallita näppäimistön Caps Lock, Scroll Lock ja Num Lock -led-valoja.

Lähteet

↑ ^a ^b IBM 5170 / PC AT center for computing history. Viitattu 6.5.2019. (englanniksi)
↑ How the IBM PC Won, Then Lost, the Personal Computer Market spectrum.ieee.org. 21.7.2021. Viitattu 13.8.2021. (englanniksi)
↑ ^a ^b ^c ^d PC AT old-computers.com. Arkistoitu 4.4.2019. Viitattu 6.5.2019. (englanniksi)
↑ Sanger, David E.: I.B.M. Entry Unchallenged at Show. The New York Times, 19.11.1984. ISSN 0362-4331 Artikkelin verkkoversio. Viitattu 3.7.2017. (englanti)
↑ Derfler, Frank J. Jr.: Tutor. PC Magazine, 26.12.1989. Ziff Davis. ISSN 0888-8507 Artikkelin verkkoversio.
↑ Mathivanan, N.: PC-Based Instrumentation: Concepts and Practice, s. 227–229. PHI Learning, 2007. ISBN 978-81-203-3076-4 Teoksen verkkoversio.

IBM PC

Mallit	IBM PC 5150 IBM PC/XT IBM PCjr IBM PC/AT IBM PS/2 IBM PS/1 IBM Aptiva
Käyttöjärjestelmät	PC-DOS OS/2
Katso myös	IBM PC -yhteensopiva tietokone

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