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2. IBM Personal Computer AT - Wikipedia

   en.wikipedia.org/wiki/IBM_Personal_Computer_AT

   The IBM Personal Computer AT (model 5170, abbreviated as IBM AT or PC/AT) was released in 1984 as the fourth model in the IBM Personal Computer line, following the IBM PC/XT and its IBM Portable PC variant. It was designed around the Intel 80286 microprocessor.

3. List of IBM Personal Computer models - Wikipedia

   en.wikipedia.org/wiki/List_of_IBM_Personal...

   The original IBM Personal Computer, with monitor and keyboard. The IBM Personal Computer, commonly known as the IBM PC, spanned multiple models in its first generation (including the PCjr, the Portable PC, the XT, the AT, the Convertible, and the /370 systems, among others), from 1981 to 1987.

4. IBM Personal Computer - Wikipedia

   en.wikipedia.org/wiki/IBM_Personal_Computer

   The IBM Personal Computer (model 5150, commonly known as the IBM PC) is the first microcomputer released in the IBM PC model line and the basis for the IBM PC compatible de facto standard. Released on August 12, 1981, it was created by a team of engineers and designers at International Business Machines (IBM), directed by William C. Lowe and ...

5. AT (form factor) - Wikipedia

   en.wikipedia.org/wiki/AT_(form_factor)

   IBM PC AT System Board. This is the original AT motherboard on which the form factor was based. In the era of IBM compatible personal computers, the AT form factor comprises the dimensions and layout (form factor) of the motherboard for the IBM AT. Baby AT motherboards are slightly smaller, measuring 8.5" by 13". [1]

6. Industry Standard Architecture - Wikipedia

   en.wikipedia.org/wiki/Industry_Standard_Architecture

   Industry Standard Architecture (ISA) is the 16-bit internal bus of IBM PC/AT and similar computers based on the Intel 80286 and its immediate successors during the 1980s. The bus was (largely) backward compatible with the 8-bit bus of the 8088-based IBM PC, including the IBM PC/XT as well as IBM PC compatibles.

7. Option ROM - Wikipedia

   en.wikipedia.org/wiki/Option_ROM

   The CGA and MDA support in the BIOS proper was maintained through the IBM PC XT and PC AT product lines (which did support option ROMs), so that those cards worked (with full BIOS support) in those machines. The first PC video adapter card that had an option ROM was the IBM EGA, introduced in 1984 with the IBM PC AT.