The dimension developing board

The dimension developing board

The first backplane to qualify as a motherboard was the Planar Breadboard, designed by IBM engineer Patty McHugh and used in the 1981 IBM Personal Computer. The board consisted of a 4.77 megahertz microprocessor, 16 KB of memory, 8-bit ISA connectors, and ports for connecting a keyboard and a cassette tape (for data storage). Other components, such as a display adapter or hard disk controller, had to be added, in the style of a backplane, by placing a plug-in board, or “expansion card,” into one of the motherboard’s expansion slots.

In 1984 IBM introduced the advanced-technology (AT) motherboard, now called the “full AT.” This board had the basic design that is still familiar today, and it became the standardized motherboard for all desktops and tower cases. At about 30 cm (12 inches) by 33 cm (13 inches), though, the size of the board made it difficult to upgrade a computer, much less fit the board into the new, more popular slimline desktop cases. The production of the Baby AT (BAT) motherboard in 1989 solved these problems, as its measurements were a relatively petite 21.6 cm (8.5 inches) by 33 cm (13 inches).

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