CertiGuide to A+ (Core Hardware)

Personal computer sales that were generated mostly from companies other than IBM skyrocketed.

In 1986, Compaq bested IBM by being the first company to release a PC based on the 386. One year later, IBM responded to the ‘clone invasion’ by releasing a new computer line-up, known as the Personal System 2 or PS/2 for short.

This new line of computers hosted an array of innovations including a new and completely incompatible method of accepting expansion cards. This new expansion bus was known as Micro Channel Architecture (MCA). IBM welcomed its competitors to use MCA, by paying a 'mere' dollar per slot for every computer made. Nobody was going to pay that, even if it was a 32-bit data bus.

**Figure 5: The MCA card above looks very similar to today’s PCI card. The plastic tab on the card is the MCA clue.**

IV PC Technology Evolution

EISA

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CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
Version 1.0 - Version Date: December 6, 2004

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