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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 8: Motherboards
      9  Form Factors

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AT

The AT form factor was originally a very popular motherboard. It remains the largest of the motherboard form factors at twelve inches wide and eleven to thirteen inches deep. The AT was the most common motherboard up to about 1995 and was used primarily with the 386-class processor. A unique characteristic of this form factor is that CPUs and memory modules (SIMMs and DIMMs) were inserted directly onto the motherboard. In today’s motherboards, those components are inserted into specially designed slots on the motherboard. Both processor and memory units were considerably smaller when the AT form factor was popular and did not require specific modules where they needed to be “plugged in”. You will see AT motherboards only in older, legacy machines and it is unlikely that as a technician, you will ever service one. Having said that, you never know when a friend or a client will ask you to work on the computer they’ve been relying on for the past ten years.


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