PC Hardware A Beginner’s Guide

(^74) PC Hardware: A Beginner’s Guide

The IBM PC XT

The successor to the IBM PC was the IBM PC XT (Extended Technology). The mother-

board of the PC XT was about the same size, but it included three more expansion slots

(eightcomparedtofive)andreplacedthecassettetapewitha5.25-inchfloppydiskdrive.

Form Factor

Width

(in inches)

Length

(in inches) Design Type Case Type

IBM PC 8.5 13 Motherboard IBM PC

IBM PC XT 8.5 13 Motherboard IBM PC XT

AT 12 11-13 Motherboard AT Desktop

or Tower

Baby AT 8.5 10-13 Motherboard Baby AT

Desktop

or Tower

LPX 9 11-13 Backplane Low profile

Micro-AT 8.5 8.5 Motherboard Baby AT

Desktop

or Tower

ATX 12 9.6 Motherboard ATX Desktop

or Tower

Mini-ATX 11.2 8.2 Motherboard Smaller ATX

Desktop

Mini-LPX 8-9 10-11 Backplane Low profile

Micro-ATX 9.6 9.6 Motherboard Low profile

NLX 8-9 10-13.6 Backplane Low profile

Flex-ATX 9 7.5 Motherboard Flexible design

Table 4-1. Motherboard Form Factors