Hardware Reference
In-Depth Information
Figure 4.2. IBM PC-XT motherboard (circa 1983).
Note
The Technical Reference section of the disc accompanying this topic contains detailed
information on the PC (5150) and XT (5160). All the information there is printable.
The minor differences in the slot positions and the deleted cassette connector on the back required a
minor redesign of the case. In essence, the XT was a mildly enhanced PC, with a motherboard that
was the same overall size and shape, used the same processor, and came in a case that was identical
except for slot bracketry and the lack of a hole for the cassette port. Eventually, the XT motherboard
design became popular, and many other PC motherboard manufacturers of the day copied IBM's XT
design and produced similar boards.
Full-Size AT
The full-size AT motherboard form factor matches the original IBM AT motherboard design. This
