IBM PC XT Setup

Note: Some Sitchblocks are labeled ON and OFF; others are labeled ON and OPEN. OPEN is the off position. On my drawings ON is always up. This example shows the first switch in it's normal OFF position. NEVER move this switch to the on position.

Motherboard layout

 

Switch

1

2

3-4

5-6

7-8

Function

Normal Operation; Always OFF

Coprocessor

System board memory

Display type

Number of disk drives installed

Coprocessor

With Coprocessor
Without Coprocessor

Memory

256k
512k
640k

Display

EGA or NO adapter at all
CGA 40X25
CGA 80X25
Mono or Mono + CGA

Disk Drives

One disk drive
Two disk drives