May 2014
Intermediate to advanced
320 pages
13h 41m
English
Content preview from Servicing Personal Computers, 3rd Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
260
Table 6.22 512K memory expansion adapter DIL switch settings
Expansion
First 512K
Second 512K
Third 512K
Fourth 512K
Fifth 512K
Bank
0
1
0
1
0
1
0
1
0
1
1
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
2
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
3
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
DIL switch
4
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
number
5
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
6
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
7
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
8
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Note: 128K base memory expansion has no DIL switches fitted.
Figure 6.44. IBM PC-XT system board RAM
261
Bank
Bank
10
10 11
12
12
13
13
04 0002 4000
14
14
15
15
Figure 6.45. PC-AT system boar ...