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IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

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32/64KB Memory Expansion Option <br />

Switch Settings <br />

Note: Positions 6-7-8 must always be ON. The sequence shown<br />

below must be followed to allow the system to address the<br />

~ memory properly.<br />

32 KB<br />

12345678<br />

96 KB t~LJu~LJDDD<br />

128 KB t~~~~~ooo<br />

64 KB<br />

32 KB 32 KB<br />

64KB<br />

32KB<br />

32 KB 32 KB 32 KB<br />

12345678 12345678 12345678<br />

160 KB<br />

t[j[j[j~[jDDD t [j[j[j~~DDD t[j[j~[1uDDD<br />

64 KB 64 KB<br />

12345678 12345678<br />

192 K8 t[jLJLJ~[jDDD t [jLJ~LJ[jDDD<br />

64 KB 32 KB 32 KB<br />

12345678 12345678 12345678<br />

192 KB<br />

tLJ[j~~[jDOD t[j[j~~[jDDD t[j~~[j~DDO<br />

64 KB 64 KB 32 KB<br />

12345678 12345678 12345678<br />

224 KB<br />

tu~[j~[jDDD t[j~~~~DDD t~~~~uDDD<br />

64 KB 64 KB 64 KB<br />

2-31

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