32/64Kb Memory Expansion Option Switch Settings - IBM 5150 Hardware Reference Manual

32/64KB Memory Expansion Option
Switch Settings
Note: Positions 6-7-8 must always be ON. The sequence shown
below must
be
followed to allow the system to address the
~
memory properly.
32 KB
1 2 3 4 5 6 7 8
96 KB
t
~LJu~LJDDD
64 KB
128 KB
t
~~~~~ooo
32 KB 32 KB
64KB 32KB
32 KB 32 KB
32 KB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
160 KB
t
[j[j[j~[jDDD
t
[j[j[j~~DDD
t
[j[j~[1uDDD
64
KB 64 KB
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
192
K8
t
[jLJLJ~[jDDD
t
[jLJ~LJ[jDDD
64 KB
32 KB 32 KB
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
192 KB
t
LJ[j~~[jDOD
t
[j[j~~[jDDD
t
[j~~[j~DDO
64 KB
64 KB
32 KB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
224 KB
t
u~[j~[jDDD t[j~~~~DDD
t
~~~~uDDD
64 KB
64
KB
64 KB
2-31