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
12345678
96 KB t ~LJu~LJDDD
64 KB
128 KB t ~~~~~ooo
32 KB 32 KB
64KB 32KB
32 KB
32 KB
32 KB
12345678
12345678
12345678
160 KB
t [j[j[j~[jDDD
t [j[j[j~~DDD
t [j[j~[1uDDD
64 KB 64 KB
12345678 12345678
192 K8 t [jLJLJ~[jDDD t [jLJ~LJ[jDDD
64 KB
32 KB
32 KB
12345678 12345678 12345678
192 KB
t LJ[j~~[jDOD
t [j[j~~[jDDD
t [j~~[j~DDO
64 KB
64 KB
32 KB
12345678
12345678
12345678
224 KB
t u~[j~[jDDD
t[j~~~~DDD
t ~~~~uDDD
64 KB 64 KB
64 KB
2-31

IBM 5150 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Manufacturer	IBM
Model	5150
Release Year	1981
Storage	5.25-inch floppy drives
Graphics	MDA or CGA
Operating System	IBM PC DOS
Ports	Cassette, keyboard
Expansion Slots	5