IBM Personal Computer User Manual

Switch Block 2
fDDDDD~~~~
" \
Switch Function
1,2,3,4,5 Amount of memory options installed
6,7,8 Always in the Off position
Notes:
1. The system board must be fully populated, 64KB of
memory, before a memory expansion option can be
installed.
2.
To expand the memory of your system beyond
544K requires your IBM Personal Computer System
Unit to have a BIOS
ROM module dated 10/27/82
or later. To determine the date of your ROM
module, run the following BASIC program. Type
the program exactly as shown.
10
DEF SEG=&HFOOO
20
FOR X=&HFFF5 TO &HFFFF
30 PRINT CHR$(PEEK(X));
40 NEXT
RUN
3. The date that is displayed is the date of your ROM
module. Contact your authorized IBM Personal
Computer dealer for a
ROM module if it is needed.
Switch Settings 5-9

IBM Personal Computer Specifications

General

Manufacturer	IBM
Model	IBM Personal Computer 5150
Release Year	1981
Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Graphics	MDA or CGA
Power Supply	63.5 W
Weight	21 lbs (9.5 kg)
Storage	5.25-inch floppy disk drives, optional 10 MB hard drive
Operating System	IBM PC DOS
Ports	Parallel, Serial, Cassette