IBM PCjr Hardware Maintenance And Service

You have a memory problem.
1. Set the system unit's Power switch to Off.
2. Replace the 64KB memory and display expansion.
3. Perform advanced POST.
The IBM Personal Computer Basic
Version 01.20 Copyright IBM Corp.1981
XXXXX Bytes free
OK
~ +@-
mSl 2l:ll]?B 5 finTTia
V >
DO CHARACTERS OR SYMBOLS RANDOMLY
APPEAR ON YOUR SCREEN?
YES The system board is bad. Replace it.
Reinstall the original 64KB memory and
display expansion.
Repeat advanced POST and the advanced
tests to ensure that the IBM PCyr is operating
correctly.
The problem has been corrected. Repeat
advanced POST and the advanced tests to
ensure that the IBM PCyr is operating
correctly.
Display 3-500-3

IBM PCjr Specifications

General

Brand	IBM
Model	PCjr
Category	Desktop
Language	English