IBM PCjr Hardware Maintenance And Service

The IDs "4" and "5" under the display symbol blink
all
the time. ID "8" blinks when the 64KB memory
and display expansion is present. A list of interfaces
and their locations follows:
Interface
Location
Compact Printer
Compact Printer
Diskette Drive
Diskette-drive adapter
Display
System board and 64KB memory
and display expansion
Graphics Printer
Parallel printer attachment
Internal modem
Internal modem
Joystick
System board
Keyboard
System board
Light pen
System Board
Memory
System board and 64KB memory
and display expansion
RS232
System board
Sound
System board
While the advanced-test menu is on yom screen, a
memory test is running continuously. The number
incrementing at the bottom of the screen shows what
segment of memory is being tested. If a memory failure
is
detected, the number stops incrementing and the
next to it is replaced by an error message. If this failure
occurs, make a note of the error message and go to PIC
"Memory."
2-13

IBM PCjr Specifications

General

Brand	IBM
Model	PCjr
Category	Desktop
Language	English