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5100 Diagnostics Overview
The IBM 5100 Portable Computer uses three types
of
diagnostic programs
to
check its internal functions:
• Bring up - runs
on
power up and when RESTART is
pressed.
•
RaS
resident - called
from
the keyboard.
• Tape resident - called
from
the keyboard.
The 5100 Portable Computer uses
two
diagnostic
control programs (DCP)-DCP1 and DCP2.
DCP1
is one
of
the
executable
RaS
resident programs and DCP2 is
one
of
the tape resident programs. The diagnostic
control programs provide the following functions:
• Load and execute diagnostic programs stored
in
RaS
and on the tape cartridge.
• Provide
two-way
communication through the
keyboard / display
for
selection
of
tests and options
and
for
displaying program initiated data.
• Provide communication through the keyboard/display
for
altering and displaying data.
The 5100 diagnostics begin
by
testing a small area
of
the machine and gradually expand
to
test the complete
system.
Each
diagnostic tests a specific area and
overlaps other tests. For example,
the
ROS
diagnostic
tests
ROS,
but because
RaS
contains the printer
microinstructions, some printer operations are indirectly
tested. The tests should normally be run
in
the
sequence shown on the
5100
Diagnostics Overview
Chart
in
this section. However,
in
the case
of
intermittent failures, this sequence can be altered
depending on:
The information you have concerning the failure
Whether or not this is the
first
call
How
frequent the failure occurs
Diagnostic Aids
5100 Diagnostics Overview 3-3
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