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operational diskette. See
working diskette.
POST. Power-On Self Test. A
series of diagnostic tests that are
run each time the computer's
power is turned on.
Problem Isolation Chart
(PIC). A diagnostic procedure
for finding problems with an IBM
Personal Computer or its
adapters.
read-only memory (ROM). A
computer's storage area whose
contents cannot be modified.
ring network (or ring). A
network configuration where a
X-4
series of attaching devices, such
as IBM Personal Computers, are
connected by unidirectional
transmission links to form a
closed path.
upstream. On a ring network,
the direction opposite to that of
data flow.
working diskette. A computer
diskette to which files are copied
from an original diskette for use
in everyday operation.
wrap plug. The connector that
is attached to an adapter during
testing, to directly join the
transmit and receive lines of the
adapter. Using the wrap plug
instead of the adapter cable can
help determine whether a
suspected problem is in the
adapter or in the cable.
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