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-If these checkout steps have been successful, then the ZPB has
successfully done an auto-jpmp and executed a simple program.
Therefore, most of the circuits on the ZPB have been tested.
The
ZPB should now have its configuration options set.
Be sure to
remove all special jumpers added during the checkout.
It is then
ready to be used in conjunction with the other boards in the
computer system.
If the PROM option is being used, install it at
this time.
\
If the board is still failing then the problem maybe a result
of any of the following less likely conditions: dirty edge
connector contacts, bad Rarts other than the IC's, bad
connection in an IC socket, or introduction of a short or open
in the traces on the board.
Diagnosis of a problem in a-previously operational board will
usually be successful using the following procedure:
-
- I-
I. Determine that the ZPB is in fact the board that has the
problem by attempting to\use it in another computer.
-2. Check that the regulator-outputs are correct.
Then, in an
ord~rly
.fashion begin replacing IC's in the ZPB with known
good paE-ts until the problem disappears.
If a board that was
working has not been subjected to any abnormal abuse then an
IC failure will be the cause of the problem in nearly every
case.
19
-North Star Z80A PROCESSOR BOARD
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