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Model 64100A - Performance Verification
e. RAM test is
initiated;
if a failure
occurs an SA loop is
entered and the
failing
RAM
IC number is displayed.
NOTE:
The display may be unreadable due to a display
RAM
failure.
If this occurs
then go
to the Display tab, section IV, SA
loop E to troubleshoot.
f. Read rear panel dipswitches and boot accordingly.
4-9.
POWER-UP ROM TEST.
Purpose:
The ROM test
verifies that all
of the firmware in ROM used for boot-up and
performance verification is good.
The test also checks that the CPU is able
to access ROM memory via the bi-directional address and data busses.
Area Tested:
All ROMs,
the
latches
data
c ircui try, and
Operation:
multiplexed memory
Address/Data
bus
to ROM,
buffers,
the
CPU and
its
associated
timing
the demultiplexed Address/data bus to/from ROM.
the
and
address
control
a. This test
executes a
checksum on each of
the~OMs
as long as the kernal
of ROM needed to run the test is operational.
b. If an error is detected, then a bit is set in an error mask.
c. The error mask is then used to output
an error message to
the screen:
stating a ROM failure, the address range of the failure,
and the byte (0
or 1).
d. If a
failure is
detected,
the
test will loop
continuously.
section IV for more information.
See CPU
e.
On
failures,
the
power
up ROM test
will display the
following
error
message assuming that the kernal of ROM required to run the power up test
is good:
SELF-TEST FAILURE
<-------- [
blinking
ROM TEST:
FAILING ADDRESS RANGE
BYTE(S)
xx
f. Use the table below to determine which ROM unit number is failing.
Note
that the error message
might
give an
address
range that includes more
than one ROM.
SA might be necessary to isolate the fault.
MF 4-3
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Troubleshooting
