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Cancel Transaction (cancel); Test Hp-ib Channel (channel); Channel Independent Clear (ciclear); Clear Logs (clear Logs) - HP 7942 Service Manual

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Service Information
7942 and 7946
4-30. CANCEL TRANSACTION (CANCEL)
The
CANCEL
command
causes
graceful
termination of most CS/80 transactions, leaving
them in the reporting phase.
4-31. TEST HP-IB CHANNEL (CHANNEL)
The CHANNEL command initiates a read and
write loopback test over the HP-IB channel.
4-32.
CHANNEL
INDEPENDENT
CLEAR
(CICLEAR)
The CICLEAR command will clear any command
connected to the channel.
4-33. CLEAR LOGS (CLEAR LOGS)
The CLEAR LOGS command- clears the run -time
data error log, the error rate test log, and the fault
log.
4-34. DESCRIBE SELECTED UNIT (DESCRIBE)
The
DESCRIBE command allows information
within the currently addressed unit to be sent to
the HP 85.
4-35. PERFORM INTERNAL DIAGNOSTICS
(DIAG)
The DIAG command invokes diagnostic routines
which reside in the internal device controller
firmware.
The
DIAG
command
has
three
parameter bytes. The first two of these bytes are
an integer loop count. The third byte is a
diagnostic test number. This command may be
directed to unit 15 (HOC) or unit 0 (disc drive).
If
the command is directed to unit IS, the valid
value range for
the diagnostic test
number
parameter is 0 through 3. These values correspond
to the following tests:
o
=
Full Run Time Self Test. Performs the
following three HOC tests as well as the unit
o
self test.
=
HOC RAM Test. Performs the two pass RAM
test on an empty lk data buffer. RAM
allocated to the units and/or the operating
system is not tested.
4-10
2
DMA Test. Performs the DMA test run at
power-on.
3
Timer Test. Performs the timer test run at
power-on.
If
the command is directed to unit 0, the valid
value range is also 0 through 3. These values
correspond to the following tests:
o
=
Unit 0 DOC power-on self test. This does not
include the HOC self test; however, the entire
power-on DOC self test is performed.
Random Seek Test. A total of 256 seeks are
performed per loop.
2
=
Full Stroke Seek Test. A total of 256 seeks
from outer diameter
(00)
to inner diameter
(ID) are performed per loop.
3
=
Incremental
Seek.
Performs
successive
one-track seeks from
00
to
10
and back
again.
4-36. OUTPUT ERROR RATE TEST LOG (ERT
LOG)
The ER T LOG command allows access to the error
rate test log which contains an accumulation of all
read errors which were found during a read-only
or write-then -read error rate test. Error rate test
errors are accumulated until the log is cleared
using the CLEAR LOGS command.
4-37. EXIT PROGRAM (EXIT)
The EXIT command causes the CS/80 external
exerciser program to exit.
4-38. OUTPUT FAULT LOG (FAULT LOG)
The FAULT LOG command allows access to the
fault log, an accumulation of the faults which
have occurred on the disc drive since the last time
a CLEAR LOGS command was issued.

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