(
(
(
(
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MOl
820
Communications/Serial I/O
This
MOl
tests the communications/serial I/O features which
reside on
the
B2
card.
When
this
MOl
detects a failing con·
dition, it halts and displays
the
routine
that
failed. For
descriptions
of
these routines, refer
to
the
Communications
Adapter/Seriall/O Adapter
and
Diagnostic Routines.
MOl
820
Communications/Serial I/O
Tests: Communications/Serial I/O circuits
Analyzes
to:
Communications:
Timer interrupts
Data set ready
Clear
to
send
Data through the communications circuits
Long space interrupts
Serial I/O:
Timer interrupts
Data set ready
Clear
to
send
Data through the serial I/O circuits
Enter
MOl
840 Tape Read
Tests: Tape read without tape motion
Analyzes
to:
Status reset
Interrupt
Read check
MOl
844
Tape Read
Tests: Tape read with tape motion
-
MOl
840
Tape Read
This diagnostic has
two
parts:
1.
MOl
840
tests
the
tape unit without tape motion ..
2.
MOl
844
tests the tape unit with tape motion.
The chart on this page shows the relationship
of
MOl
840
through
MOl
847.
Be
sure
to
record
the
information
in
the
status bytes for
at
least the first failure
in
order
to
compare
status information with the
MOl
routine causing the halt.
Refer to
the
tape status byte information
in
this section.
MOls 840 and 844 cannot be looped together. To loop on
MOl
840, load
MOl
840 and remove the tape cartridge be·
fore running
the
MOL
Go
to
the option menu
to
set up
the loop. To loop on
MOl
844, load and run
MOl
844. Go
to
the
option menu
to
set up the loop.
MOl
840 and
844
can be run for both
the
internal
or
the
5106
Auxiliary Tape units. However, a confusion factor
exists since
all
references are
to
the
5106
Auxiliary Tape
unit. Also,
the
MOl
subsection has
to
be
loaded from the
internal tape unit and might
be
difficult
to
load depending
on
the
frequency
of
the
failure.
--.
841
- Cartridge
in
place
-
File protect
- LED, BOT,
EOT
•
842
- Erase
- Select magnets
843
- Interrupt
-
Data th rough tape control card
845
- Catridge
in
place
- Read data
- Customer error codes 002·014
846 -
BOT
-
EOT
- Tape speed
847 - Tape motion
Intermittent Failures Troubleshooting Guide 3-87
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