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15.
Read track N.
16.
Receive from fast comm and write to disk.
17.
Read from disk and send via fast comm.
18.
Reserved.
19.
Reserved.
20.
Reserved.
21.
Report on unreadable blocks.
22.
Compare RS-422 input to local disk.
23.
Surface test.
24.
DMA load test.
25.
Sort BBT.
Again, note that subtest 15 is used only to test the floppy disk.
Subtest 1:
Subtest 2:
Subtest 3:
Subtest 1, Recal (recalibrate), initializes
the disk, brings the head back to the
beginning of the disk (sector 0), and tries
to read and verify the first two blocks of
the disk.
The first block is the volume
home block (VHB), which contains descriptive
information (number of cylinders, number of
tracks per,cylinder, and number of sectors
per track), and the second block contains
the bad block table (BBT).
result in a number of error conditions, but
the two most common are Response=4 (Can't
recal) and Response=l (Can't read the volume
home block).
Subtest 2, Format, is more a utility than a
diagnostic.
First, subtest 2 performs
hardware formatting of the disk.
writes all the sector headers on the disk
and the volume home block according to your
specifications, and any bad blocks
discovered.
This subtest prompts for header
information for the volume home block, and
an operator should be present at the
terminal to enter this information.
Subtest 3 writes sector address data over
the entire disk and then performs a
check/read to make sure it read the same
data it wrote.
3 allows you to specify the data pattern in
hex, the start block, the number of blocks
to transfer, the maximum transfer size, and
the number of subtest repetitions.
unattended mode, the subtest runs using
defaults.
The default pattern is a
generated address pattern based on where you
are in the disk.
writes over the entire disk, reading the
data after it has been written (in
Tests and Subtests
Subtest 1 can
In interactive mode, subtest
By default, subtest 3
Next, it
In
2-9
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