User guide
To
use this
option:
A.
Power the drive down. If your drive has a format switch (under
the front
bezel
of
the drive), turn it on and proceed
to
step
C.
The format switch is the second switch from the
right
under
the
bezel.)
B.
Power the drive back up.
C.
Run this program from your floppy based CP/M and select the
update option.
D.
After the code is written out, turn
off
the format switch and
reset the drive by either using the reset switch
or
by powering
the drive
down
and up again.
Note: There is a hidden option within this option that
allows the
drive to be reformatted and the
controller code replaced. This
should only
be
done
as
a last resort and
under
the
direct
supervi-
sion
of
Corvus Customer Service personnel. This is because the
format operation destroys data in the firmware area
as
well
as
in
the user area.
7. LIST/MODIFY DRIVE PARAMETERS
This option allows the examination and/or change of the follow-
ing:
7
A.
SPARED TRACK TABLE
This
table specifies physical track numbers which are
to
be
skipped over when the controller accesses data on the drive. This
allows the hiding
of
the existence
of
media defects from the
external user. (The data surface will look
perfect
to
him.)
7B.
SECTOR INTERLEAVING SPEC.
The defaults used here have been optimized
for
small com-
puters like the TRS 80 Model
II.
Typically, we have selected a value
of:
9
for
the 10 and 20 megabyte drives
12
for the 5 megabyte drive
7C.
VIRTUAL DRIVE TRACK OFFSET TABLE
This
table allows one drive
to
behave
as
if
it were several smaller
drives daisy-chained together. The table entries specify the track
number where these
virtual drives start.
Normally,
there
would
be
no
occasion
to
disturb
these
parameters unless the drive has been reformatted or a bad track
develops.
3-5