User guide

5. UPDATE CONTROLLER CODE
This option allows one to update or initially install controller
code on the Corvus drive. This code resides on protected tracks
of the hard disk. Normally this code cannot be written to or
read by the user (even accidentally). However, it can be made
accessible (to writing) by turning on the format switch
(or by
adding a jumper to the drive backplane). This option replaces
the separate program:
CCODE.COM that had similar capa-
bilities.
WARNING
ON REV A DRIVES, DO NOT ATTEMPTTOWRITETHE CODE
OUT TO
THE DRIVE WITHOUT TURNING ON THE FORMAT
SWITCH (OR INSTALLING THE FORMAT JUMPER. IF YOU
DO, IT WILL BE WRITTEN OUT TO THE USER AREA OF THE
DISK-OVERLAYING POSSIBLY VALUABLE USER PRO-
GRAMS
OR DATA!
To use this option:
A. Power the drive down. If your drive has a format switch
(under the front bezel
or on the back of the drive), turn it
on and proceed to step
D.
B. On drives without a format switch, remove the plastic cover
over the backplane pins (on the back
of the drive where the
computer cable is attached).
C. Connect a jumper between pins:
037 and 038 (for Rev A drives)
C2 and C12 (for Rev B drives)
D. Power the drive back up.
E. Run the CDIAGNOS program from your floppy disk based
CP/M and select the update option.
F. After the code is written out, turn off the format switch (or
remove the jumper) and. reset the drive by either using the
reset switch
or by powering the drive down and up again.
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