From: B. Degnan (billdeg_at_degnanco.com)
Date: 2006-07-02 23:31:07
I just opened up the drive and found J14. As I was about to cut J14 I
decided that I am ready yet to make this change ... I would rather try to
find a 6 head drive first. I am patient and I would like to get the full
7.5 MB's if I can. I am not 100% sure that my ST-225 works, and then I
would have circumcised the drive controller for no reason. :-)
A while back I tried using a Miniscribe 3650 that I was given from a
reliable source, who described it as working. I read someplace that this
drive was used to replace a tandon 603s successfully. This drive has 6
heads and 809 cylinders. When I format it starts out OK (you can hear the
click click click for about a 1/2 hour, and then it just spins with no
further format activity. I am aware that it can take quite a while to
format a d9090 drive, but after 5 hours I pulled the plug. Perhaps the
drive had a defect. Is there a header command that stops the formatting
process at a pre-defined number of cylinders?
Do I understand correctly that the ST-225 is a straight substitute for the
Tandon 602s D9060 "out of the box", and that no drive controller changes
are needed?
I will see if I can dig up a working 6-head ST 251. I may also be able to
get a Tandon TM603SE.
One last question...I use this command to check the drive
?ds$
I get the response code 73 and the DOS version. Is there anything else I
can do to make sure that the controllers are working? Maybe I have been
barking up the wrong tree.
Bill D
At 05:49 PM 7/2/2006 +1200, you wrote:
>On 7/2/06, Anders Carlsson <anders.carlsson@sfks.se> wrote:
>>Bill Degnan wrote:
>>
>> > Theoretically you do not have to do anything to the drive if you swap
>> > a 603s for a 602s. If you use a 602s, you in effect convert a d9090
>> > into a d9060, and the capacity is reduced to 5MB.
>
>The only difference between a D9060 and D9090 is the specific drive
>mechanism installed, the position of a jumper (see below), and the
>sticker on the outside. One of the drives I have at home was sold to
>me for a pittance because it "wouldn't format" - someone had replaced
>the TM603S with a TM602S and failed to move the jumper. Quick fix.
>;-)
>
>>The ftp index on this page says:
>>
>>"The jumper J14 on the DOS board is open in the D9060, and closed in
>> the D9090 to select a 4-head vs. 6-head drive."
>>
>>http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/index.html
>>
>>Maybe that's what you are missing if you tried a 4-head ST-225 with a
>>D9090 drive?
>
>That will certainly fail to format. Try an ST-251 for a 6-head
>drive... those are almost as common as the ST-225 (they shipped
>standard with the original IBM PC-AT). Of course, having a 5MB PET
>hard disk isn't so bad, especially since they don't have
>sub-directories.
<snip>
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