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 <email@example.com> 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> Message was sent through the cbm-hackers mailing list
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