From: B. Degnan (billdeg_at_degnanco.com)
Date: 2007-03-22 13:07:24
Is there anyone here who has successfully replaced the original Tandon 602s
with an ST-506 brick in their CBM D9060? The specs seem to indicate that
these are compatible drives. There is a sprinkle of posts on the web here
and there about replacing the Tandon drives on the 9090/9060, but I did not
find anything specifically about an actual ST-506 as a successful
replacement. I have successfully replaced the 602s with an ST-225, but
it's a 1/2 height drive which makes it hard to fit everything back into the
chassis. The 506 is a better fit. I would prefer to use the 506. The
cylinders and heads on both drives are 153/4 according to Internet sources.
I have 8 NOS St-506's, so far the first two have not formatted on the CBM
"D9060".
Background:
When I install an ST-506 drive and enter ?ds$ I get the "73" OK code, the
controller, etc. are OK. To install the 506 I removed a working/booting ST
225; I have confidence in the hard drive controllers/power/cables.
I was able to get both 506's to pass diagnostics in an IBM XT, but so far I
could get neither to format on the XT. Could be partially functional
drives/bad luck? Watching the formatting, my XT HD controller looks for a
154th cylinder and then the process bombs. I am not sure if the ST-506,
being only 5MB, is too old for the XT controller, but I can't imagine that
the controller is not able to handle the 506. It's an orig stock IBM XT
controller. Do I have bad drives? Try a third drive?
I have more drives to try, but I thought I'd ask before I unpack another
506 for experimentation.
One last thing...I call this a "D9060" because I snipped jumper J14 on the
controller to change from 6 to 4 cylinders.
Bill D
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