9 Jan
2012
9 Jan
'12
7:39 p.m.
> (Now I just have to figure out why I can't get the FDC to write
floppies
correctly...)
Can you describe the problem in detail? I recall that you're using a 16FDC
with 8" drives that are not Persci brand. Are you aware that the 16FDC 8"
bus is wired differently than what is required for Shugart compatible
drives? The Persci drives did not have a TG43 signal so the write current
may be too high on the inner tracks of a non-Persci drive mated to a 16FDC
-- causing errors.
Fortunately, it is possible to modify a 16FDC to be compatible with a
couple of cuts and jumpers. I have some photos and text that describe the
mod.
Should this happen to be the problem you're experiencing, I'll upload the
mod info to a site and send the link. If not, please describe what problem
you are having in more detail.
Amardeep
9 Jan
9 Jan
7:53 p.m.
Amardeep S Chana wrote:
Can you describe the problem in detail? I recall that
you're using a
16FDC with 8" drives that are not Persci brand. Are you aware that
the 16FDC 8" bus is wired differently than what is required for Shugart
compatible drives? The Persci drives did not have a TG43 signal so the
write current may be too high on the inner tracks of a non-Persci drive
mated to a 16FDC
-- causing errors.
Fortunately, it is possible to modify a 16FDC to be compatible with a
couple of cuts and jumpers. I have some photos and text that describe
the mod.
I have always found it interesting how quickly people will go chopping
up circuit boards. Before you do this, consider chopping up a ribbon
cable instead. Ribbon cables are cheap and easy to replace if you
later change to a different make of drive or if you simply screw up
making the modification. I run SA-851's on my 16FDC with a simply
modified ribbon cable.
7:57 p.m.
Bill Sudbrink wrote:
I have always found it interesting how quickly people will go chopping
up circuit boards. Before you do this, consider chopping up a ribbon
cable instead. Ribbon cables are cheap and easy to replace if you
later change to a different make of drive or if you simply screw up
making the modification. I run SA-851's on my 16FDC with a simply
modified ribbon cable.
By the way, based on your description of the symptoms, I still suspect
the 1793 is going bad.
10 Jan
10 Jan
6:25 a.m.
On 1/9/2012 11:39 AM, Amardeep S Chana wrote:
I have both a 16FDC and a 64FDC (for the moment) and right now I have it
wired to a single 5.25" drive (w/proper termination). I've tried three
different drives -- a Tandon TM-100, an unmodified 1.2M 5.25" drive, and
one that's modded to spin at 300rpm. Same exact behavior on all three.
> (Now I
just have to figure out why I can't get the FDC to write
floppies
correctly...)
Can you describe the problem in detail? I recall that you're using a 16FDC
with 8" drives that are not Persci brand. Are you aware that the 16FDC 8"
bus is wired differently than what is required for Shugart compatible
drives? The Persci drives did not have a TG43 signal so the write current
may be too high on the inner tracks of a non-Persci drive mated to a 16FDC
-- causing errors.
That's good to know for when I do attempt to hook up an 8" drive -- thanks!
- Josh
Fortunately, it is possible to modify a 16FDC to be compatible with a
couple of cuts and jumpers. I have some photos and text that describe the
mod.
Should this happen to be the problem you're experiencing, I'll upload the
mod info to a site and send the link. If not, please describe what problem
you are having in more detail.
Amardeep
4808
days inactive
4809
days old
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asc135＠gmail.com -
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