17 Mar
2014
17 Mar
'14
1:25 p.m.
----- Original Message -----
Date: Sun, 16 Mar 2014 13:19:10 -0700
From: Chuck Guzis <cclist at sydex.com>
On 03/16/2014 12:42 PM, Steven Hirsch wrote:
------ Reply:-----
Any chance it has a jumper setting that puts it into double-step mode and
emulates a 'normal' 40 track drive (albeit with a narrow head)?
AFAIK RPM and current would be the same.
Question remains: Why is it doing this? Are both
drives defective?
I doubt it--lots of Tandy enthusiasts have used these drives for years.
I'll think on it, but do you have the termination pack installed if this
is the only drive on the cable? Sometimes you get odd effects if the
terminator is omitted.
--Chuck 
17 Mar
17 Mar
1:55 p.m.
On 03/17/2014 10:25 AM, MikeS wrote:
Any chance it has a jumper setting that puts it into
double-step mode
and emulates a 'normal' 40 track drive (albeit with a narrow head)?
AFAIK RPM and current would be the same.
I suppose that it's possible--certain MPI drives could do this.
Unfortunately, configuration (jumpers) for the FD50A is pretty hard to
come by, so it's difficult to say with any sort of certainty.
--Chuck
18 Mar
18 Mar
7:14 a.m.
On Mon, 17 Mar 2014, MikeS wrote:
----- Original Message -----
Date: Sun, 16 Mar 2014 13:19:10 -0700
From: Chuck Guzis <cclist at sydex.com>
On 03/16/2014 12:42 PM, Steven Hirsch wrote:
------ Reply:----- Question remains: Why is it doing this? Are both
drives defective?
I doubt it--lots of Tandy enthusiasts have used these drives for years.
I'll think on it, but do you have the termination pack installed if this
is the only drive on the cable? Sometimes you get odd effects if the
terminator is omitted.
--Chuck Any chance it has a jumper setting that puts it into
double-step mode and
emulates a 'normal' 40 track drive (albeit with a narrow head)? AFAIK RPM and
current would be the same.
Could be, but that doesn't explain why it seems to single-step when a
train of pulses arrive at the max rate, yet double-step when they arrive
individually.
I really hate to write off these two drives. They are incredibly clean
units, probably NOS and were top of the line in their day.
Steve
--
1:09 p.m.
On Tue, Mar 18, 2014 at 07:14:36AM -0400, Steven Hirsch wrote:
[...]
Could be, but that doesn't explain why it seems to
single-step when a train
of pulses arrive at the max rate, yet double-step when they arrive
individually.
It's probably ignoring pulses that arrive while it's double-stepping.
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