[Coco] 3.5" FD drives

[Al Hartman]

You are only going to be able to use these on a Coco as a 720k drive with 
DSDD 720k media. Unless you modify the Controller for HD operation, you 
won't be able to use them as 1.44mg drives with HD media.

I would not recommend using HD media and taping over the HD sense hole to 
reduce the writes to DSDD mode, you are asking for data loss over the medium 
to long term. No matter what anyone tells you, DD and HD media *IS* 
different, and is meant to take the data at different write densities.

As Mr. Scott was heard to say in one of the Star Trek movies, "Use the right 
tool for the right job!"

-[ Al ]-


-----Original Message----- 
From: dave

You are correct.  These drives don't even have the solder pads.  As far
as I can tell you'd have to do the select with the cable.

Dave Philipsen


On , Bruce W. Calkins wrote:
> I would expect (and don't mind being proven wrong) that drives of that
> late a manufacture would have solder pads.  Generally 2 sets 1 of
> which will have a solder bridge.  To change it over you would remove
> the solder and bridge the other set.  By that date it was rare to find
> the full 4 sets of solder pads, jumpers or a 4 position switch.  I
> snagged a few 3.5" drives decades ago that had a 4 position switch,
> but outside of my collection it has been a very long time since I've
> seen one.
>
> Bruce W.
>
>
>
> ----- Original Message -----
>
> From: "Dave Philipsen"
>
>> I'm not sure if they have jumpers.  I'll have to check at the shop later 
>> today.  Typically, this sort of drive selects by means of the ribbon 
>> cable.
>>
>> On 7/24/2015 8:54 AM, Kip Koon wrote:
>>> Hi Dave,
>>> What jumper settings are available?
>>>
>>> Kip Koon
>
>>>> -----Original Message-----
>>>> On Behalf Of dave
>
>>>>
>>>> I have 24 new old-stock floppy drives.  They are 3.5" 1.44MB drives 
>>>> made by NEC.
>
>>>>
>>>> Dave Philipsen
>
>
> ---
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