Need help or service manual for RS COCO mini disk 26-3022...

From: Don Maslin <donm_at_cts.com>
Date: Sun Oct 15 17:21:13 2000

On Sun, 15 Oct 2000, ajp166 wrote:

> From: Joe <rigdonj_at_intellistar.net>
>
>
> >>Coco were Shugart SA400s. That is a 35 track drive with the spiral
> groove
> >>disk. Allison pointed out that there was a later model (SA400L) that
> >>could handle 40 track. BTW, if you have decent machine shop
> capabilities,
> >>the SA400 could easily be modified for more tracks, but it is NOT a
> >>handheld Dremel task.
> >
> >
> > How many tracks can they be made to handle? Any details about how you
> go
> >about changing them?
>
>
> The number is 40 and it's at 48tpi. Te trick before the SA400L (40 tr)
> version
> was around was to mill the groove further and mill the end stop. Both
> were
> done at high precision. Or sub in the disk from the sa400L.
>
> It was done back in the days when 35 tr was passe` and 40 tracks were
> emerging as the standard for 5.25 floppies. It was a big deal then as
> with
> single density that meant another 12.5k on an 90k disk. If you had DD
> controller so much the better.
>
> Other common mods were to go to SA450s (40 cylinders two sides) or
> other far better drives.

455's?
                                                 - don
> Allison
>
>
Received on Sun Oct 15 2000 - 17:21:13 BST

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