Epson QX-10, CP/M

From: jpero_at_pop.cgocable.net <(jpero_at_pop.cgocable.net)>
Date: Sat Jul 25 11:52:54 1998

> Date: Sat, 25 Jul 1998 17:14:46 +0100 (BST)
> Reply-to: classiccmp_at_u.washington.edu
> From: ard_at_p850ug1.demon.co.uk (Tony Duell)
> To: "Discussion re-collecting of classic computers" <classiccmp_at_u.washington.edu>
> Subject: Re: Epson QX-10, CP/M


> No, it's a true voice coil (I have a schematic in front of me). There's a
> Voice Coil Motor (VCM) that consists of a driving voice coil, a velocity
> feedback coil and 3 photodetectors : track 0, and a pair of position
> error signals.
Snipped of it's juicy descriptions...how interesting! Now I see what
you meant.

Suppose, you have a floppy disk completely blank no tracks, just
spanking new one and try to format that in this?
I wondered how it knows it's right distrances between tracks and so
on.

> It certainly isn't a linear stepper.

Okay!

> The same drives IIRC are used in the TF20 floppy drive for the HX20, BTW.

Whatever, I have not seen anything like this drive in my experience.
What machines did use these type with that neat voice-coil head
positioner? I find this voice-coil idea very reliable than stepper
themselves.

Jason D.

>
>
> -tony
 
Jason D.
jpero_at_pop.cgocable.net
Received on Sat Jul 25 1998 - 11:52:54 BST