S100 Floppy Controller Question

Grant Stockly grant at stockly.com
Sat Nov 10 19:16:30 CST 2007

At 02:09 PM 11/10/2007, you wrote:
>     Now that the weather in the Northeast is cold again, I¹m picking up on
>some old projects, among which is the floppy system for my IMSAI.
>     Here¹s what I want ‹ a 5.25² dual-disk system running CP/M 2.2 (my IMSAI
>has a Z80 board in it).
>     Here¹s what I have ‹ plenty of 5.25² TM100 and equivalent drives, a
>CompuPro Disk 1 and an SD Sales Versafloppy (not II). The Versafloppy
>specifies SA400/450, but I think other 5.25² drives will work.
>     Here¹s what I don¹t have ‹ a working disk image for either of the above.
>Dave Dunfield has a disk image for a Disk 1A but it¹s from an 8² original.
>Also, the ComprPro controller seems to require modifying the IMSAI front
>panel to disable it (by removing the ground on pin 20 IIRC). I really don¹t
>want to modify the front panel. I browsed the Versafloppy manual quickly and
>it doesn¹t seem to require modifications to the host machine.
>     Given this, does anyone have a Versafloppy image I can use?
>Alternatively, I¹d gladly trade what I have for a board/disk that would
>work. I would even consider trading other stuff for it, including the 8²
>drive system I have that is the bane of my existence.

I have some of those cards too, but no images either.

I hope you have more luck than me.  I'm about to 
get out the big guns and hook up a logic analyzer 
to the disk drive.  It doesn't seem to be reading sectors reliably.  : (


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