Re: S100 Floppy Controller Question

I have a 1.2mb floppy drive at the ready for this. I'm sort of starting from
scratch with this floppy system so I'm missing some critical pieces -- like
a working system master disk.

The SD Sales controller I have supports an SA400 dive, so that's my
preference at this point. No mods appear to be necessary.

The CompuPro board also supports the SA400, but I only have a disk image
from an 8" system. So, I was going to connect a 1.2mb drive to the 8"
connector. But, the CompuPro requires mods to the IMSAI front panel which I
really don't want to do.

The Morrow board also only supports 8" drives, but no mods to the system are
required. I could probably connect the 1.2mb drive to this controller as
well, providing I had a disk image to work with.

If I could find a Versafloppy or Morrow disk image, that'd be ideal.


Thanks again.
Rich

On 11/11/07 10:15 AM, in article
473710cb$0$26408$88260bb3@xxxxxxxxxxxxxxxxx, "Greg" <retired@xxxxxxxx>
wrote:

Richard A. Cini wrote:
Following up, I just found a Morrow DiskJockey 2D/B in one of my boxes. This
model only has a 50-pin connector and the manual talks about the SA800, so
I'm assuming it's an 8"-only controller.



On 11/10/07 9:48 PM, in article C35BD796.105BC%rcini@xxxxxxxxxxxxx, "Richard
A. Cini" <rcini@xxxxxxxxxxxxx> wrote:

All:

Now that the weather in the Northeast is cold again, I¹m picking up on
some old projects, among which is a replacement working floppy system for my
IMSAI. I have an iCOM Frugal Floppy dual 8" system but only CP/M 1.4 and one
of the drives is flakey.

Here¹s what I really 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,
CompuPro Disk 1 and SD Sales Versafloppy (not II) controllers. 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 connection 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? In lieu of
that, I would take a working 8" CP/M 2.2 disk for the Frugal Floppy system.

Thanks again for any help.

Rich
--
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp


Wow, I just stopped in to browse old folks news and I see something like
this. Unfortunately, I haven't had a _P/M system up for a few years.
Maybe between turkey day and the end of the year I'll try to dig out one
of the fun systems from storage and hope no caps provide smoke and/or
light shows when powered up after the long hibernation ;-)

But as far as I can remember, the simplist thing to do is to make a
cable that just swaps the data and control lines around to match the 8"
signals to the floppies. Something is nagging me in the back of my mind
that there is just one line that can cause problems with some 5 1/4"
drives. I can't get the cobwebs quite cleared at the moment, it's been
a "few" years... I do know that I used to use lots of the frankencables
with mixed size drives ;-) It does help to have 5 1/4" drives that can
handle 80 tracks per side if you want to just use existing 8" table
information. CP/M 2 and later tables sure made it much easier to use
alternate and mixed 'disk' size/formats & configurations.

.

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