Need Shugart 851 manual

From: Richard Erlacher <edick_at_idcomm.com>
Date: Mon Mar 4 17:31:19 2002

I'd advise you to pursue this from the controller end, initially. If you see
that a line normally not connected between the controller and drive is driven
at the controller, or, just as importantly, is received in some meaningful way
at the controller, then you can, perhaps, by looking at the drive manual for
the SA80x type, figure out what they might have had in mind. I'd advise you
to start with the head select signal, since there's an even chance they didn't
even support two-sided drives.

In any case, if you examine the user-installable options, of which there are
several, in the 80x manual, you'll probably be able to figure out what the
Intel folks had in mind with their odd connections. Once you've figured out
what the desired options on the SS drive are, you look in the manuual for the
85x drives and set up the corresponding options. As I said before, however,
first you need to establish whether the Intel controller even supports the
two-sided drives. I don't believe I ever saw an M2FM arrangement on a
two-sided drive, not that it's complicated in any way.

Dick

----- Original Message -----
From: "Joe" <rigdonj_at_cfl.rr.com>
To: <classiccmp_at_classiccmp.org>
Sent: Monday, March 04, 2002 4:08 PM
Subject: Re: Need Shugart 851 manual


>
>
> At 07:58 PM 3/4/02 +0000, Tony wrote:
> >
> >I happen to have the 'Intellec Series II Microcomputer Development System
> >Double-Density Diskette Subsystem Schematic Drawings' here. (Phew, what a
> >title). I am not sure if this is the same unit that you have, but it
> >might provide some information. Unfortunately, I don't have any
> >information on the drives themselves -- there are no schematics or link
> >settings given. I do have info on the 2 multibus cards (controller), the
> >PSU, and the cabling.
>
> I have that manual for both the MDS 720 drive (two drives laying
> horizontally and using a double density controller) and for the older MS
> 2DS system (two drives mounted vertically and using the single density
> controller) and NEITHER of them says one word about the drives! It's
> amazing to me that intel would go to the level of detail that they do but
> completely ignore the drives!
>
>
> J1 P1
> (cable) (drive)
> Odd # Odd # Ground
> 2 46 Read Data
> 4 2 Not used (or even connected?) >> Not connected
> 6 42 Track 0
> 8 20 Index
> 10 16 Track <43 (is this really track > 43 ???) >>My
> docs say "< 43" also.
>
> Shugart says that pin 16 is an "alternate I/O" connector and it can be
> used for whatever the manufacturer decides. I've checked and it does
> connect back to the drive controller. So it's something else that I have to
> investigate.
>
> It's shown as track<43 on my schemaitc By the time it gets back the to
> the 'FDC Interface', it's become 'Track>43 01/' (or 'Track>43 23/' for
> the second drive cabinet). It's an output from the controller to the
> drive and seems to be the standard reduce write current signal.
>
> That's what I thought but I haven't had time to trace it all the way back
> to the controller yet.
>
> 12 36 Step
> 14 34 Direction
> 16 40 Write Gate >> intel calls it "write safe"!
> 18 38 Write Data
> 20 26,28 Select 0 ) Either cable pin can be jumpered to
> 22 26,28 Select 1 ) both drive pins by the S0/S1 jumper >>
> Correct.
> 24 4 Not used (or connected?) >> Not connected.
> 26 6 Not used (or connected?) >> Not connected.
> 28 22 Ready 0 ) Either cable pin can be jumpered to
> 30 22 Ready 1 ) drive pin 22 by the R0/R1 jumper
> >> Right. Drive pin 22 (Ready) can be jumpered to either ready line of the
> cable (pin 28 or 30)
>
> 32 10 Not used (or connected?) >> Not connected.
> 34 12 Not used (or connected?) >> Not connected.
> 36 44 Write Protect
> 38 48 Read Data (Separated) >> Not connected at P8.
> 40 14 Not used (or connected?) >> Not connected.
> 42 50 Read Clock (Separated) >> Not connected at P8.
> 44 18 Not used (or connected?) >> Not connected.
> 46 24 Not used (or connected?) >> Not connected.
> 48 30 Not used (or connected?) >> Not connected.
> 50 32 Not used (or connected?) >> Not connected.
>
> There are no components other than connetors on the PCB in the manual.
>
> Correct.
>
>
>
>
>
> I don't think you need to worry about that. The controller seems to use a
> 1-of-n active low drive select scheme (2 DS lines per drive cabinet
> cable), so you can just link each wire to a particular drive's active DS
> line.
>
> That's what I thought but I suspect there may be more to these. Shugart
> had some odd options available like "seek without selecting a drive" and
> "seek without loading the head" and this may be using one of those and that
> may explain why they did it this way.
>
> Joe
>
>
Received on Mon Mar 04 2002 - 17:31:19 GMT