On Mon, 20 Dec 1999, Richard Erlacher wrote:
> I can't imagine what's stopping you from reading the diskette, except that I
> don't believe it helps you to have so many drive types present on the
> CompatiCard. Having sold mine, I can't reproduce your results. However,
> it's not a bad idea to read the first two tracks into memory if you can read
> anything at all, then try to correlate it with a known-good image of the
> BDOS and CCP. That will tell you about the sector skewing, etc. Some
> vendors number the sectors sequentially yet read them out of numerical
> sequence, in order to improve performance. Others write the sector numbers
> in the optimal arrangement, which is not in sequence from 0. One other
> gotcha is that some systems require that the first two tracks on the
> bootable diskette be single density, yet the rest can be double density.
I have to echo Dick's comments, Bob. The approach that I like to take
when dealing with unknown disks or with an uncertain setup is to
attempt to read a number of tracks using AnaDisk. In the case of
unknown disks, this gives me the information that Dick spoke of. In the
case of uncertain setup, it dis/proves that it is usable/readable.
AnaDisk will also allow you to make a duplicate if that seems desirable.
> >From your lament, I'd say your problems are still more basic than that,
> however. If you havne't yet started on your rewiring task, I'd recommend
> you wire to the external DC-37 connector rather than the internal auxilliary
> 34-pin IDC cable connector. It'll not be easy to package an 8" drive
> internally in your PC, so it's best to use the more durable connector.
I agree here also.
- don
> If you have another CP/M box or access to one, you might be able to gain
> important information by examining the diskette on a CP/M box. You might
> even be able ot make a duplicate, though I've recently had trouble with
> that.
>
> Dick
> -----Original Message-----
> From: Bob Stek <bobstek_at_ix.netcom.com>
> To: Discussion re-collecting of classic computers
> <classiccmp_at_u.washington.edu>
> Date: Sunday, December 19, 1999 7:27 PM
> Subject: RE: 8" drives and Compaticard / Uniform
>
>
> >Thanks for the help, Richard and DOn. Another weekend and I still haven't
> >gotten the damn thing to read CP/M - either with Uniform or 22 Disk. I am
> >making up a new cable EXACTLY as specified in the Compaticard manual - I'll
> >let you know of any success (or continued failure!).
> >
> >Bob Stek
> >bobstek_at_ix.netcom.com
> >Saver of Lost SOLs
> >
> >-----Original Message-----
> >From: CLASSICCMP-owner_at_u.washington.edu
> >[mailto:CLASSICCMP-owner_at_u.washington.edu]On Behalf Of Don Maslin
> >Sent: Tuesday, December 14, 1999 6:11 PM
> >To: Discussion re-collecting of classic computers
> >Subject: Re: 8" drives and Compaticard / Uniform
> >
> >
> >
> >
> >On Tue, 14 Dec 1999, John Foust wrote:
> >
> >> At 09:36 PM 12/13/99 -0800, Don Maslin wrote:
> >> >On Mon, 13 Dec 1999, Bob Stek wrote:
> >> >> Dick (or anyone else) -
> >> >>
> >> >> Would you have the jumper settings (default positions, definitions,
> >etc.)
> >> >> for a Shugart 860? DS0-3 I can figure out. But the rest...
> >>
> >> <http://www.tardis.ed.ac.uk/~itda/frames.html> has an online PDF
> >> version of the Shugart 801 manual, if that might help...
> >>
> >> - John
> >
> >Hopefully, this will clear the fog a bit.
> >
> > - don
> >
> >
> > Shugart SA810/860
> > Customer Cut/Add Trace Options
> >
> > Trace As Shipped
> > Designator Description Open Short
> > U9 Terminations for Multiplexed Inputs Plugged
> > SI Internal Write Current Switch Plugged
> > SE External Write Current Switch X
> > TR True Ready Output Plugged
> > RTR Radial True Ready X
> > 2S Two Sided Status Output*** X
> > DC Disk Change Option X
> > S1 Side Select Using Direction Select*** X
> > S2 Side Select Input*** Plugged
> > S3 Side Select Using Drive Select*** X
> > 1B,2B,3B,4B Side Select Using Drive Select*** X
> > D Alternate Input In Use X
> > MS Motor On From Drive Select* Plugged
> > MO Alternate Input Motor On* X
> > MMO Alternate Input Multiplexed Motor On* X
> > MD Motor Off Delay X
> > R Ready Output X
> > RR Radial Ready X
> > SR Standard Ready Plugged
> > MT Modified True Ready (Output On Pin 22) X
> > DS1 Drive Select 1
> > DS2,3,4 Drive Select 2,3,4 Input
> > Y Door Lock Light Activated From Motor On Plugged
> > Z Door Lock Light Activated From Drive Select X
> > PD Stepper Power Down X
> > WP Inhibit Write When Write Protected X
> > NP Allow Write When Write Protected X
> > TS Data Separation Option Select X
> >
> > * Motor On is the complement of HEAD LOAD on the SA801/851 drives.
> > ** SA810/860 offers an optional data separatorwhich properly
> > separates data and clock bits through the soft sectored IBM
> > standard format and address mark area. TS offers the option.
> > *** Applies to SA860 only.
> >
> >
> >
> >
>
>
Received on Mon Dec 20 1999 - 12:37:40 GMT