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Hi Wayne,
additionally I want remark that I have used a modified
1.44MB diskette.
After formatting with FDTST I have made a VERIFY ->
DISK. And when errors occured, I have continued with I(gnore) .
Result is - I can definitely say - that head 0 is
cleanly able to read the sectors.
The errors take place as soon as head 1 is
used.
One question for understanding:
Why is a 720K disk written the same way as a 1.44MB
disk?
I mean: both use 4F tracks, 09 sectors and 2 heads. Or
is the write density different? Up to now I always thought that 720K only uses 1
head.
Thanks,
Norbert
Sent: Tuesday, June 12, 2012 4:07 PM
Subject: Re: [N8VEM: 13811] Re: Zeta SBC working!
It is theoretically possible you have one head that is "bad".
The thing about the format command is that it will complete fine even if
it has failed to correctly format the disk. There is no "checking" in the
format function.
Basically, I suggest you format the entire disk, then attempt to read
sectors back being sure to try different sector numbers, track numbers, and head
numbers. I would like to know if ANY of the reads seem to work.
I would like to see the log of another session at this point if that is
convenient.
Thanks!
Wayne
On Monday, June 11, 2012 10:47:41 PM UTC-7, Norbert Joppen wrote:
Hi Wayne,
I'm just on my work and I'm afraid I
cannot test :-[ . So in the moment I cannot answer your question.
Yesterday night I continued testing a bit. I noticed the following
behavior:
when trying to format and then read a defined track/sector a
read problem seems to appear when a certain head is used. In the moment I
don't know which of the two it exactly was.
Thanks,
Norbert
-------- Original-Nachricht --------
> Datum: Mon, 11 Jun 2012
22:15:17 -0700 (PDT)
> Von: Wayne Warthen <wwar...@gmail.com>
> An: n8...@googlegroups.com
> Betreff: Re: [N8VEM: 13806]
Re: Zeta SBC working!
> Yes, it is definitely normal.
>
> I may not be following all of the threads of discussion on this,
wanted to
> ask something else.
>
> I understand that the
format is completing OK in FDTST. I also understand
> that there
are errors when you try to access the disk with CP/M. However,
>
what happens when you try to use the READ command in FDTST? Does that
> work?
>
> Thanks,
>
> Wayne
>
> On Monday, June 11, 2012 11:24:29 AM UTC-7, Norbert Joppen wrote:
> >
> > Hi Sergey,
> >
> > one more
notice: is it normal that - when fdtst is formatting - the
> >
'track'
> > increments, the 'head' changes from 0 to 1 , but
sector remains on 1 ?
> >
> > Thanks norbert
> >
> > --------------------------------------------------
>
> From: "Sergey" <skis...@gmail.com>
> > Sent: Monday, June 11,
2012 6:52 PM
> > To: "N8VEM" <n8...@googlegroups.com>
> > Subject: [N8VEM:
13794] Re: Zeta SBC working!
> >
> > > Hi Norbert,
> > >
> > > You've mentioned that you are able to
format a disk for 720 KB but
> > > then you can't read it from
CP/M. I am wondering if you're using a
> > > real 720 KB diskette
(or a "patched" 1.44 MB diskette with "high
> > > density" hole
covered), or an unmodified 1.44 MB diskette.
> > >
> >
> If I remember correctly, FDTST will successfully (without errors, not
> > > sure if the disk itself gets properly formatted) format a
1.44 MB
> > > diskette as 720 KB, but then it won't be possible
to read it.
> > >
> > > You should either use 1.44
MB diskette and setup FDTST to 1.44 MB, or
> > > 720 KB diskette,
and setup FDTST to 720 KB (which is the default).
> > > Note that
1.44 MB support requires 6 MHz or faster CPU clock.
> > >
> > > Thanks,
> > > Sergey
> > >
> > > --
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> >
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