[vcf-midatlantic] using catweasel to format an RX01

william degnan billdegnan at gmail.com
Thu Aug 10 14:32:08 EDT 2017


exactly.  and given I have only an RX01....but I take it no one who replied
to my post ever used a catweasel to format a disk for use in an rX01 then.
I may try anyway, if I have time.

On Thu, Aug 10, 2017 at 10:23 AM, systems_glitch via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> There's an XXDP routine to upconvert an RX01 disk to RX02 format, you still
> have to do the initial RX01 formatting on something else though.
>
> Thanks,
> Jonathan
>
> On Thu, Aug 10, 2017 at 10:15 AM, william degnan via vcf-midatlantic <
> vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
>
> > On Thu, Aug 10, 2017 at 7:29 AM, corey cohen via vcf-midatlantic <
> > vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> >
> > >
> > >
> > > > On Aug 10, 2017, at 6:50 AM, Ian Primus via vcf-midatlantic <
> > > vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > > >
> > > > Yes - it has to be single density. Just about any CP/M system with 8"
> > > > disks should be able to format single density ones. The IBM 3740
> > > > format was kind of the standard interchange format - a lowest common
> > > > denominator that most systems could handle. There is an XXDP utility
> > > > that can be used to update such disks to RX02 format - requires an
> > > > RX02, of course. I do not believe there is anything to go the other
> > > > way. The DEC RX02 format is special and weird. It uses the same base
> > > > single density formatting, using single density sector headers with
> > > > double density data areas. As such, really nothing else can create
> it.
> > > > My method for creating RX02 media has been to format blank disks as
> > > > single density on something else, then use the XXDP util to update
> > > > them to RX02.
> > > >
> > > > I'm sure you can format RX01 disks with a Catweasel, I just have no
> > > > idea how this is done. I don't have a Catweasel and have never seen
> > > > one. You can, however, use ImageDisk and a compatible PC controller
> to
> > > > format single density disks - which is a method I've used to get RX01
> > > > blanks as well.
> > > >
> > > > -Ian
> > > >
> > > > On Wed, Aug 9, 2017 at 11:59 PM, william degnan via vcf-midatlantic
> > > > <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > > >> As long as it's single density though. Right?  Not sure if I have a
> > cp/m
> > > >> system w/ single density 8" drives.  I'll have to check.  Thanks for
> > the
> > > >> tip.  Of anyone going to then workshop has any I will trade rx01 for
> > > rx02.
> > > >> i have a lot of tx02's
> > > >>
> > > >> On Aug 9, 2017 10:04 PM, "Ian Primus via vcf-midatlantic" <
> > > >> vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > > >>>
> > > >>> If you have any CP/M machine that uses 8" disks, you can use that
> to
> > > >>> format blank RX01 media. It's just IBM 3740 SSSD - at least, in the
> > > >>> low level. Then you can do the high level formatting on the DEC
> > > >>> machine.
> > > >>>
> > > >>> -Ian
> > > >>>
> > > >>> On Wed, Aug 9, 2017 at 8:43 PM, william degnan via vcf-midatlantic
> > > >>> <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> > > >>>> Anyone ever formated an 8" disk to be used in an RX01 using a
> > > catweasel
> > > >>>> controller?  Curious if it's worth trying this route.  I have a
> > Tandon
> > > >> 848
> > > >>>> drive.
> > > >>>> Bill
> > >
> > > Not sure I'm following here, but are you saying he just needs a cp/m
> > > formatted disk and can convert it to RX02 on the RX02?
> > >
> > > Is the RX01, hard or soft sectors?  If Hard then I can make a bunch of
> > > C/PM formatted 8" disks for him, I have CP/M for my Helios.
> >
> >
> >
> > Corey,
> > My question was essentially, "has anyone formatted an 8" disk to IBM 3740
> > format using a catweasel?  I don't think it's necessary though.
> >
> > Assuming your Helios drive is a Percsi 277 yes it can produce IBM 3740
> > format disks, but you may have to specify this as part of the format
> > process.  IBM 3740 format may be called "FM" SSSD (?) or they may ask you
> > to specify 77 tracks 26 sector per 128 byte --> 256k bytes).
> >
> > If it's easy for you to make these disks because you're already set up,
> > that'd save me the trouble of setting up a system here but it's not
> > necessary.  If you do let me know so I can bring you new SSSD disks in
> > exchange for the ones you make for me, please advise.  I have an XOR S-4
> > S-100 sysytemthat I can format the disks with, I believe it'll do IBM
> 3740
> > format, or worst case I can set up a Shugart 801 onto something.  I just
> > wanted to see if the catweasel could do it too because I already have
> that
> > set up, I was just getting started playing around with it.
> >
> > NOTE:   I have RX02 disks if anyone wants a couple, I don't have an rx02
> > drive.  I can bring to the workshop.
> >
> > I got a request to bring my Lear Siegler ADM3a terminal box to the
> workshop
> > (I offered to give it away) but it's too big for my car and passengers to
> > fit.  Joe O has first dibs, but it's first come first served but you have
> > to come here to get it.  If I don't get any takers soon I will use the
> box
> > for something else.
> >
> > Bill
> >
>



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