[vcf-midatlantic] using catweasel to format an RX01

corey cohen coreyvcf at gmail.com
Thu Aug 10 07:29:43 EDT 2017

> 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.  

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