RX02 Difficulties

Jerry Weiss jsw at ieee.org
Sat Dec 16 15:21:05 CST 2017

 Glad to hear that you cleared that up.   

For the other floppies.

     If you share the listing that will give us some hints as to the OS on the floppies.

    will do a bad block scan to see if can read all of the blocks on the media.  It
    does not require an RT11 directory, despite the command name.  It uses
    the utility DUP.SAV with the K option, not DIR.SAV  You will hear the floppy
    reset if it sees a bad spot as it attempts a retry.  The number of retries
    is configurable via a SET command.

    For files with an RT11 Directory, DIR/BAD/FILES will include the file name
    of files affected by unreadable blocks.

You can do the same with the RL02 Drives.


> On Dec 16, 2017, at 2:28 PM, Aaron Jackson via cctalk <cctalk at classiccmp.org> wrote:
> I just checked all of them in RT-11, out of 12 floppies, two of them
> were bad, or at least I am unable to perform dir in RT-11.
> My source of confusion comes from both A) not being able to boot from
> any of them, and B) not being able to dump them using vtserver. The ones
> labelled RT-11 don't actually have RT-11 on them, just some random
> files, and these were the ones I had tried to boot from.
> I'm not sure why vtserver doesn't seem to work though. I have Kermit in
> RT-11, is there a way to dump the other drive over this? I would like to
> put LSI Unix on one of the floppies, can this be done with Kermit too?
> While on the topic of vtserver, it also doesn't seem to like my RL02
> drive. If I try to write to it or dump a cartridge, it tells me that it
> was unable to read the labelsector. About the thing vtserver has done is
> launch itself over odt.
> RT-11 is unable to list the files on the RL02 drive, but maybe they are
> UNIX or maybe they are dead packs...
> Thanks,
> Aaron.
> systems_glitch via cctalk writes:
>> We've gotten around the formatting issue by formatting SSSD using ImageDisk
>> on a regular PC (with a floppy controller that supports single density/FM,
>> of course). If you want RX02 media there's an XXDP routine to upconvert
>> RX01s to RX02s.
>> Thanks,
>> Jonathan
>> On Sat, Dec 16, 2017 at 2:02 PM, Chuck Guzis via cctalk <
>> cctalk at classiccmp.org> wrote:
>>> On 12/16/2017 10:43 AM, Fred Cisin via cctalk wrote:
>>>> On Sat, 16 Dec 2017, Aaron Jackson via cctalk wrote:
>>>>> Well, would you believe it. It was the disks after all. I can't believe
>>>>> they are all bad!
>>>> I can believe it.
>>>> Were they "bad"?
>>>> Or just not what they were labelled as being?
>>> I suspect that they weren't formatted to the 3740 spec (26/128 FM).
>>> ISTR that the RX02 doesn't have formatting abilities.
>>> The other possibility is that the disks were DS rather than SS
>>> (different index aperture position).
>>> --Chuck
> --
> Aaron Jackson
> PhD Student, Computer Vision Laboratory, Uni of Nottingham
> http://aaronsplace.co.uk

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