[Simh] DEC floppy disk interleave questions

[Hans-Ulrich Hölscher]

I'm very curious about what results the MOUNT/FOR & COPY method (under VMS) will show with RX01/RX02floppies.I would try myself, but my RX drive is out of order.I am confident in the virtues of VMS!Alan, let us know about your imaging progress.dd if=/dev/rx0 of=filename.img should work e.g. from ULTRIX-32 as well.By the way: when was "dd" invented?Ulli> -----Ursprüngliche Nachricht-----> Von: Leo Broukhis > Gesendet: Fr. 17.07.2015 20:48> An: simh at trailing-edge.com , > Betreff: Re: [Simh] Simh Digest, Vol 138, Issue 37>> On Fri, 17 Jul 2015 11:18:34 +0200, Hans-Ulrich Hölscher> wrote:>>>>>> That sounds like the really> easy way to do it.   Does it copy>> track 0 of RX01/02> floppies?> > I had some experience with RX01/02 floppies when> reviving LSX using> logical copies of> the disks. Track 0 will be logically at the very > end. The> problem is with media size 256256: if the> logical block size> is 512,  two physical 128-byte sectors (the> boot sectors) will be> lost, and the> logical copy will be 256000 bytes long.> > Leo>>>> I must admit I used my VMS MOUNT/FOR> & COPY method only with RX50 floppies and RD and RZ disks.>> Leo, what method did you use?>> I was quite sure my method catches ALL> sectors ...>> On some Unix V6, "od /dev/rx0" or similar was used, and the serial> console output was intercepted.> Disk devices are block devices (raw access to block devices not yet> invented, so no "/dev/rrx0" :( ), and the block size is 512, thus> only> 256000 bytes were returned.>> Leo

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