On Mon, 17 Aug 1998 02:03:24 +0200 (CEST), wilson@dbit.dbit.com said:
 wi>>You may
 wi>>want to first try some experimenting with the PUTR program. I'm not
 wi>>sure, but if I understand the documentation right, it is possible
 wi>>to use it to read and write with a genuine RX50 drive connected to
 wi>>a PC floppy disc controller.
 wi>As the code stands now it shouldn't work (since the RX50 emulation
 wi>uses 1.2 MB 360 RPM drives at 300 kHz rather than genuine 300 RPM
 wi>drives at 250 kHz).  Nick Zymaris has experimented with this so he
 wi>would know more; I think the main problem (besides the data rate
 wi>which could be fixed by changing one table entry) is that RX50s use
 wi>a semi-normal cable pinout rather than the weird PC deal with the
 wi>separate motor enables for each drive (I think that's the main
 wi>difference, there may be others).  

If you connect a real RX50 to a PC only the bottom drive will work because
of the swapped around pins on the PC floppy interface. But that shouldn't
be too much of a problem, if one drive works that is sufficient for copying
disks. You even have a greater chance that it will work because the bottom
drive is usually used less often than the top one, so it should be in a
better condition anyway :)

I suggest if you change PUTR for driving real RX50s to forget about the
top drive, then it should be easy.

Kees

-- 

Kees Stravers - Geldrop, The Netherlands - pb0aia at amsat dot org
Sysadmin and DEC PDP/VAX preservationist - http://vaxarchive.ml.org

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