Ethan,
John M.B.Wilson, creator of the Ersatz-11 PDP11 emulator wrote a program
fdcdemo that one can use use to create and duplicate RX50 floppies
on a 1.2 Mb drive using low density (360 kb) floppy disks. The program was
available on his site. Mind, you need a proper floppy disk controller with
more than one crystal but this is explained in the documentation of the
program.
Wim Hofman
----- Original Message -----
From: Ethan Dicks <erd_6502_at_yahoo.com>
To: <cctalk_at_classiccmp.org>
Sent: Friday, June 21, 2002 4:15 PM
Subject: RE: What's the best way to slurp up DEC RX50s?
>
> --- Pat Finnegan <pat_at_purdueriots.com> wrote:
> > On Fri, 21 Jun 2002, Antonio Carlini wrote:
> > > (If anyone has suggestions for "imaging" 360KB
> > > floppies, 1.2MB floppies and RX50s using PC hardware
> > > running Windows or Linux or NetBSD, I'm all ears.
> >
> > 1) If it's a true 360K or 1200K 5.25" disk or 720K or 1440K 3.5" disk,
> > you can just type 'dd if=/dev/fd0 of=disk.img' and get a copy of it...
>
> The problem is that for DEC RX50s, they are _not_ 360K or 1200K 5.25"
> disks... they are single-sided, 10-sectors of 512 bytes per track, 80
> tracks. They can be read in an ordinary PC high-density drive, but
> they aren't the usual Windoze format. If they were, I'd just use 'dd'
> as you suggest.
>
> So... again... who here knows how to make 400KB images from real RX50s
> that emulators will like? I have a wad of Ultrix 32m and MicroVMS
> diskettes I'd like to spool off, in addition to a small quantity of
> RT-11.
>
> If I have to go with DEC hardware, I can; it will just take a lot longer
> to do.
>
> -ethan
>
>
>
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Received on Fri Jun 21 2002 - 16:33:11 BST