21 Jun
2002
21 Jun
'02
4:33 p.m.
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(a)yahoo.com>
To: <cctalk(a)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(a)purdueriots.com> wrote:
On Fri, 21 Jun 2002, Antonio Carlini wrote:
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
__________________________________________________
Do You Yahoo!?
Yahoo! - Official partner of 2002 FIFA World Cup
http://fifaworldcup.yahoo.com
(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...