>Doc wrote:
> >On Fri, 21 Jun 2002, Ethan Dicks 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.
> I _hate_ it when dd won't work! And it won't, at least in Linux --
> there's apparently no device which reads/writes 80/10/512 on 5.25"
> floppy. I can't find anything for NetBSD, either.
Jerome Fine replies:
That is why I use Ersatz-11 when I need to handle an RX50 (5 1/4" with
the 80/10/512 LLF format) floppy.
I find it is the best and fastest way to read/write data to that type of
media.
Plus, RT-11 has so many tools built in such as BINCON, SIPP, DUMP
and others to manipulate the data.
Of course, if you need to do an actual FORMAT of the media, then PUTR
can do that as well. The actual command in PUTR is:
FORMAT b:
when the 5 1/4" HD PC floppy drive is the second drive in a PC DOS/W95/W98
box. Since these days the 3 1/2" floppy drive is almost mandatory, it is
usually
the A: drive.
NOTE: If you are adding a 5 1/4" floppy drive to your system under Windows
98,
I found that the BIOS would accept the 5 1/4" floppy, BUT Windows 98 would
NOT do so UNTIL my son removed the 3 1/2" A: floppy drive from the list of
available floppy drives. Evidentially Windows 98 will not look at which
floppy
drives are available UNLESS there are initially NO floppy drives on the
system!!!
At least, that was my experience. If you have the same problem, let us know
so we will realize that the problem was not just an isolated difficulty.
> > 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.
> Ooohhh.... Ultrix! Will it run on KA630 or KA655? The PUPS version
> of 32M is like 11/780 or older or something.
> Erzatz-11 eval says you can read-write RX50 on a HD 5.25" drive. I
> expect that emulators, or at least E-11, will like those....
YES!!!! E11 is the best I have found.
Sincerely yours,
Jerome Fine
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Received on Fri Jun 21 2002 - 18:24:58 BST