19 Jun
2005
19 Jun
'05
9:06 p.m.
Subject: Re: Several comments on crashed drive in PDP-11/23
From: "Jerome H. Fine" <jhfinexgs2 at compsys.to>
Date: Sun, 19 Jun 2005 23:57:17 -0400
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at
classiccmp.org>
It's possible to do RX01, but RX02 format is beyond what
the 765 based PC clopped controller can do. RX02 is not
the common style of DD format. To do SD format you need
to do a fair amount of work and likely a older or even
XT PC to insure the FM mode at 8" data rates is available.
Easier shot is the RX50 (SSDD, 96tpi).
Vintage Computer Festival wrote:
I downloaded and ran the TU58 simulator on my PC,
then booted RT11 off
that. I then created a bootable RT11 system disk and used the floppy to
boot. Then I could mount blank images in the TU58 simulator and copy
files from the PDP11 to the PC. Then you can use the PUTR utility to
extract files from the images on the PC into standard PC files.
Jerome Fine replies:
If you have a 5 1/4" RX50 floppy drive on a real DEC PDP-11,
then it is probably much faster and easier to prepare
the floppy on the PC with PUTR in the first place. If
the floppy is 8" and SSSD (RX01), then I understand that
a PC can also have the same, but I don't know if PUTR
can also handle 8" SSSD floppy media on the PC. In any
case, I have no experience with 8" floppy media on a PC. I am certainly NOT saying that a TU-58 is a bad
solution,
only that other solutions are often better if they are
possible. If the only way to start is with a TU-58, then
it is certainly better than nothing.
Bob, of spare time gizmos did it right. 8051 with 2 256kB
rams to look like a TU58. Save for one difference. The
seek time is way faster!
Allison