22 May
2011
22 May
'11
8:37 p.m.
It's fine, though sorry for being a bit snippy, my <insert expletive
here> neighbour was being his wonderful self and got me all sour.
The way I convert non-TU58 images, to the RL02 sized image is:
1. Mount the media to be transferred onto the correct SIMH device.
2. Mount an RT-11 boot disk somewhere.
3. Mount a new RL02 image.
4. Boot RT-11.
5. Initialize the new RL02 (INITIALIZE/BADBLOCK).
6. Copy the files to the RL02.
7. Exit SIMH.
8. Mount the new RL02 to one of the emulated TU58 drives. (With either
an RT-11 that's been modified to work with RL02 sized images booting
from an RL02 sized image on emulated DD0:, or your real
RT-11 built
with the modified driver copying from the emulated - RL02 sized -
image to whatever disk you wish.)
To get a modified TU58 driver to RT-11 I use PUTR (find here:
http://www.dbit.com/pub/putr/ ) on my PC on the RT-11 install disk, to
replace a driver with the modified one. You can get a modified driver
ready to read RL02 sized TU58 images here:
http://www.fpns.net/willy/pdp11/tu58-emu.htm (Scroll down to a
hyperlink that reads "RT-11 DW.sys", it replaces the RT-11 DW.SYS
driver, which I believe was only used on the desktop PRO-whatever
systems.) The emulator I use is this one:
http://www.ak6dn.dyndns.org/PDP-11/TU58/tu58em/
I believe the fortuitous coincidence that SIMH RL02 images and TU58
images are readable in the emulator are because the TU58 is a block
addressable tape. In other words, it's a tape that acts like an
inordinately slow disk (just like TU55/TU56 DECtape... but not as
interesting to watch).
Cheers.
On 21 May 2011 18:57, Chris Elmquist <chrise at pobox.com> wrote:
On Saturday (05/21/2011 at 03:18PM -0400), Christian
Gauger-Cosgrove wrote:
Yes, it was a typo, thanks for pointing out the
obviousness (and my
forgetting to manually proofread that part of the message).
I just didn't want someone not as familiar with the OS to struggle with
a command that would definitely not work as intended.
Still, the point remains, it seems a bit easier
then VTSERVER to just
do it via a TU58 emulator, especially if VTSERVER ignores the bad
blocks on the real media.
Do you have a recipe for converting various non-TU58 images (such as
RL02) to a TU58 image so that it can be put onto the emulator and
then transfered to the target system?
Many of the images floating around are RL02, RX33, or other kinds of
rotating media/disk images and not tape images. ?What is the right
way to turn them into tape images for such an emulator?
Thanks.
Chris
--
Chris Elmquist