loading disk image on PDP-11
iamvirtual at gmail.com
Tue Jun 9 16:45:16 CDT 2009
Dennis Boone drb at msu.edu wrote:
> > "I was thinking of using vtserver to transfer the image over a serial
> > line, but the 'copy' program is not compatible with my PDP-11/05 (it
> > uses the 'mul' and 'div' instructions which is not available on my
> > PDP-11/10)."
> I haven't exhaustively searched for such instructions, but a sample
> multiplication found in the C source didn't turn into a mul
> instruction. You sure this is the cause?
Looking at the source for vtserver v2.3, the srt0.s file contains the
'mul' instructions. The copy program is aware of the I&D space. It
appears the primary purpose of vtserver is to allow the
installation/copy of early Unix versions onto RK05's. The source to
vtserver appears to be implemented using the early unix version, so it
is not really what I need since I cannot modify it to work on my
The initial vtboot portion of vtserver does work properly on my
PDP-11/10. I am able to have the 'copy' program transferred over to
the /10 but the processor halts soon after execution begins.
The source for vtboot does look like it should work on most machines.
I updated the code slightly to make it position independent.
I am thinking I will need to write something that will allow me to
transfer the disk image over a serial port. I just don't want to
re-invent the wheel ;-)
My needs are to take a disk image on a host machine and get it
transferred over to a PDP-11 via a serial port to be scribbled onto a
RK05 disk. Does anyone know of another tool that can do this? I am
aware of the TU58 emulator, but that only helps getting something into
memory on the PDP-11, but does not help in getting the data onto the
Thank you so much for the information to date! I really appreciate
the pointers and discussion.
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