[Simh] Unix SYS III on SIMH

[Jason Stevens]

Hmm so I changed the x00's to xff's and it just hangs at the boot..


% ./vax780  tboot.init

VAX780 simulator V3.8-1

HALT instruction, PC: 00030033 (HALT)
UNIX tape boot loader



I let it run for a while..  Its weird as the rest of the BSD stuff
installed and operated what seemed in a 'normal' fashion with the
x00's...

On Thu, May 21, 2009 at 1:23 PM, Andru Luvisi <luvisi at gmail.com> wrote:
> On Thu, May 21, 2009 at 5:02 AM, Brad Parker <brad at heeltoe.com> wrote:
>> Jason Stevens wrote:
> [snip]
>>>sub end_file {
>>> print "\x00\x00\x00\x00";
>>>}
>>
>> I thought there was a different marker for EOM; you might try that.  The
>> program looks correct, as to do the positions of the tape marks.
>>
> [snip]
>
> By Golly, you're right!  I just checked the simh docs and EOM is
> "\xff\xff\xff\xff".  I wrote that script while I was trying to get
> 2.11BSD going on simh with networking.  I don't know if the file
> format changed since then, or if I just misread the docs or what, but
> it worked for getting 2.11BSD installed.  It's possible that I just
> never had any problems because I never tried to read past the last
> file.
>
> It's not clear in the simh docs whether there's supposed to be an EOF
> before the EOM or not, but you could try it both ways and see if
> either works.
>
> Andru
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