2 Feb
2017
2 Feb
'17
11:55 a.m.
On Feb 2, 2017, at 11:38 AM, william degnan
<billdegnan at gmail.com> wrote:
My first exposure to Unix was in 1977. We were running v6 on a *new*
PDP-11/34 with 4 RK05 drives. At time time DZ11?s were in short supply so
we (my room mate and I) built a z80 terminal concentrator so that we could
run 16 terminals off of the 11/34. I wrote the code on the z80 and he wrote
the Unix driver. We ended up re-working the protocol several times because
we kept loosing control packets. It wasn?t until later that we discovered that
the DL11 were were using to communicate with the z80 would not stay in
8-bit mode?we replaced the DL11 and everything was solid.
TTFN - Guy
On 2/2/17 11:32 AM, william degnan wrote:
On Thu, Feb 2, 2017 at 2:36 PM, Al Kossow <aek at bitsavers.org> wrote:
All this talk about compatibility...was there
ever UNIX made for the PDP
11/40 and RL02, or was it only run on RK05? Wouldn't all of the C and
wake
calls, etc issues have been solved then? Why is
this an issue now? I am
largely ignorant to the details but from 20000 feet it would seem like
this
would have been taken care of long ago. No need
for pre-processing code,
etc. Please educate me if I am wrong, just curious.
Bill Degnan
DEC V7m comes to mind.
Yes, but in 1974 that was not an option. I guess the 74-77 version of UNIX
that would have been installed on a PDP 11/40 would have been made for RK05
drives. It would prob be worth the effort to find a version of UNIX 6 for
that media and port to RL02, rather than take a vanilla UNIX 6 and try to
make it work on RL02's and re-solve all of the problems that have already
been solved for the RK05 version. AND the RL02 is larger so moving a
multi-disk UNIX for RK05 disks/partition would not be confined by space.