9 Jun
2025
9 Jun
'25
8:54 p.m.
There's a nice UDA/KDA emulation that uses SD cards or basically anything
on the Linux side. I helped Dave Plummer (Dave's Garage fame) get it
working with 2.11BSD on an 11/85 as a second KDA which 2.11 did not want to
do. I suspect that's the way to go these days. He has it emulating
RA92's and a few other things. Since this is more about HW than UNIX
specifically, we should take it off line.
Clem
On Mon, Jun 9, 2025 at 4:40 PM Noel Chiappa <jnc(a)mercury.lcs.mit.edu> wrote:
From: Vicente
Collares
I'm more interested in its historical
signaficance.
If that's your interest, PDP-11's are absolutely _the_ way to go. The
PDP-11
is _the_ machine that made UNIX. That choice has good points, and a very
bad
point, though.
Good points are that QBUS PDP-11's are pretty easy to find, pretty small
(desktop PC-sized), and not very expensive. They're pretty robust, too - I
have a large stack of PDP-11 QBUS CPUs, and none of them had failed, as of
the
last time that I powered them on.
The very bad point is that working mass storage for them is very hard to
find. The controllers are around, but not the drives.
Does anyone know if anyone is making a QBUS mass storage clone? Bridgham
and
I were going to produce QBUS RK11/RP11 clone that used SD cards to hold the
bits. We got the prototype working, and it booted UNIX, but then I came
down
with COVID and post-COVID myalgic encephalomyelitis, and that was the end
of
that.
Noel