14 Sep
2025
14 Sep
'25
5:20 p.m.
On Sep 14, 2025, at 17:46, Milo Velimirović via cctalk
<cctalk(a)classiccmp.org> wrote:
The only cpu that the unibone and qbone emulate is a pdp-11/20 processor, (in addition to
several peripherals) last I knew. Nothing with memory management, for example. QBus
PDP-11 machines can be had (eBay has a couple, one looks like it probably has, one looks
like it probably has a power supply that needs work) and would be easier for most to deal
with as compared to most of the UNIBUS machines. Maybe you could sell John that old PDP
11 that I recall you obtaining from me decades ago. ;) of course it doesn’t have any
memory management either.
JRJ
On Sep 13, 2025, at 12:59 PM, ben via cctalk
<cctalk(a)classiccmp.org> wrote:
On 2025-09-13 10:35 a.m., Milo Velimirović via cctalk wrote:
But can you still get a real PDP-11 replacement for driving vintage hardware?
Real pdp11s are somewhat scarce, but . . .
If you’ve got pdp11 UNIBUS or Q-Bus devices/controllers AND a backplane to plug them
into, but no pdp11 CPU, then a Unibone or Qbone is the thing you want. It will be as much
(or as little) of a CPU as you want.
On Sep
13, 2025, at 10:49 AM, Bill Gunshannon via cctalk <cctalk(a)classiccmp.org> wrote:
> On 9/11/2025 4:30 PM, Jim Davis via cctalk wrote:
>> You can get an emulated 11/23 running 4.2 BSD for $3.00. That's crazy.
>
> Can you tell me where? With that glaring error I am really
> interested in learning more. Google finds nothing with those
> terms.
>
> bill
It has to be hyperbole.
No pdp11 ran 4.x, the best you can do is 2.11— which is still being patched and
maintained; see the pidp-11 mailing list. Probably not $3.00, but $30.00 will get you a
sytem on a DIP package that will emulate most anything. Spend a bit more for a Pi4 or Pi5
if you want to drive a PiDP-11.