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Re: New Vax - future directions :-)

> On Jul 7, 2021, at 9:34 AM, Johnny Billquist <bqt%update.uu.se@localhost> wrote:
> On 2021-07-07 15:03, Paul Koning wrote:
>>> On Jul 7, 2021, at 8:02 AM, Johnny Billquist <bqt%update.uu.se@localhost> wrote:
>>> On 2021-07-07 13:37, Anders Magnusson wrote:
>>>> Den 2021-07-07 kl. 11:37, skrev Hans Rosenfeld:
>>>>>> ...
>>>>> And, can we perhaps get a PDP11 compatibility mode, too? Like the one
>>>>> early VAX-11 models had? Please? :)
>>>>> Thanks for breathing some life back into the VAX, and into port-vax.
>>>>> This is so amazing on so many levels. :)
>>>> Hm, I haven't thought of that before, but it might be quite trivial to do that.
>>>> Almost no extra hardware, just a separate match for the microassembler.
>>> I'd be a little curious on why anyone would want it, though. (Even me, being a PDP-11 fanatic, isn't that interested in this compatibility mode...)
>> It allows running early VMS releases.
> Ah. True. But would you even try to do that on some new FPGA implementation of a VAX?
> Then you'd have to pretty faithfully implement all peripherals and other details of the VAX-11 machines. All the internal registers specific to that machine, and so on...
> If I wanted to run old VMS, seems like simh would be a simpler way.

It would, but doesn't SIMH need work to be able to install VMS V1?  I seem to remember that it requires a more complete emulation of the console than is currently available.


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