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Re: New Vax - future directions :-)

On 2021-07-07 13:37, Anders Magnusson wrote:
Den 2021-07-07 kl. 11:37, skrev Hans Rosenfeld:
On Sat, Jul 03, 2021 at 03:46:00PM +0200, Anders Magnusson wrote:
Even though there are 288 instructions, a few are missing that would be
nice.  For example;
- Unsigned mul/div.  Vax only have signed.
- logical shift right.  Vax have EXTZV, but it is an unneccessarily
complicated instruction.
- AND.  Vax have BIC instead, but that (almost) always require a complement
as well.
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...)

I'l keep it in mind.  Does not have high priority though :-)

Obviously not the most urgent thing right now. I suspect an MMU is high on the list, though.


Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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