Re: Userland emulator

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2013-03-26 01:03, Rhialto wrote:
> On Tue 26 Mar 2013 at 00:45:23 +0100, Johnny Billquist wrote:
> > The VVAX (Virtual VAX) addes three instructions (WAIT, PROBEVMR and
> > PROBEVMW), adds one bit to the PSL (telling it's executing in
> > virtual mode), and changes the behaviour of a lot of stuff if you
> > are in virtual mode, as well as having a fake PSL for the virtual
> > machine.
>
> Ah, googling for those instructions gave me the paper
> http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.137.3443&rep=rep1&type=pdf
> (Virtualizing the VAX Architecture - CiteSeerX). Seems quite interesting
> (I just started reading it).

Well, you could just read the VARM as well...
http://bitsavers.trailing-edge.com/pdf/dec/vax/archSpec/EL-00032-00-decStd32_Jan90.pdf

Chapter 12 is about the VVAX.

        Johnny

--
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