Re: New Vax - future directions :-)

[Hans Rosenfeld <hans%netbsd.org@localhost>]

On Wed, Jul 07, 2021 at 04:46:36PM +0200, Johnny Billquist wrote:
> I think you are underestimating the limitations of the PDP-11 compatibility
> mode of the VAX...

I certainly am. :)

> No split I/D space, no FP, any kind of trap exits out to VAX mode, anything
> that depends how the memory management of the PDP-11 works will have
> issues... Even some instructions you might play with are missing (but I
> don't think most people would miss them, especially not since we don't have
> split I/D space anyway).
> 
> Very few 2.11BSD programs would work in this environment... The most serious
> limitation is the lack of split I/D space.

So I guess we have another few feature requests, then... :)


Hans


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