Re: rtVAX300 .. adding an CPU Type..

[Holm Tiffe <holm%freibergnet.de@localhost>]

Dave McGuire wrote:

> On 01/03/2013 06:06 PM, Matt Thomas wrote:
> >> As some of you already know I'm fiddeling around with an ISA Board 
> >> in a PC that has an rtVAX 300 CPU on it.
> > 
> > The primary difference between the rtVAX and normal VAX is that the
> > rtVAX requires the process page table pointers (and, hence, page
> > table) to use physical address rather than system addresses.
> > 
> > This means all the process page tables have to be physically
> > contiguous (as opposed to virtually contiguous).  Given the rapid
> > fragmentation of physical memory, this makes new process creation
> > difficult since there will rarely be enough physically contiguous
> > memory available for the new process' page tables.
> 
>   Not the rtVAX-300.  The -300 is a little module with a bog-standard
> CVAX chip, an SGEC, and some flash chips for a bootstrap on it.
> 
>   Here's one, socketed, on a 6U VME board:
> 
>   http://www.neurotica.com/misc/rtVAX-300-1.jpg
>   http://www.neurotica.com/misc/rtVAX-300-2.jpg
> 
>                  -Dave
> 
> -- 
> Dave McGuire, AK4HZ
> New Kensington, PA

He Matt we already clarified this :-)

http://www.tiffe.de/robotron/VAX/rtVAX300-internal-1.jpg
http://www.tiffe.de/robotron/VAX/rtVAX300-internal-2.jpg
http://www.tiffe.de/robotron/VAX/rtVAX300-internal-3.jpg

...the rtVAX has nothing todo with robotron at al..

Regards,

Holm
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