[Simh] VAX 8200/8250

[Johnny Billquist]

On 2019-04-06 22:28, Timothy Stark wrote:
> I was surprised to see that!  Very good news!!  Good job!  I will try that soon.
> 
> For 8250/8350, you need two MP processors.  Does vax820 emulate two MP processors like VAX-11/782?

The 8250 multiprocessor uses VAXBI for interconnection, and it's a 
symmetric multiprocessor system.
The VAX-11/782 was a very different beast with shared memory, and 
asymmetric multiprocessing.

But as far as I know, simh supports neither, as it don't really manage 
multiple processors that easily in general. Too much global data, if I 
remember right.

   Johnny

> 
> Tim
> 
> -----Original Message-----
> From: Simh <simh-bounces at trailing-edge.com> On Behalf Of Matt Burke
> Sent: Saturday, April 6, 2019 1:21 PM
> To: Simh Trailing-Edge Mailing List <simh at trailing-edge.com>
> Subject: [Simh] VAX 8200/8250
> 
> Here is a new simulator for the VAX 8200/8250 systems. Most of the key features are there including the DWBUA BI-Unibus adapter which allows all the existing Unibus devices to be used. The console RX50 is also implemented.
> 
> The console processor is not simulated so it uses the same VMB trick as the VAX-11/7xx simulators i.e. you boot directly from a device "boot rq0" rather than "boot cpu".
> 
> You can get the code from:
> 
> https://github.com/9track/simh/tree/vax820
> 
> And Windows executable from:
> 
> http://www.9track.net/simh/vax820
> 
> Please try it out and let me know how you get on.
> 
> 
> Matt
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-- 
Johnny Billquist                  || "I'm on a bus
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