[Simh] VAX firmware image

[Jan-Benedict Glaw]

On Wed, 2009-08-12 13:38:09 -0700, Benjamin Huntsman <BHuntsman at mail2.cu-portland.edu> wrote:
> I'm interested in the VAX simulator, but was curious as to where the
> ka655x.bin rom file came from.  Did someone snarf it from a real VAX
> at some point, or was it compiled specifically for SIMH?   Supposing
> someone wanted to take the effort to add another supported model,
> where would they obtain the requisite rom?

AFAIK, it's based on the ka655.bin image, which was indeed fetched off
a real VAX. A VAX' firmware image can be read starting at 0x20040000
(which happens to be the entry point).

The original KA655 firmware only checks for up up 64MB RAM (probably
because no more can be built in), and this was fixed in the binary
image. A simulated VAX can thus have 512MB RAM.

MfG, JBG

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      Jan-Benedict Glaw      jbglaw at lug-owl.de              +49-172-7608481
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