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Re: rtVAX300 .. need help..
>> I am very impressed. I do not think my German would be as good in
>> the analogous case.
> Thanks for the flowers :-)
Bitte. :-) (Ich spreche ein bißchen, aber sehr bißchen.)
>> I don't know how your rtVAX 300 does interrupt arbitration and
>> mapping. That information might be [...]
> Ther si something in the Hardware manual about this in a rtVAX300,
> that wasn't te problem, I wanted some hints about other VAXen to just
> understand the related NetBSD files.
Ah! I can, maybe, help with the KA630 - though that might not be all
that noteworthy, as I'd hazard a guess that it may be one of the
better-known implementations here.
> It is interesting how DEC migrated from a "all known, all standard"
> system on UNIBUS and QBUS where any register address and bit was
> known to a wide varying family of machines where things are new all
> the time.
All documented, I feel sure...but the documentation was
internal-use-only. :( I still recall when a colleague of mine found a
hardware bug in the KA630, one that likely wouldn't've been nearly as
much of a mystery if we'd had schematics. (AIUI anyone with a KA630
could still get the bugfix applied free for as long as DEC Field
Service existed - you just had to know which ECO to ask for. Not that
it is likely to cause anyone much trouble, or it would have been found
> Exactly this is what makes me trouble since I don't know if a feature
> is "standard" or an one-off occurrence.
Well, when the "standard" (the VARM) is getting rewritten for each new
implementation, I'm not sure the difference is as meaningful as one
might wish. :( (Okay, that may be unfair; I don't know to what extent
VARMs came out at least as often as new implementations.)
>> I fear this is not very helpful.
> You are just wrong here.
Of all the things I wrote in that email, that's probably the one I'm
happiest to be wrong about!
>> [...], I don't have much to offer. Not because I don't want to
>> help, but because I have no help to give.
> That's not true. Just keep talking with me, this helps a lot.
Well, that much I can do. :-)
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