Subject: RE: KA675/KA680 differences
To: 'Michael Kukat' <email@example.com>
From: Carlini, Antonio <firstname.lastname@example.org>
Date: 01/12/2001 23:38:35
>Could it be, that the only difference between the VAX 4000/400 and
>is the CPU chip? (KA675 uses Mariah, KA680 uses NVAX). Would be not
That's bad enough: AFAIK both the KA675 and the KA680 are NVAX
(And so are the KA692 & KA694).
Depending on heatsinks etc. - no, don't knock them off just to check
both boards should have a DC246 (the NVAX chip).
The KA675 runs the NVAX at 16ns, the KA680 at 14ns.
Both have a backup cache of 128KB. The KA675 disables the
NVAX on-chip VIC (but I'm fairly sure the other on-chip cache
is left enabled).
> so i have a physical machine here to do the 675 port and the 680
> nearly "automagically". (Yes, the donator of the TM is waiting for
a kernel :)
Which tech manual are you looking at? I've just looked at the
maintenance guide and it agrees with my recollection. I don't think
any VAX 4000
used a Mariah: The 100-, 400, 500- & > 500 all used NVAX. The
Rigel (IIRC), the 4000-200 was CVAX.
One of the uVAX 3100 series used a mariah ( uV 3100-80 ??) and the
also used a Mariah. The only other one that springs to mind is the
6000-500 (for which
the chipset was designed).
>Does anybody know about these 2 boards? (And does anybody have a
hot hint for
>some strange problems looking to me like a bit more complicated
>handling than on VAXstations and earlier VAXen, especially KA670).
I still have access to various VAX 4000-5/6/700 systems and there
to be a VAX 4000-400 CPU card kicking around (although I don't
I'll manage to find that!)
I don't think there is much you need to do differently to support
the KA675 if you already support the KA680 (except leave the VIC
off obviously - I believe the console turns it off somewhat
abruptly, possibly patching the NVAX ucode on the fly to
I have no idea about interrupt problems.
>Ok, i have lots of boards to scan for the visual field guide the
>think the DIV32 pictures could be interesting, this card doesn't
seem to be
Dunno - I had (possibly still have) two of those but I only ever
saw one DEQRA and one LNV21. I never actually saw anyone use
any of these though!