Subject: RE: KA675/KA680 differences
To: 'Michael Kukat' <email@example.com>
From: Carlini, Antonio <firstname.lastname@example.org>
Date: 01/13/2001 00:07:36
> So the speed might be not that different? According to the HW
> www.netbsd.org, KA675 (4000/400) is Mariah based and rated 16
VUPs, while the
> KA680 is rated 32 VUPs. But ok, i'll see. It just came up in
> user mode. I'll compile a kernel now, put my KFQSA in it, and have
> a cool new machine... at least i hope so :)
I'm not near my notes (well, I am but the machine is switched off
and it's late ! ) but from memory the KA680 was the first NVAX VAX
The KA675 was presumably built to fill a gap in the performance
range - this was done by disabling the VIC. I suppose theoretically
this would have allowed otherwise useless NVAX chips (i.e.
those where everything worked except the VIC) to be used.
I doubt that this would have been worthwhile. (This was done
in other cases though - the original DECnis MPC used culled
SOC chips: i.e. those where the FPU had failed and at least
five of the six (or 8??) cache banks worked).
> I only have KA660 and KA680 here. KA660 helped me a lot for this
> KA680 still waits for support... I think, i'm _extremely_ near.
> will get something for the TM the next days, if everything works
like i want
> it to...
> Ok, the 4k60 and 3100m80 is correct in this case. And things math
> case as i got the same strange errors, and the same interrupt
> memory (0x54 and 0x60).
> 680 is still missing. I encountered strange problems about... half
a year ago,
> but now i see new light, if the 680 is that near to the 675. I was
> the experimental hardware for this, and the KA53 i have here is
> different from the KA680 due to the dz at ibus instead of
I've got tech manuals for most of the above kicking around somewhere
so if you need descriptions of the interrupt structure just ask (I'm
such details are in the manuals I have ... ). It may take me a few
get to the docs though.
If you have the EK-KA680-TM then you should be able to get any and
of KA675, KA680, KA69x working since they are all the same with
just a few *minor* differences (CPU cycle times, cache size, VIC
The basic design is (AFAIK) identical.