> So the speed might be not that different? According to the HW
reference on
	> 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
networked single
	> user mode. I'll compile a kernel now, put my KFQSA in it, and have
fun with
	> 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
4000.
	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
port, and
	> KA680 still waits for support... I think, i'm _extremely_ near.
Maybe Stefan
	> 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
in this
	> case as i got the same strange errors, and the same interrupt
vectors for
	> 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
missing
	> the experimental hardware for this, and the KA53 i have here is
too much
	> different from the KA680 due to the dz at ibus instead of
PR-console.

	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
assuming
	such details are in the manuals I have ... ). It may take me a few
days to
	get to the docs though.

	If you have the EK-KA680-TM then you should be able to get any and
all
	of KA675, KA680, KA69x working since they are all the same with 
	just a few *minor* differences (CPU cycle times, cache size, VIC
on/off).

	The basic design is (AFAIK) identical.

	Antonio
	arcarlini@iee.org