> Chuck McManis wrote:
> 
	>The KA675 (aka VAX 4000/400) is NVAX ? I was under the impression
from what 
	>information I can glean that the KA675 was a "souped up" Rigel and
that the 
	>KA680 (aka 4000/500) was NVAX based. Oh well, if/when I get one for
the 
	>collection it will be obvious :-) The KA680 is clearly NVAX but
there was 
	>some confusion in some DEC documentation about whether or not the
4000/400 
	>needed MS670 modules for memory or not, given that NVAX used a
different 
	>memory timing it adds confusion.

	The VAX 4000-10x[A] systems were all a whole different
	family, were all NVAX and all came in MicroVAX style
	cases (except the very last members of the series
	which came in PC-style vertical-standing cases).

	The VAX 4000-300 was the first of the
	4000 series to debut (at least going by VMS support,
	I don't have actual release dates for many of these).
	It was Rigel based (I mistakenly said Mariah earlier ...
	what can I say?, it's been a long time :-) ).
	It shipped in the BA440 box, it had DSSI etc.

	My recollection is that the VAX 4000-200 actually 
	shipped earlier but I suspect my recollection is wrong and
	that it actually came after the VAX 4000-300. It was SOC-based
	(one of only a few machines which were). It shipped in the
	BA430 (IIRC) but could also come in a BA200 series
	chassis. It was intended as an upgrade for the KA650/KA655
	machines but although rated at 5VUPs it could (sometimes)
	be outperformed by the 3.8VUPs KA655 systems.
	(The KA660 had 6KB of on-chip cache; the KA655 had
	1KB of on-chip cache but 64KB of backup cache ....)

	The next to be released was the KA680 VAX 4000-500.
	This was NVAX-based, as were all the subsequent
	VAX 4000 machines. This was announced on 30-OCT-1991.
	This, and all subsequent VAX 4000 series systems, shipped
	in a BA440 with the 64-bit backplane.

	The KA675 VAX 4000-400 and KA690 VAX 4000-600 were
	announced on 7-JUL-1992. The KA690 was an upgrade,
	producing 32 VUPs compared to the KA680's 24. The
	KA675 was basically slugged to 16 VUPs to fill a hole
	in the range (I guess).  The KA680 had been codenamed
	Omega; the KA690 was known as Omega-F and the KA675
	was known as Omega-S (your guess is obviously as good
	as mine!) 

	The KA691 VAX 4000-505A and KA694 VAX 4000-705A
	were both announced on 15-AUG-1994.

	I've lost track of where the KA681 VAX 4000-500A and
	KA692 VAX 4000-700A popped up - obviously somewhere
	between the 500/700 and the 505A/705A. Probably announced
	at the same time too.

	At some stage there was a VAX 4000-600A but things
	became a little confused here. I *think* the VAX 4000-600A
	was released but swiftly renamed the VAX 4000-500A.
	The only thing I'm sure of is that *one* of the VAX 4000-600/600A
	ceased to exist and was renamed - but with no real
	announcement either internally or externally
	(at least, none that I saw).

	>Was there a VAX 4000/300A ?

	Nope


	Antonio