Unknown MicroVAX 2000 Board

allison ajp166 at verizon.net
Sun Sep 19 07:12:53 CDT 2010


On 09/19/2010 07:08 AM, Eric Smith wrote:
>  Rob Jarratt wrote:
> > I recently acquired a couple of MicroVAX 2000s. One of them has this 
> board
> > in it [...] I don't know what this board is but it connects by two 
> ribbon cables to
> > connectors on the main board. Can anyone tell me what it is?
>
> Since it has the AMD Am7990 (DEC 21-21672-07) "LANCE" Ethernet MAC and 
> what appears to be an AMD Am7992 Ethernet transceiver (obscured by 
> rework), it seems likely that it is the optional DESVA Ethernet 
> interface module (installed as standard on VAXstation 2000).  Note 
> that the presence of an Ethernet connector on the KA410 main logic 
> board doesn't mean that the machine has Ethernet; they just put the 
> connector there but the necessary electronics is all on the separate 
> module.
>
> Eric
>
>

It is the Ethernet board and yes the electronics were off the main 
board.  It was not an option
as MicroVAX2000s were all built with it.  It was for repair purposes. 
The only variation common
was memory. mostly because memory at the start of production was expensive.

Allison




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