VAX 4000-100 QBUS cables

Pontus Pihlgren pontus at Update.UU.SE
Mon Nov 28 09:31:00 CST 2016

On Mon, Nov 28, 2016 at 03:14:57PM +0000, Maciej W. Rozycki wrote:
>  FYI, the VAX 4000-100/105/106 (KA52/KA54/KA54) systems have no backplane 
> of any kind and do not use Q-bus internally, except for the CQBIC (CVAX to 
> Q22-Bus Interface Chip) ASIC directly bridging one of the NCA (NDAL to 
> CDAL Adapter, or the north bridge in modern speak) ASIC's CP peripheral 
> buses to a mainboard Q-bus connector further wired with an internal cable 
> assembly to the pair of external connectors mounted on the backside of the 
> enclosure.

Thanks for clearing it up. Uhm, stupid question perhaps. But what is the 
CDAL, and what is it's role?

>  For the record they are DEC P/N BC04V-09 (17-02048-01), though the photos 
> with the only listing I could find indicate quite a sorry state of the 
> cables offered I'm afraid.

That looks very familiar... I need to go look in the box with assorted 
DEC cables.


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