[Info-vax] DZQ11 on VAX/4000 Model 300

[Michael Moroney]

"John E. Malmberg" <wb8tyw at qsl.net_work> writes:

>All devices greater than BIRQ4 should be closer to the CPU than any 
>serial card, regardless of what the documentation states or you will 
>eventually get either a bugcheck or machine check.

I never encountered any devices that used other than BIRQ4.

>All Q-bus serial cards that I have seen have a bug in that they only 
>pass the birq4 related signal from cards after them in the bus.


>Many 3rd party Q-bus disk controllers are BIRQ5.

Was there anything else that did so? Anything from Digital that did so?