Introduction and need help bringing some pdp11's back

[Chris Zach]

Oh the 9058 is the "Q Bus" card with the 50 pin breakout to 34 pin and 
20 pin lines for the various drives. That's not the RQDX3, and I don't 
need that since I have the BA23 with a bulkhead connector.

And yes, I do remember nothing could be after a RQDX1 or 2 so they had 
to be in the last unused slot on the box with a grant card needed if the 
slot above and to the right was open. They do use DMA/NPG.

Off to look up the jumper settings and see if this RQDX3 is configured 
properly....

CZ

On 10/29/2019 9:34 PM, Nigel Johnson via cctalk wrote:
> 
> On 29/10/2019 20:37, Chris Zach via cctalk wrote:
>> The M9058 can plug in to any general slot in Qbus for power and does not
>>> past interrupt or DMA grant.  Bottom/end of the bus is fine.
>>
>> Interesting, I didn't realize the RQDX series boards didn't use 
>> interrupts or DMA. Does the CPU just poll them endlessly?
>>
> RQDX1 and 2 did not pass them but used them. (Maybe not NPG)  I believe 
> the RQDX3 did, however.
> 
> Nigel
> 
> 
> 
> Nigel Johnson
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