pstevens@pioneer.arpa (Paul Stevens RCE Sterling) (03/24/88)
We have a VAX station II for use in performing real-time data acquistion.
We plan on using several DMA devices (2 DRQ3B's and 2 ADQ32's) both of
which use double buffering. The problem is that with the GPX device
(VAA) using 130 mapping registers and then 4 of these boards the available
496 registers get used up quickly. Does anyone know of any tricks to
let normal DEC supplied device drivers use the actual 8192 mapping
registers that a uVAX II has?
Also, are there any tricks for trying to make the permanent mapping
register allocation less fragmented? I'm not afraid to write some kernel
mode code, but since the researchers here want to use Labstar, special
device drivers are out of the question.
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Paul Stevens - NASA Ames Research Center Moffet Field CA
Mail Stop 233-10
(415)694-4887
pstevens@ames-pioneer.arpa
-----------------------------------------------------------------------
Paul Stevens - NASA Ames Research Center Moffet Field CA
Mail Stop 233-10
(415)694-4887
pstevens@ames-pioneer.arpa