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Date: Thu, 19-Jun-86 00:00:27 EDT
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Posted: Thu Jun 19 00:00:27 1986
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Newsgroups:  mod.computers.vax  net.periphs
Subject: DMA card for Q-bus
Date: Thursday, 19-Jun-86 00:00:25 EDT
Userid: D0430

We are looking for a self-chaining DMA card for the Q-bus (microvaxII).
The DRV11-W is the Q-bus version or the unibus DR11-W and neither are
self-chaining (resets dma transfer by itself before it interrups).
Grant Technology makes one, but it has no i/o port.  Ironically, DEC
make one for the Unibus (DRU11, I believe) and has a Q-Bus version
which it only sells in Europe (DRQ11, developed by Munich group).

Other alternative to self-chaining is DMA card which interrupts before it
is finished with DMA transfers.  Data Translations a-d cards do this.

Or, we could run the DRU11 with the Able Qniverter II.

Anyone have any recommendations on any of these?  Know of any cards that
might do the trick?  Any experience with Qniverter II.  (Under Ultrix
I assume that no software changes would be necessary since ubasetup()
emulates an 18-bit address space).

The card is needed for continuous d-a conversion.  Right now I
reset device registers in ubglue.s before call to driver interrupt routine,
but this is a kludge.