Date: Sat, 28 Feb 1998 16:18:57 GMT
Message-Id: <199802281618.QAA20434@holyrood.ed.ac.uk>
From: J Lothian <jlothian@holyrood.ed.ac.uk>
Subject: RL02 meets BSD
To: pups@minnie.cs.adfa.oz.au
Sender: owner-pups@minnie.cs.adfa.oz.au
Precedence: bulk

I've had an RL02 working on an 11/750 running
BSD4.3. The RL11 controller only has 16 words of
buffer memory, so you've got to make sure that other
devices don't hog the bus too much. In particular,
UDAs should have their DMA burst set to something like 1.
Setting it much higher causes the RL11 to get data lates
as its silo overflows before it gets access to the bus
to do DMA. However, the RLV12 seems to have a much bigger
silo (256 bytes?), so this should't be a problem for it. 

The only other things I can think of are bus grant problems
&c. If you're using an RQDX3 in the same machine, bear in mind
that it doesn't pass the grants, and so should be the last 
device on the bus. 

James