Subject: Re: TK50Z
To: None <port-vax@NetBSD.ORG>
From: Michael Sokolov <sokolov@alpha.CES.CWRU.Edu>
List: port-vax
Date: 03/03/1998 13:41:11
   Dear Allison,
   
   You wrote:
> Init'ing them to zero is indicitive of nothing.
   
   See my response to Bertram.
   
> Depending on how many
> DMA address bits are actually used it only means the DMA will start at
> address 0 of buffer at offset(mapped?).
   
   This is correct, and this indicates that indeed the DMA goes to the
buffer and not to the main RAM.
   
> The real question was is there another address loaded somewhere else
> and also is the transfer length loaded some where else other than the
> 9224?
   
   The address in the main RAM is not loaded into any registers whatsoever,
and the data is moved between the main memory and the special buffer with
bcopy(), i.e., with CPU instructions.
   
   Sincerely,
   Michael Sokolov
   Phone: 440-449-0299
   ARPA Internet SMTP mail: sokolov@alpha.ces.cwru.edu