On Mon, 12 Jun 1995, Chris G Demetriou wrote:

[snip snip (TAS stuff)]

> Given that, the only places where the OS _could_ be involved are:
> 	(1) in the possible handling of faults related to read/write
> 		operation, and
> 	(2) in dealing with caching issues.
> 
> It's not clear to me how the OS could get either of those 'wrong' in
> such a way that TAS wouldn't be usable...
>From the Amiga ROM kernel reference manual:
"Never use the TAS instruction on the Amiga.  System DMA can conflict 
with this instruction's special indivisible read-modify-write cycle."

I don't see how this would be an issue for memory that isn't accessible 
by the custom gfx/audio hardware, but then again... I dunno.


Henric Jungheim  --  uhenric@mcl.ucsb.edu  --  henric@engineering.ucsb.edu