Re: New ][ Hardware - DSP board (soon!)

[kpopple@imp.sim.es.com (Ken Poppleton)]

In article <1993Feb25.210713.18808@mcs.anl.gov>, b45075@opal.ctd.anl.gov (Nathaniel Trost) writes:
> Hmm, unless I'm mistaken it doesn't look like the board supports DMA transfers
> to/from the GS memory.  Does the board support DMA?

You are correct, I did not get a DMA controller on the board,  I would
like to have one, but have not had the time to put that in.  This
has mostly been a lack of understanging the requirements for a DMA
controller which would operate on all the AppleII machines.  If you
have a good reference to how DMA is done for a GS I would like to know 
about it.  How much hardware does this take?  I am finding that the
board is getting very full, and am unsure about the routing for the
simple board I am now testing.  Can you recomend a low cost <$10 DMA
controller chip?  Or how many pals and chips it would take!  Remember
this must work for all AppleII's.

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Ken Poppleton
kpopple@imp.sim.es.com
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