RE: DMA-line

From: David Wood (
Date: 2002-05-24 01:37:44

On Thu, 23 May 2002 wrote:

> Hallo David,
> > UHS undoubtedly will support dma.
> What is UHS ???

UHS, on accelerated machines, will use PIO, because DMA will likely be
slower anyway (for example, on the scpu you can only do DMA to the first
64k, from which you'll have to copy to the destination).  While optional,
the ability to use DMA is preferrable.

Summary - UHS can do without dma. ;) I'd rather have it not.  

I'd -like- to be able to use ultimax mode, or at least a kernal cart.  If
that's not available, make a reasonable form of mem management if you have
higher memory.  A setup a-la scpu is acceptable, as UHS aims to load high
and  lower the top of mem pointer.  Programs -assume- mem in bank 2, but
they dont assume mem in the higher banks ;)  Those that dont check and use
the top of mem can suck me.


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