Re: 16 MB REU clone

From: john/lori (
Date: 2001-08-27 08:39:31

> > So it would be possible to DMA, say, a peripheral's buffer to the
> > processor's address space, but I wasn't expecting it to be necessary.
> I'm not sure how to interpret the above sentence. But it triggered the next
> idea (and it could be what you meant):

> could the DMA of the REU be used to DMA data from a 1.44 MB floppy to your
> C64/128?
> The point is that the 1.44 MB cannot deliver the data at 1 MB/sec so a
> mechanism must be involved in the new REU that accepts external triggers.

An instance where DMA would be useful.

In the case of a floppy, what I was talking about, is having a buffer,
the floppy sends the data to the buffer at it's rate, then you'd
bank the buffer in to the processor's address space.
Of course, with a floppy (and other things) it would probably
make sense to DMA to move it to the proper place for, eg,
an executable.


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