Re: 16 MB REU clone

From: Marko Mäkelä (
Date: 2001-08-24 13:25:55

On Fri, 24 Aug 2001, Martijn van Buul wrote:

> I think Bogax means transfers from expansion mem to expansion mem. (I'm
> not sure the original REU supported this. Actually, I think it didn't)

It doesn't.

> These transfers could be completely internal - no reason to claim the
> C64's bus, since it's not involved at all. In *that* case, an
> interrupt could very well be handy.

An interrupt might also be handy when using the comparison operation on
the normal REU.  A data compression application could enable the "verify
error" interrupt when searching for longest substrings.

> Furthermore, since you're not limited to the 1MHz bus of the C64,
> you could speedup those transfers.

Or you could provide a control interface to the REU clone to an external
device.  I wonder if the REC registers could be accessed from another
processor during a block transfer.


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