Re: DMA successes with Verilog

From: Mia Magnusson <mia_at_plea.se>
Date: Tue, 12 Jun 2018 17:12:09 +0200
Message-ID: <20180612171209.000045e1@plea.se>
Den Tue, 12 Jun 2018 00:35:33 -0500 skrev Jim Brain <brain@jbrain.com>:
> I know it's neither new nor terribly interesting to some, but the
> recent Ultimax mode success bolstered my confidence to try a few more
> complex things, like CBM 64 DMA.
> 
> I've been impressed by the flexibility of the development cart I 
> designed, as it required no more work to set up for DMA tests.
> 
> I started off my trying to DMA one byte (to address $8000), and when 
> that worked, I then tried 256 bytes.  I hit a snag when trying to
> store a user defined length and had to reimplement the code to use a
> state machine.
> 
> But, I have managed to get 1-256 bytes (user defined) to DMA from the 
> cart to the 64.
> 
> It's a small victory, but I always felt the DMA mode was a mystery in 
> implementation details.

Nice!

Seems like your expansion might be able to have a REU compatible mode
in the future :)

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Received on 2018-06-12 18:02:50

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