Re: C64 buses when RESET is asserted

From: Gerrit Heitsch <>
Date: Mon, 08 Apr 2013 16:31:02 +0200
Message-ID: <>
On 04/08/2013 04:17 PM, Michał Pleban wrote:
> But I don't know, what happens to the CPU and VIC buses when RESET is
> asserted? Are they driven or tri-stated?

Even with RESET asserted, the VIC still displays a picture on the 
screen. It can only do that if it is activly reading from RAM (and ROM) 
to fetch the data to be displayed.

If you want to be sure, you can tristate the CPU from the expansion port 
using the _DMA signal.


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Received on 2013-04-08 16:01:42

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