Re: Weird pulses on KERNAL chip select line

From: Michał Pleban <>
Date: Mon, 27 May 2013 10:41:30 +0200
Message-ID: <>

John McKenna wrote:

> While AEC is high, the high address lines are pulled up by RP4.  When
> AEC goes low, it takes the processor a little time to start driving the
> address bus.  In this time, the address is $Fxxx and AEC is low, and
> that means a KERNAL access.

Thank you for the explanation. So it means basically that it depends on
how quickly the processor takes over the bus? Are there any differences
between 6510 and 8500 in this regards? So far I was checking things only
on a 6510-based motherboard.


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Received on 2013-05-27 09:01:59

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