Re: Weird /KERNAL line on old boards

From: Mia Magnusson <mia_at_plea.se>
Date: Sun, 8 Jul 2018 17:50:21 +0200
Message-ID: <20180708175021.00005a9c@plea.se>
Den Sun, 8 Jul 2018 00:48:29 -0500 skrev Jim Brain <brain@jbrain.com>:
> It's probably because the PLA combinatorial logic is not registered.
> If one path is faster (or the inputs are faster), the output can
> cycle through some invalid states as the inputs settle.

Agree.
 
> The larger PLA might register the outputs, not sure.
> 
> I am just trying to think of a way you could overcome this.  I am 
> wondering if you can use a specific address of KERNAL ROM as the 
> trigger, like $ffff

Or require a longer _KERNAL pulse than this false pulse?


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Received on 2018-07-08 18:02:17

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