Re: Switchless ROMs

From: smf <smf_at_null.net>
Date: Wed, 28 Dec 2016 18:18:13 +0000
Message-ID: <4686dbef-dabf-fdb1-c646-4290b917a7fe@null.net>
On 28/12/2016 17:53, David Wood wrote:
> Just use /cs as a clock for the simple state machine Jim talked about. :)
>

The problem with using /cs is that you then only pick up every time 
there is an access to the rom. You wouldn't be able to differentiate 
between a reset and this code running from ram:

LDA $FFFC
LDA $FFFD

What you need to do is figure out when a cpu access is happening when 
/cs isn't low. Which you can't realistically do without access to other 
signals. If you need access to other signals then you may as well just 
get the reset signal and be done with it.


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Received on 2016-12-28 19:00:34

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