Re: 6502/6510 ROM selection daughterboard

From: silverdr_at_wfmh.org.pl
Date: Sun, 3 Jun 2012 23:31:46 +0200
Message-Id: <CC5F4129-ABA8-4AA7-A742-4A3EA0D0F9A2@wfmh.org.pl>
On 2012-06-03, at 23:08, silverdr@wfmh.org.pl wrote:

> I am aware that just plugging in the daughterboard is not going to  
> be enough. That was the reason for my question about the way (I  
> thought) you did it. I take additional lines need to be fed to the  
> board in order to present CHAROM data to VIC whenever VIC expects it.

On a second thought.. _LORAM, _HIRAM an _CHAREN would be available  
directly off the daughterboard placed CPU. Aren't those the key inputs  
for PLA in the context of the three ROMS in question? I mean in such  
case we don't need to tap on writes but (part of) PLA functions could  
be reimplemented in the CPLD, allowing the ROMs to be activated as  
needed, couldn't it? The VIC part remains tricky though.

-- 
SD!

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Received on 2012-06-03 22:00:35

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