Re: Additional cartridge ROM question

Re: Additional cartridge ROM question

From: Marko Mäkelä <>
Date: Tue, 24 Mar 2009 09:00:47 +0200
Message-ID: <20090324070047.GA21025@x60s>
On Tue, Mar 24, 2009 at 12:55:46AM -0500, Jim Brain wrote:
> But, if EXROM and GAME are LOW, but HIRAM and LORAM are low as well, do  
> I get RAM at the two 8K locations, or does EXROM and GAME override any  
> LORAM/HIRAM settings?
> The PRG and the various web sites were not helpful in resolving my question.

The PLA equations at
do answer your question.  The shortest equation for CASRAM appears
in this file, which I haven't checked:

I think your question was also answered by the article "Hiding kilobytes"
that I wrote for C=Hacking #7:

In the table of the article, you are interested in the configurations
where EXROM=GAME=low: 0000, 0100, 1000, 1100.  From left to right, these
are convered by the table headings 1000, 00x0, 0100, and 1100.  According
to the table, if LORAM=1, HIRAM=0 and CHAREN=1, you will get 64k RAM
when EXROM=GAME=0.


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Received on 2009-03-24 08:20:28

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