Additional cartridge ROM question

Additional cartridge ROM question

From: Jim Brain <brain_at_jbrain.com>
Date: Tue, 24 Mar 2009 00:55:46 -0500
Message-ID: <49C875E2.3080904@jbrain.com>
I have an option to make the cart a 16kB cart.  As I understand the 
various web sites, my PRG, and C=Hacking, I ground EXROM and GAME and 
then my 16kB will appear at 8000-9ffff (ROML) and a000-bfff (ROMH)

So far, so good.

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?

Why do I ask?

Well, if HIRAM/LORAM take precedence, I am more comfortable setting up a 
16kB image, knowing that if a user has an 8KB image they want to use, 
they can simply et HIRAM to 0 and get 8KB of RAM.  If I'm cutting them 
off from 8kB of RAM permanently by bringing both EXROM and GAME low, 
then I'm not sure I want to support 16kB images.

The PRG and the various web sites were not helpful in resolving my question.

Jim

-- 
Jim Brain, Brain Innovations                                      (X)
brain@jbrain.com 
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! 
Home: http://www.jbrain.com


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Received on 2009-03-24 07:14:33

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