[stella] Re: PCAE and Pitfall 2

Subject: [stella] Re: PCAE and Pitfall 2
From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx>
Date: Tue, 5 Mar 2002 11:30:58 -0800 (PST)
On Thu, 28 Feb 2002, Adam Wozniak wrote:
> Has anyone looked closely enough at the PCAE source code to figure out
> how it handles Pitfall 2 ?

Hrm, no responses so far...

Looking into PCAE source code, I see 'hot spots' for their Pitfall 2
bank switching scheme at x1FF8 and x1FF9, as well as x1040-x107F,
x1840-x187F, x1000-x103F, and x1800-x183F.

The rom image is 8k + 2k + 256

I assume x1FF8 and x1FF9 switch between the two 4k banks just like any
other 8k cart.

Documentation indicates the 256 bytes are sequentilly produced by each of
3 random number generators.

How does the 2k fit with the areas x1000-x107F and x1800-x187F ?  Where
are the random number generators used?  I get lost as I follow the PCAE
source down into x86 assembly land...

Any clues?

adam@xxxxxxxxxxxxxxxx        http://cuddlepuddle.org/~adam/pgp.txt

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