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 ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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