Subject: Re: [stella] entropy & randomness From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Wed, 10 Oct 2001 18:04:36 -0400 (EDT) |
On Wed, 10 Oct 2001 urchlay@xxxxxxxxxxxxxxxx wrote: > Is there anything actually random in Pitfall? The game seems the same > every time... Pitfall II had what, some sorta hardware random number > generator? I've got the disassembly of River Raid that was posted here, > will look when I get home. Exactly!!! The whole point of those LFSRs is that they are only quasi-random. The Pitfall LFSR is sequential not only forwards, but backwards as well. This enabled David Crane to fit a *huge* map (255 rooms, IIRC) that is always the same, into just a few bytes. It's such a beautiful thing. -Chris - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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