Re: [stella] Pitfall! LFSR

Subject: Re: [stella] Pitfall! LFSR
From: "Dennis Debro" <dnsdebro@xxxxxxxxxxx>
Date: Mon, 10 Sep 2001 11:27:21 -0400
Now you know this question was coming...could you post the flash file or was
it included with "Stella Gets a New Brain"?

----- Original Message -----
From: Glenn Saunders <cybpunks2@xxxxxxxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Monday, September 10, 2001 5:04 AM
Subject: Re: [stella] Pitfall! LFSR

> At 10:41 AM 9/10/2001 +0200, you wrote:
> >As I'm just finishing the Pitfall! disassembling, I would like to know,
> >David has a name for that special LFSR.
> LFSR is a modern term for it, but in the Atari days they called all this
> stuff, whether in software or hardware (like the 2600's horizontal motion
> and audio circuitry), polynomial counters.
> He called it an 8-bit polynomial counter and he said he experimented with
> various seeds in order to make sure the game it produced was interesting.
> I actually have a flash file I made that shows how a polynomial counter
> routine works...
> Larry Kaplan said that polynomial counters were an outgrowth of a magazine
> article that came out in the mid 70s on the subject, I think it was in
> magazine or something, and after that everyone started using them.
> -
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