Re: Deluxe Pokey used as RNG??

From: Ed Henciak <ehenciak_at_yahoo.com>
Date: Tue Jul 13 2010 - 14:21:58 EDT

Looks like there is a register in POKEY that provides a random number. It's
probably the same value at the output of the noise generator. Just a guess
there.

Ed

________________________________
From: Tim Matthews <trmatthe@gmail.com>
To: vectorlist@vectorlist.org
Sent: Tue, July 13, 2010 2:19:27 PM
Subject: Re: VECTOR: Deluxe Pokey used as RNG??

>From reading the emulated POKEY specs, it does include a polynomial based
programmable random number generator (PRNG), so it could be that the asty
hardware uses this to provide seed coordinates for the asteroids. Would probably
have to check the schems to see if it's used for this purpose in this game
though.

tim

On 13 July 2010 19:13, <MKDUD@aol.com> wrote:

     I just had to change the Pokey in my Asteroids Deluxe. Board is now
working great.

> Before the old pokey failed, I was getting some really weird symptoms from
>the board. New waves of rocks would start, with all rocks EXACTLY overlapping
>each other. Aside from this, the failing pokey had the board putting out some
>really weird random noise (to be expected). However, I did not expect to see
>the rocks overlapping and have no separation during new waves, or when they
>were hit.
>
> I didn't know of any pokey's function to be used as a random number
>generator, am I wrong here? Or was the failing pokey also screwing up some
>stuff in the AVG or logic side? Anybody have any takes on this?
>
>Thanks,
>MK

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Received on Tue Jul 13 14:22:01 2010

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