Re: 264/TED/Plus4 Story

From: Gerrit Heitsch <>
Date: Thu, 27 Oct 2011 20:58:59 +0200
Message-ID: <>
On 10/27/2011 08:44 PM, Bil Herd wrote:
> No it took that many revisions to get that chip WORKING. :)

Hm.. OK... The prototype board mentioned here has a 7360R4A on it, makes 
me wonder how well that rev was working (and if it still does work).

> The kind of thing they fixed going from 6 to 7 dealt with things like the
> white noise generator.  It was a 256 byte ring counter or similar and the
> chip guys left the cells to power up in random states and would the shift
> them round and round, the problem was that due to process and geometry,
> they weren't quite random and so the white noise had a recirculating
> pattern to it, on a good day it sounded like a motorboat, a bad day was a
> motorboat in a hurricane.   So someone wrote a (Basic)program and
> generated a random number string and they hardcoded those as the starting
> bits for the white noise bucket-brigade generator.

It still sounds kind of odd with a pattern to it though. Not quite what 
I was expecting when reading 'white noise generator'. But at least it's 

Even after switching from 7360 to 8360 MOS needed two more revisions to 
get the HMOS-II TED working as intended.


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Received on 2011-10-27 19:00:16

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