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 consistent. Even after switching from 7360 to 8360 MOS needed two more revisions to get the HMOS-II TED working as intended. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-10-27 19:00:16
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