My first computer, an OSI C4P (1MHz standard) could easily be overclocked to 2MHz with a jumper (which I did to mine), and there was also a "GT" option available from factory for 4MHz... all in 1981. Steve From: didier derny <didier@aida.org> To: cbm-hackers@musoftware.de Sent: Monday, April 16, 2018 4:49 PM Subject: Re: 6502-as-6509 project: update and question... A guy a scientific in France was playing with 6502 the was sorting them by speed a good number reached 7Mhz On 16/04/2018 22:09, smf wrote: On 16/04/2018 16:54, Gerrit Heitsch wrote: The 6502 comes in different flavours: 6502 1MHz 6502A 2MHz 6502B 3MHz I wonder what they called the 8MHz chips? In there we found a hint at this story from Brian Bagnall's On The Edge: """ Although Commodore ran their computers at 1 MHz, Charles Winterble claims they were able to achieve faster speeds with the 6502." We thinned the oxides down and we intentionally did some very high speed versions of that," says Winterble. "One thing MOS [Technology] had going for it was a really good quality oxide. By thinning these gates down, we were able to drive it faster and faster. Then we did selection, in terms of our testing, to pull out the fast ones. We actually made a couple of really hot processors for a chess tournament for somebody. He literally water-cooled it, and he ran it at something like 8 MHz. It was just ridiculous how fast he ran it."Received on 2018-04-17 00:00:03
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