Re: 6502-as-6509 project: update and question...

From: Micah Bly <micahbly_at_gmail.com>
Date: Mon, 16 Apr 2018 20:40:59 -0500
Message-Id: <8DDB56F7-55CE-485B-BAB8-AEA039CE154F@gmail.com>
Very cool!

It looks like there are whole series of chess computers using different variants of 6502s. e.g.:
http://www.spacious-mind.com/html/constellation_3_6.html
"Novag Constellation 3.6Mhz.
This is a beautiful sensory board that is very sensitive. It can compute 24 moves ahead and solve mate-in-12 problems. The program is a 16Kb one and it also incorporates the CMOS chip technology for energy saving. It has a blitz and tournament level. It runs on 6 1.5V C batteries or you can use an A/C adapter. It can play 40 moves in 2 hours. It has take-back and hint features."

Not sure about the accuracy of that bit in italics, but fascinating. Would be fun to dump that ROM and get it running on a CBMII!

Micah


> On Apr 16, 2018, at 3:09 PM, smf <smf@null.net> 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 04:00:03

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