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

From: smf <smf_at_null.net>
Date: Mon, 16 Apr 2018 21:09:24 +0100
Message-ID: <11e882db-4736-9cf4-3da0-f9c80c8232d0@null.net>
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 2018-04-16 23:00:02

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