Re: 6702 chip

Hi Pavel,

what is the state of the 6702 chip schematics? Have you done them? I know the 
6702 problem seems solved as we have 
http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/6702.txt
now and a working VICE emulation, but it would be nice to have that confirmed.

Many thanks!
Andé

On Friday 22 February 2013 02:31:14 you wrote:
> Hello.
> 
> I've drawn layers of 6702 based on die shot published on visual6502. As the
> chip was not delayered yet the diffusion and buried contact layers are
> sometimes only guesses as they are not visible when hidden below the metal
> layer. Anyways I succeded in simulation of the chip and the results were
> exactly what expected for repetitive inputs 00-01, 00-03 and 00-81 (hexa). I
> did not test the other sequences because I suppose that they are OK. Maybe
> if someone here has some more elaborate (not repeating) sequence for me to
> test I'll test it.
> 
> If no one else wants to do that I can draw the schematic of the chip and do
> some analysis. The chip itself looks quite simply, it consists of 1249
> transistors.
> Below is the copy of my posting to visual6502 forum - if you try to run my
> simulator don't panic, it's quite slow, it runs for several minutes (some
> 85s on my i7):
> 
> ============================================================================
> =
> 
> Hello.
> 
> I was thinking if this chip is easy and repetitive enough that diffusion and
> buried layers could be renostructed just by thinking and intuition. I
> couldn't resist and I drew it and simulated it.
> 
> Total: http://www.pastraiser.com/pictures/6702/6702_total.png
> Metal: http://www.pastraiser.com/pictures/6702/6702_metal.png
> Vias: http://www.pastraiser.com/pictures/6702/6702_vias.png
...

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