Re: decapped CBM MOS

From: Marko Mäkelä <>
Date: Mon, 30 May 2016 12:59:16 +0300
Message-ID: <20160530095916.GA2224@x220>
OSun, May 29, 2016 at 02:27:58PM -0600, Terry Raymond wrote:
>Hi Marko,
>Have you decapped a lot of CBM MOS chips within the 8-bit family?

None, because I do not have suitable equipment.

Maybe some 25 years ago I destroyed a broken 6510 with a vice, just to 
see what is inside. The silicon die was about 5mm wide.

>I wasnt sure about the legality of decapping  but it seems legal?

Which law do you think would apply (other than the laws of physics)? If 
it was legal for Nintendo to use the Ricoh 2A03 that was basically a 
mask-level copy of the 6502, with some transistor(s) disabled to prevent 
the patented BCD mode from operating, then I (not being a lawyer) do not 
see any legal problem with the fine work that are doing.  
U.S. Patent 3,991,307 on the 6502 BCD mode should have expired by now 

>The only problem is recognizing each hardware component so if you would 
>have a good idea about all gates etc as far as how they are layed out 
>in the chip.

I could imagine at least two other problems before getting to that 
stage: how to remove the layers without damaging the die too much, and 
how to take sharp pictures, with no dust particles obscuring the view.  
But again, I have no practical experience in this.

>Would this be too much work to put in .pdf form if so I could just do 
>my best so I will take you up on this. contains many interesting questions and 
answers. Apparently the vectorization of the photographs, which is done 
manually, is the most time-consuming task.


       Message was sent through the cbm-hackers mailing list
Received on 2016-05-30 10:00:07

Archive generated by hypermail 2.2.0.