I have just found this interesting project:
http://www.visual6502.org/JSSim/index.html
 <http://www.visual6502.org/JSSim/index.html>
This allows you to debug M6502 machine code on the silicon level. It needs
the latest browser as it uses HTML5 as opposed to Java or JavaScript if I
understood well from the page.

They have a so called expert version of the debugger (also free):
http://www.visual6502.org/JSSim/expert.html


Also you can find photos of the layers here:
http://www.visual6502.org/images/6502/index.html

Tamas
--=20
int main() { char *a,*s,*q; printf(s=3D"int main() { char *a,*s,*q;
printf(s=3D%s%s%s, q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }",
q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }
--=20
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