I want schematics of the original MOS 6502, but gate level. I don't know how to read silicon and understanding transistor schematics is so hard for me. Where can I find these?

to be honest, I don't think such a thing exists. If nothing else, the original NMOS 6502 relies on transistor functionality that cannot be represented in terms of pure logic gates.

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Yes, AFAICT much of it was designed at transistor level - and all of it was implemented at transistor level. No cell libraries, no ready-made NOR gates. Every transistor size considered. And indeed, some transistor-level circuits which don't readily admit a logical equivalent.

A major portion (or maybe all) of what they mean by "transistor functionality that cannot be represented in terms of pure logic gates" is that there are a lot of transistors used as bidirectional signal switches, through which signals can pass either direction, acting much like a 4066 analog switch IC.

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Forum member 'org' did a lot of work aiming to create a logic level description of 6502:
viewtopic.php?f=8&t=2208

I don't know if it was completed, or if it was then well-tested. At least, it gives an idea of how much work it is to do this.

Another approach would be to take a well-regarded HDL model, such as Arlet's, and extract a logic-level description from the FPGA tools. It will not be pretty, and will not be a recreation of the original 6502 design, but it will be just as accurate in its behaviour as the HDL model.

Which raises an important question. LBSC, do you consider it necessary to reproduce the behavior of some or all of the NMOS undefined opcodes?

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

There's also Andrew Holme's FPGA implementation, built from netlists extracted from Visual6502: http://www.aholme.co.uk/6502/Main.htm (announced on 6502.org here: http://forum.6502.org/viewtopic.php?f=10&t=4295).

Oh, well remembered! I'd forgotten that effort. The end result is logic, in verilog form, very closely matching the 6502 implementation, looking like this:


Which probably underscores the point that what a minecraft re-implementer probably really wants is something nicely laid out in two dimensions. I think that work is work which is yet to be done. Designing and laying out a 6502 in minecraft might be about as much work as originally laying it out in ruby lith - which is not to say it can't be done, just that it is a big project. But I don't know, perhaps there are tools to help.