NES console revisions

[NES_Rules]

I did a little bit of research on my 6 spare NES consoles, and there are a few slight variations I've found.
The differences are copyright years on the board, the board's part #, and the number of screws holding down the shield. The boards also seem to all have the same components, just slightly reorganized.

Serial #          Copyright         Board Part #         # of screws
N20170596       1986               NES-CPU-04             7
N0722522         1986               NES-CPU-04             7
N10601195       1987               NES-CPU-04             ?
N2750626         1987               NES-CPU-06             7
N12358433       1987               NES-CPU-07             7
N27335096       1987               NES-CPU-10             7
N21630969       1987               NES-CPU-10             7
N27290693       1987               NES-CPU-10             7
N30328117       1987               NES-CPU-11             7
N14277583       1989               NES-CPU-08             8
N28859435       1987               NES-CPU-11             7

I'm trying to find a pattern between the Serial # and the copyright and board part #, but I don't have enough consoles info, I've got 4 more systems to check, but I'll still need more, so anyone with an NES I would appreciate it if you could check your system for these criteria.

[Tan]

Feel free to add those to all of the U.S. NES console pages under the "Revisions" tab

[Sega2099]

I'll check when I get a chance

[jamespmt]

Serial #            Copyright     Board Part #     # of screws
N30328117      1987            NES-CPU-11            7

I'll check my other two when i get a chance.

(When messing around with your nes always unplug it then press the power button on and off a couple off times.)

[ApolloBoy]

Here's mine:
Serial #            Copyright     Board Part #     # of screws
N0722522         1986            NES-CPU-04            7

[Beardcore84]

I'll check when I get a chance

Your signature is atrocious.

[Sega2099]

You know my sig is sexy boii

[Izret101]

I'll see if i can get to mine when i get home.
Very cool though. What made you decide to check this all out?

[Izret101]

Serial #           Copyright         Board Part #         # of screws
N10601195        1987             NES-CPU-04                 

Could only get to one of my NES for now.
Not sure on the number of screws it could be 7 it could be 8 but i took this apart so long ago i don't remember anymore.

[NES_Rules]

What made you decide to check this all out?

Logical123 made a thread about NES console variants and I told him there were differences in the number of screws holding down the shield, as that was one I knew of off the top of my head.
And then I happened to be taking apart several NES systems to clean and noticed the different other stuff on them. I tried to find a pattern relating the serial # to the copyright year or board #. But I didn't have enough to find a pattern, so I made a post in Logical's thread and eventually it got moved to a separate thread.


And thanks to those who have contributed to this, it's much appreciated.