nes-cpu-01 mainboard

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12Sack007
Posts: 3
Joined: Sat Jan 15, 2022 10:33 am

nes-cpu-01 mainboard

Post by 12Sack007 »

Any info on a 1985 nintendo nes-cpu-01 mainboard? Is it early or rare? Was found in a smooth top case with a N0056746 serial number.
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: nes-cpu-01 mainboard

Post by lidnariq »

Redherring recently managed to borrow and reverse-engineer the differences in the rev 1 and 2 NES mainboards. In his github: https://github.com/Redherring32/OpenTen ... -01_02.pdf

As far as scarcity: the first, and quite rare. As far as that being interesting? Not at all.
12Sack007
Posts: 3
Joined: Sat Jan 15, 2022 10:33 am

Re: nes-cpu-01 mainboard

Post by 12Sack007 »

Thank you from that information. Guess I need to keep this for the start of my collection. Just got to get it working properly. The color is off. I mostly noticed red is pink. It looks like someone may have already worked on it. Is has a pair of ceramic disk capacitors soldered on the av out jacks. That seemed weird to me. Also has two green jumper wires on the bottom of the board.
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: nes-cpu-01 mainboard

Post by lidnariq »

Those green jumpers are stock, correcting for a design flaw.
StevieGoodwin
Posts: 8
Joined: Mon Aug 13, 2018 5:52 pm

Re: nes-cpu-01 mainboard

Post by StevieGoodwin »

That's a nice find man. :D By the way, what's the color of the screen of your NES-CPU-01 when you turn it on with no game when it blinks?
For example my NES-CPU-02 blinks a gray screen when it's turned on with no game. I had a NES-CPU-01 board that flashed a blue screen with no game at one point back in March 2021 which i found in serial N0092700 from a NES in really bad shape before the RF box died of smoke due to old age and replaced my motherboard with a perfectly good NES-CPU-02 from a donor system.
StevieGoodwin
Posts: 8
Joined: Mon Aug 13, 2018 5:52 pm

Re: nes-cpu-01 mainboard

Post by StevieGoodwin »

12Sack007 wrote: Sat Jan 15, 2022 3:07 pm The color is off. I mostly noticed red is pink. It looks like someone may have already worked on it. Is has a pair of ceramic disk capacitors soldered on the av out jacks. That seemed weird to me. Also has two green jumper wires on the bottom of the board.
Those two green jumper wires by the way are actually normal for a NES-CPU-01/02 board. And for the colors being off, you're not the only one with this issue. My NES-CPU-02 is like that as well. For example, In Mike Tyson's Punch Out on a CPU-01-02, the green ring where you fight Mike Tyson is like a darker green rather than a lighter green like on later systems. And Mike Tysons glove on the CPU-01-02 looks more like a maroon color than a normal red color. On SMB1, the bricks in the underground levels look more like a greenish color than a teal color.
lidnariq
Posts: 11432
Joined: Sun Apr 13, 2008 11:12 am

Re: nes-cpu-01 mainboard

Post by lidnariq »

The very early NES mainboards have a 2C02E PPU, instead of the 2C02G PPU most others do. These behave differently in a bunch of ways, although we haven't written all the differences up yet.
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