Early NES Motherboard and CPU info 1985

Discuss technical or other issues relating to programming the Nintendo Entertainment System, Famicom, or compatible systems.

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Great Hierophant
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Re: Early NES Motherboard and CPU info 1985

Post by Great Hierophant » Wed Jul 08, 2015 2:00 pm

I always saw gray on my front loaders and white on my Famicom AV.

Great Hierophant
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Re: Early NES Motherboard and CPU info 1985

Post by Great Hierophant » Mon Jul 13, 2015 8:34 pm

I received a Famicom with a 2A03E and a 2C02E, and Micro Machine displays jumpiness in the the menu screens and the blue line halfway across the screen on the Title Screen. The plot thickens as to this game.

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thefox
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Re: Early NES Motherboard and CPU info 1985

Post by thefox » Mon Jul 13, 2015 9:42 pm

Great Hierophant wrote:I received a Famicom with a 2A03E and a 2C02E, and Micro Machine displays jumpiness in the the menu screens and the blue line halfway across the screen on the Title Screen. The plot thickens as to this game.
It's not news -- the game relies on OAM readback to synchronize to PPU, which is not implemented on older PPU revisions.
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lidnariq
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Re: Early NES Motherboard and CPU info 1985

Post by lidnariq » Mon Jul 13, 2015 10:41 pm

Yeah, but I thought (we thought) readback had been implemented in the 2C02E...

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thefox
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Re: Early NES Motherboard and CPU info 1985

Post by thefox » Tue Jul 14, 2015 12:33 am

lidnariq wrote:Yeah, but I thought (we thought) readback had been implemented in the 2C02E...
My bad, then. I can't keep up with the revisions. :)
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Polar Hacker
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Re: Early NES Motherboard and CPU info 1985

Post by Polar Hacker » Tue Jul 14, 2015 6:40 am

Can someone try this for me? I saw it when I was taking apart my NES yesterday. My board revision is 4. If you open the door on the toaster NES, there is a upside down number (just rotate your head to read it). Thing is, that number is also 4. Is this a coincidence, or can this tell you the board revision?

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Re: Early NES Motherboard and CPU info 1985

Post by lidnariq » Tue Jul 14, 2015 3:13 pm

Coincidence. I have two NES-CPU-07s. One has a 13 on the door (S/N N11224416), and the other has a 5 (S/N N19551709).

I'd guess that's the mold #, since any given injection mold is only good for around a million total uses before it needs to be replaced, and Nintendo made a lot more than 1M NESes.

Great Hierophant
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Re: Early NES Motherboard and CPU info 1985

Post by Great Hierophant » Tue Jul 14, 2015 5:13 pm

I guess those emulators which did not show Micro Machines correctly were not necessarily inaccurate in that respect.

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Re: Early NES Motherboard and CPU info 1985

Post by Polar Hacker » Wed Jul 15, 2015 5:55 am

lidnariq wrote:Coincidence. I have two NES-CPU-07s. One has a 13 on the door (S/N N11224416), and the other has a 5 (S/N N19551709).

I'd guess that's the mold #, since any given injection mold is only good for around a million total uses before it needs to be replaced, and Nintendo made a lot more than 1M NESes.
Shame...

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