Help collecting pictures of CPU and PPU packages
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Re: Help collecting pictures of CPU and PPU packages
I wonder if the ÷16 chips are using the 2A07 APU pitch tables for the noise and DPCM rates (nevermind which have a functioning DPCM reader...) or if they're all using the 2A03 APU pitch table.
Thank you for all of this data!
Thank you for all of this data!
Re: Help collecting pictures of CPU and PPU packages
Here's a nice photo of the D-0:Fiskbit wrote: ↑Tue Sep 27, 2022 3:40 amThe line on the RP2C02D-0 is from the Famicom eject mechanism. I have a couple more D-0's somewhere that are likely in better shape, but I was sloppy and didn't add the console serials to my spreadsheet and have an unreasonable number of Famicoms they could be in. If you can provide a better photo, fantastic!
Also, here's a photo of the RC2C05-03:
Re: Help collecting pictures of CPU and PPU packages
No problem!
I was just wondering myself if the UA6527P chips with /16 dividers could be viably used as PAL CPUs...?
Re: Help collecting pictures of CPU and PPU packages
The only significant difference left is the tuning tables, so... yeah.
I guess the other little question is: what does pin 30 do? On the 2A03G and H it enables APU test registers, and on the 2A03E we believe it's /RDY. Some of the later famiclones use it to switch between dividers, so there's lots of already-documented possibilities...
I guess the other little question is: what does pin 30 do? On the 2A03G and H it enables APU test registers, and on the 2A03E we believe it's /RDY. Some of the later famiclones use it to switch between dividers, so there's lots of already-documented possibilities...
Re: Help collecting pictures of CPU and PPU packages
Here's a couple more photos of this chip for you:loglow wrote: ↑Mon Sep 26, 2022 11:02 pmI believe it originally came out of a genuine Famicom, but I'm not certain. Other than it functioning as an NTSC PPU with a non-clone palette, I'm not sure what else to add. I suspect that it's a RP2C02E-0, for lack of a better explanation. I'm not sure if a RP2C02E (non -0) even exists?Individualised wrote: ↑Sun Sep 25, 2022 3:41 pmIs there any more context to the origins of this chip/what it exactly is?
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Re: Help collecting pictures of CPU and PPU packages
I'm honestly not even sure what to make of that. Just looks bizarre to me.
Re: Help collecting pictures of CPU and PPU packages
I just tested this and I can confirm that both of my RC2C03B chips do NOT exhibit the supposed "wrong" colors. They display the six colors (0x09, 0x11, 0x25, 0x29, 0x31, 0x39) identically to my RC2C05-03 and RC2C05-04 chips, and NOT like the linked-to representation (aka all of my tested RGB chips look like the table under "2C03 and 2C05" and NOT like the table under "RC2C03B"). Both of the RC2C03B chips have the same lot code on them: 4A4 30.lidnariq wrote: ↑Mon Sep 26, 2022 11:13 amThe RC2C03B is the one that theoretically has the slightly-wrong palette. Have you noticed this when you were using it?
Perhaps the "wrong color" anomaly is limited only to specific lot numbers?
Happy to provide any additional photos of anything you'd like.
Re: Help collecting pictures of CPU and PPU packages
Yeah, it's strange!Individualised wrote: ↑Tue Sep 27, 2022 3:58 pm I'm honestly not even sure what to make of that. Just looks bizarre to me.
The owner of pc-10.com recently mentioned to me that he's also seen several chips like this before.
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Re: Help collecting pictures of CPU and PPU packages
Excuse my ignorance, but could it be possible that it's some sort of factory sample that somehow got out?loglow wrote: ↑Tue Sep 27, 2022 4:02 pmYeah, it's strange!Individualised wrote: ↑Tue Sep 27, 2022 3:58 pm I'm honestly not even sure what to make of that. Just looks bizarre to me.
The owner of pc-10.com recently mentioned to me that he's also seen several chips like this before.
Re: Help collecting pictures of CPU and PPU packages
I don't know how to test the tuning tables or pin 30 functionality.lidnariq wrote: ↑Tue Sep 27, 2022 3:21 pm The only significant difference left is the tuning tables, so... yeah.
I guess the other little question is: what does pin 30 do? On the 2A03G and H it enables APU test registers, and on the 2A03E we believe it's /RDY. Some of the later famiclones use it to switch between dividers, so there's lots of already-documented possibilities...
I'd be happy to run any tests on any of them if you tell me the exact procedure to do so!
I have the functionality to load any ROM, monitor the video or audio output, take measurements with a multimeter, or probe any location with a scope.
Re: Help collecting pictures of CPU and PPU packages
Aside from pure speciation, I have no idea.Individualised wrote: ↑Tue Sep 27, 2022 4:06 pmExcuse my ignorance, but could it be possible that it's some sort of factory sample that somehow got out?
Re: Help collecting pictures of CPU and PPU packages
I feel like I'm missing something here. Nintendo used heatspreaders like this on many PPUs, with the chip name stamped into the metal. Attached is an image from Lockster (cropped down a bit to fit on the forum) with B and D examples.
Re: Help collecting pictures of CPU and PPU packages
Cool, I didn't know
I don't think *you're* missing anything, I just wasn't aware of this!
Re: Help collecting pictures of CPU and PPU packages
Ah, gotcha. I mentioned the B and D heatspreaders earlier, but I think it must've gotten lost in the thread!
Nintendo was very worried about PPU heat. Many early PPUs have some kind of rubber heatsink under the chip, others have these heatspreaders, and anything in an always-on environment (including NTSC chips, such as in the FamicomBox) has a proper metal heatsink.
Nintendo was very worried about PPU heat. Many early PPUs have some kind of rubber heatsink under the chip, others have these heatspreaders, and anything in an always-on environment (including NTSC chips, such as in the FamicomBox) has a proper metal heatsink.
Re: Help collecting pictures of CPU and PPU packages
More photos of things!
The wiki is missing a couple of these (RP2C07, UA6541) and the other existing ones (RP2A07, RP2A07A, UA6540) aren't of great quality.
The wiki is missing a couple of these (RP2C07, UA6541) and the other existing ones (RP2A07, RP2A07A, UA6540) aren't of great quality.