PPU Patent #4,824,104?

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PPU Patent #4,824,104?

Post by SuperFXMaster » Mon Jul 22, 2013 9:22 am


I'm planning on doing some FPGA NES, but have a bunch of questions.

Am I a dumb or the PPU Patent information #4,824,106, FIG 7 is somewhat wrong in some places? (OBJ 0 Hit evaluation, EXT errors, wrong clock signals, etc.)

At the schematic of the "Synthesizer" portion of the PPU (FIG 8):
Does it exists a manner to discover the exact values of resistors 117-1 to 117-9 in that resistor ladder? I know they're on-chip, but I wanna have composite output from my unit, and an external board with this resistor ladder, with its input connected to the gates at the left, and output to the TV set. Would it be possible, or I will have to calculate them based on PPU output voltages?

Thanks in advance.

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Re: PPU Patent #4,824,104?

Post by qbradq » Thu Aug 01, 2013 6:08 am

You'd have a lot better response in the Hardware subforum.

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Re: PPU Patent #4,824,104?

Post by Bregalad » Thu Aug 01, 2013 6:40 am

As far as I know, patents just show the early ideas, before they were implemented. They could have changed numerous things between the patent and the final product. So patents are a terrible "source of information" in this regard. They could be interesting to see how they came up with ideas though.

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