PPU Composite Voltage Survey

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Persune
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PPU Composite Voltage Survey

Post by Persune »

I'm starting a survey to document the NES/Famicom/Dendy composite voltages, mainly to expand upon the data found here in the wiki.

Requirements:
- Measurements must be the output of the console, terminated into 75 ohm resistor
- No external/modified amplifiers
- No direct measurements from pin 21
- Socketed PPUs are ok, as long as the amplifier is untouched
- RF only consoles (Toploader, RF Famicom) may measure the video input of the RF modulator (terminated to 75 ohms)

Submission format:
- owner/submitter (ex. forkram)
- console (ex. NES-001)
- motherboard rev. (ex. NTSC NES-CPU-11)
- PPU chip (ex. RP2C02G-0)
- PPU date (ex. OGL 22)
- Source of data (ex. NESDev Discord server)
- Notes (add more info here)
- quantization error (in mV)
- standard deviation (in mV)
- one may either submit an oscilloscope dump (in .csv or in single precision/double precision floating point array dump)
- or, one may submit a list of measured voltages (as seen here: viewtopic.php?p=159266#p159266)

Additional stuff:
- Blank level as reference voltage ($1D == 0V)
- Average of 16 scanlines of pure luma color via this test rom, nrom-composite-level, or 112 scanlines via 240p Test Suite's IRE test
- Data rounded to 1 mV units

Data will be published here:
https://docs.google.com/spreadsheets/d/ ... w_PoIL9N5g

P.S.: any reliable way/method to measure colorburst levels?
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