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 Post subject: PAL APU DMC Rates
PostPosted: Thu May 04, 2006 3:08 am 
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Joined: Mon Sep 27, 2004 8:33 am
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Location: Central Texas, USA
I've just started doing some tests on a PAL NES donated by Eli Dayan. Here are the DMC rates I've measured, along with the NTSC ones for comparison (rates in decimal):

Code:
Rate  0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
     ---------------------------------------------------------------
NTSC 428,380,340,320,286,254,226,214,190,160,142,128,106, 84, 72, 54
PAL  398,354,316,298,276,236,210,198,176,148,132,118, 98, 78, 66, 50


Each value is the number of CPU clocks each sample bit lasts for. I arranged the table so you can copy and paste directly into your code. The ratios of PAL / NTSC vary from 0.916667 to 0.965035, averaging 0.931442. This is about what was expected based on the PAL/NTSC CPU clock ratio of 0.92894.


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PostPosted: Fri May 05, 2006 2:04 am 
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Thanks.

Not meaning to nag, but are you also planning to test the frame sequencer timing?


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PostPosted: Fri May 05, 2006 5:08 am 
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Yes, I plan on checking other APU differences, then moving on to the composite video signal. I don't really care that much about PAL, but it would be nice to go ahead and document the major differences.


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