in the majority of cases the main XTAL seems to be 6.000 http://mamedev.emulab.it/haze/misc/guitar_blob.JPG … http://mamedev.emulab.it/haze/misc/guitar_rom.JPG … with the Rockstar Guitar I can't even see another one. Sean has the "I can Play" games so you'll have to ask him on those. Some have PAL / NTSC subcarrier XTALS
@MameHaze What are the measured clocks for icanpian and those guitar games? The 27MHz standard comes from the datasheet, but I'm open to the idea that different systems are clocked differently.
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this is why I'm wondering if 27 is generated internally instead.
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