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1.36 & 1.37 "PAL-Dendy mode" hack
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 Fixes:
  
  - PAL CPU clock = 26.601712 /15 = 1.77 Mhz
  - PPU PAL Vblank/Vsleep timings = 20/51
  - Fixes all APU rates according to Nestopia's 1.40 dendy-mode

