315-5309

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The 315-5309 is found on early revision of the MegaDrive I.

It handle the IO port and the version register

Pinout

OpenOffice Draw file : File:315-5309.odg

  • IOX_X: To the DE-9 port
  • FREQ: +5V = 60Hz, 0V = 50Hz
  • LANG: +5V = English, 0V = Japanese
  • A0-A6: 68K address bus
  • D0-D15: 68K data bus
  • ZA0-ZA7: Z80 address bus
  • ZD0-ZD7: Z80 data bus