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

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