Sharp X68000 Keyboard Connector
While this system might be fairly rare outside of Japan, it's currently enjoying a bit of a revival inside Japan. Many popular MegaDrive and SNES games were released for it, and almost always had the better version. Featuring a Motorola 68000 processor (same as the Atari ST, Amiga and Macintosh) with dedicated sound and video processors, the games available for it were pretty phenomenal. Here's the Mouse pinout, see here for the keyboard port, here for the floppy port, here for the 3D port and here for the RGB port.
	Pin Function 1 +5v 2 Mouse Control 3 Mouse Data 4 Ground 5 Ground

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