Megadrive 1 PCB

Megadrive 2 PCB

Megadrive sound

This recording is from an unmodified Megadrive 1 and was recorded from the headphone connector:
jesper_kyd_redzone_datarum_md1.ogg

And this one is recorded from Megadrive 2 (rev 315-5660), unmodified (see pictures above):
jesper_kyd_redzone_datarum_md2.ogg

Here is an recording made by TmEE from Megadrive 2 (rev 315-5660-02), his MD2 is modified (see pictures below for schematics) the humming in the background is caused by a bad cable when recorded:
jesper_kyd_redzone_datarum_md2_modified.ogg