All info taken from http://emudocs.org/Genesis/

Click on pictures to enlarge

|{{:schematics:genesis_cpu_and_custom_chips.png?300|}}|{{:schematics:genesis_sound_and_video.png?308|}}|{{:schematics:genesis_block_diagram.png?315|}}|
|  CPU and Custom Chips  |  Sound and Video  |  Block Diagram  |