Board layout based on furrtek schematic: http://furrtek.free.fr/?p=crea&a=cartflash as he haven't since time released a typon. There is one issue thought: the connector size, i don't know it, so i have no idea if my board layout will fit in a real neo geo pocket.
/!\ Don't produce for the moment /!\
or if you have a caliper and a NGP cartridge, feel free to correct the board size and rearrange connectors You need also a cpld or another Uc to pass the verification check.