Neo Geo to Sega Genesis / Megadrive / Master System controller adapter
thingiverse
An enclosure for this open source adapter PCB: https://oshpark.com/shared_projects/qSqtcGAw I use a standard DB15 male connector for the Neo Geo half and the female plug end from a Sega Genesis / DB9 extension cord, salvaging the strain relief from the unused male end. You may want to modify the enclosure if you wish to go about this differently. Other things you may want to get are a mini slide switch SPDT to toggle between Megadrive/Master System mode: https://www.aliexpress.com/item/32796706769.html And four 2.5m 8mm screws to keep the enclosure held together. A tip to put this all together nicely: place the DB15 connector and slide switch into place on one enclosure half, then slide the PCB into position and tack solder in.
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