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Well there wasn't much to it. First to power the dongle the Genesis puts VCC (+5V) out on PIN 5 where as the ST puts VCC out on PIN 7. Thus the hack had to be around those two pins as PIN 7 on the Genesis is a SELECT line that uses a multiplex.
Simply put, I needed to unsolder and lift the PIN 5 & 7 from the PCB and bend them up. Take the PIN 7 from the DB9 (ST 5V) and wire it to the PCB PIN 5 (Dongle 5V). No other hack was needed as the floating PCB PIN 7 the select line is pulled-high and sets the dongle into thinking its got a 3 button Genesis controller thus working on the ST as an Atari. Lastly added some insulating tape between the PCB and PINs that were lifted.
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- IMG_0087.jpeg (130.4 KiB) Viewed 3929 times
The dongle looks elegant plugged into the keyboard but its just a little too long to sit in the case joystick / mouse port area. Either using it without the case or filing down 2-3mm on the corner where the 8 of the 8BitDo logo is in the picture below allows it to fit.
EDIT: look at later post where the dongle was not seated properly it does fit in the mouse / joystick area neatly.
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Well to test it all out I have been playing Magic Pockets most of the afternoon.
