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Atari 7800 Joystick to Sega Master System Adapter

author: 0x15e
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2 layer board of 1.54 x 0.60 inches (39.1 x 15.1 mm)
Uploaded: April 5th 2021
Shared: May 11th 2022
Total Price: $4.55

Converts the active-high button outputs and moves some pins around, allowing an Atari 7800 Proline stick or gamepad to work as a Sega Master System controller. This is particularly useful if you want to use it with a USB adapter such as the Daemonbite Sega adapter.

BOM: R1,R2: 1.8K R3,R4: 270 Q1,Q2: 2n4401 NPN transistor

The connectors are typical solder cup DE9 male / female and are attached by straddling the pins on either side of the board. This adapter is intended to fit perfectly inside a DE9 gender changer hood.

This project is released under the CC0 1.0 Universal license.

Project files and assembly instructions are available in the GitHub repo.

Converts the active-high button outputs and moves some pins around, allowing an Atari 7800 Proline stick or gamepad to work as a Sega Master System controller. This is particularly useful if you want to use it with a USB adapter such as the Daemonbite Sega adapter.

BOM: R1,R2: 1.8K R3,R4: 270 Q1,Q2: 2n4401 NPN transistor

The connectors are typical solder cup DE9 male / female and are attached by straddling the pins on either side of the board. This adapter is intended to fit perfectly inside a DE9 gender changer hood.

This project is released under the CC0 1.0 Universal license.

Project files and assembly instructions are available in the GitHub repo.

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      Hey there! Before ordering, make sure you have all all the info you need to complete and use this design. This usually means a component list, and sometimes additional information such as assembly notes, source code, or usage guides.
      Since this is a project designed by a community member, it may contain design errors that prevent it from working as intended. OSH Park cannot place any guarantees about the functionality or correctness of the design.
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