This is a tested and working project

The StickleBack provides a joystick port and an audio out jack for the Acorn Electron

• The joystick interface is a clone of the 'First Byte Digital Joystick Interface' standard
• Use normal 9-pin digital joysticks / joypads that follow the Atari standard (ie most home computers of the 80s and early 90s)
• Joystick interface is a clone of the 'First Byte Digital Joystick Interface' and is compatible with games which natively support it such as Frak!, Hostages, Crack-Up, Rubble Trouble etc
• Works with almost all Acorn Electron games, even keyboard only games as the software includes keyboard emulation and analogue joystick emulation support
• Works with tape and disc based games
• Easy to use in your BASIC programs
• Includes an audio out connector so you can hook-up your Acorn Electron to an external amplified device (TV, speakers etc)
• Power LED
• Pass-through connector for additional expansions

GitHub

https://github.com/oddsocks1024/StickleBack

BOM (THT)

1 x 5mm LED

1 x 330Ω Axial Resistor - ¼ watt (LED brightness, anything between 330Ω - 1KΩ is fine)

4 x 10KΩ Axial Resistor - ¼ watt

1 x 74LS138 16pin DIP

1 x 74LS367 16pin DIP

1 x 74LS30 14pin DIP

1 x 10uF Radial Electrolytic Capacitor (can be omitted if you don't care about audio out)

1 x 5-pin 3.5mm Audio Jack Socket TN/T/RN/R/S (can be omitted if you don't care about audio out)

1 x Male DE-9 Connector - right angled

1 x 50pin Edge Connector

Cartridge Case

https://www.pcbway.com/project/shareproject/StickleBack_Acorn_Electron_Joystick_Interface_Case_1205cf12.html

https://www.thingiverse.com/thing:7136809