Use an arduino Nano/Uno and wire the gameboy link cable according to the pinout shown below. Do not destroy old genuine gameboy link cables for this purpose, there is plenty new cables you can ...

Your nano should now be ready for wiring the connection. Creating custom cables. There are 2x parts to wiring. nano to psx cable; nano to LGV via RJ45 cable; I used a cable from a broken ps2 ...

The Nano, on the other hand, comes in the smallest form factor Arduino offers, with the same 18 mm width but a shorter length at 45 mm and lighter weight at 7 g.

Connect pin 5V and GND pins of Arduino Nano to +5 and G pin of Ethernet Module respectively (These connections supply power to the Ethernet Module). Connect pin 9, 10, ... (PC and Arduino) together, ...

A Modulino library for Arduino and MicroPython is available, and pre-configured Arduino Cloud templates. The Arduino Nano Connector Carrier is sold on the Arduino store for $11.80 US or 13.3 Euros .