Instructions | Simple Universal Modem

1

Send gerber files from Github to your favorite PCB manufacturer

There's a zip with all the usual layers
2

Source components

Hopefully you have most in your junk pile
3

Solder away!

..in a well ventilated area.
4

Set jumpers according to "the manual" on the PCB back and your cable/audio device
5

Connect power, audio and your computer/MCU

Connect 5V/GND, your FSK-encoded square wave to DataOut - DOut (Pin 5), and connect DataIn - DIn (Pin 7) to an input pin on your computer/MCU (Preferably interrupt capable).
6

Use Minimodem to generate modulated data for your device/mcu/microcomputer

Or use 6502 assembly code from #ABN6502 SBC R1 to save/load data. Or write code for Arduino etc. Or wait for me to do it.

Simple Universal Modem