Anders Nielsen’s Easy Univeral Modem Saves Your Classic Pc’s Information to Virtually Any Audio Gadget



Classic computing fanatic Anders Nielsen has launched design recordsdata for a “Easy Common Modem,” designed to permit knowledge to be saved from nearly any computing system to nearly any medium able to recording audio — after which loaded again into the pc once more.

“This little board has all the things it is advisable to save knowledge from a retrocomputer, a PC, a microcontroller, or absolutely anything else you may consider,” Nielsen explains of the mission. “On the opposite aspect of issues it will save knowledge to just about any media that may document and play audio.”

For those who’ve a necessity to save lots of or load classic computing knowledge, Anders Nielsen’s Easy Common Modem might help. (📹: Anders Nielsen)

Measuring simply 50×15mm (round 1.97×0.59″) and utilizing a minimal of parts, the Easy Common Modem incorporates a five-stage resistor-capacitor (RC) filter and emitter-follower buffer transistor, which takes the sq. wave of a digital pc’s binary logic and modulates it to a sine-like wave prepared for recording. As soon as recorded, the info may be performed again and loaded into the unique supply system — or some other.

“Caveats embody that you just nonetheless need to generate a sq. wave and never only a serial sign,” Nielsen admits, “however the constructive aspect to that’s that you’re much less locked in to a sure baud fee (contemplating the TX [Transmit] RC filter may also be modified with new values), including to the universality of the board.”

In addition to with the ability to save and cargo knowledge of your personal, Nielsen means that modem may show useful for these performing a little bit digital archaeology or knowledge restoration. “When you have some outdated tapes mendacity round with invaluable knowledge from the 70s or 80s,” he explains, “the Easy Common Modem, will make it tremendous straightforward to learn the info with a contemporary MCU [Microcontroller], Arduino, [or] Raspberry Pi, because it has an encoding agnostic demodulation interface.”

Whereas the modem is designed to be universally relevant to nearly any system able to loading software program, Nielsen constructed it primarily to be used together with his ABN6502 single-board pc (SBC) — the most recent revision of which we checked out two months in the past.

Full particulars can be found on the mission’s Hackaday.io web page, with Gerbers, KiCad mission recordsdata, and schematics obtainable on GitHub beneath the Artistic Commons Attribution-NonCommercial 4.0 Worldwide license.

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