This is the first use people cooked up for the MITS Altair computer, which at the time could only output to its blinkenlights without expansion. Before a tiny company called Micro-Soft released BASIC for the thing, some madlad at the Homebrew Computer Club found a way to spin the CPU in loops tight enough that the interference could be picked up as tones on an AM radio, allowing for music to be created. Good to see the old traditions are still alive.

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westurner 5 hours ago | parent [-]

GSMem (2015) 1-5.5m/30m with 3G from the RAM bus

TEMLEST-LoRa (2025) 87.5m with LoRa over display cables

LoPHY (2024) 700m with LoRA

MAGNETO (2021) CPU-generated magnetic fields

"Rowhammer for qubits" describes hypothetically using electron tunneling and magnetically biased bit flips in standard RAM to simulate quantum operators.

I've heard stories of ham radio clubs teaching how to make a coaxial antenna out of coaxial cable (cable TV copper cable)

"Can you hotwire this computer to transmit a tone through the radio?" — Transformers (2007)

	▲	anfractuosity 4 hours ago \| parent \| next [-]
		Based on a repo I found that twiddled the memory bus, I transmitted audio from a wav file via Pulse Density Modulation - https://github.com/anfractuosity/musicplayer
	▲	anthk 2 hours ago \| parent \| prev \| next [-]
		>I've heard stories of ham radio clubs teaching how to make a coaxial antenna out of coaxial cable (cable TV copper cable) That's Teleco 101, basically the first lessons from a Teleco trade/vocational degree. And OFC known at any electrician degree.
	▲	mschuster91 5 hours ago \| parent \| prev [-]
		> GSMem (2015) 1-5.5m/30m with 3G from the RAM bus What the fuck, that's crazy. For those similarly bewildered, look here [1]. [1] https://www.usenix.org/conference/usenixsecurity15/technical...