Deep Dive: Kansas City Standard Cassette Storage
Building a 1976-era cassette peripheral—FSK encoding at 2400/1200 Hz, tape transport simulation, and why saving 8KB took six minutes.
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Deep Dive: Bell 103 Audio Modem and FSK Implementation
Implementing the 1962 modem standard that made 300 baud dialup possible—FSK modulation, Goertzel demodulation, and the two-band trick that keeps full‑duplex honest.