Deep Dive: Kansas City Standard Cassette Storage
Building a Kansas City Standard cassette peripheral: FSK at 2400/1200 Hz, tape transport simulation, and why saving 8 KB takes five minutes.
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Deep Dive: Bell 103 Audio Modem and FSK Implementation
Implementing the 1962 modem standard behind 300 baud dialup: FSK modulation, Goertzel demodulation, and the two-band split that makes full duplex work.