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#uart

3 posts

RetrogamingDeep Dive October 4, 2026 9 min read

Atari Lynx ComLynx UART: Shared-Line Framing, Timer 4, and Echo

Model ComLynx as a shared UART line with fixed framing, timer-4 baud generation, self-reception, status flags, and software-controlled turn taking.

#atari-lynx#comlynx#uart

FreeDOSDeep Dive October 3, 2026 8 min read

The DOS BIOS Serial API: Programming INT 14h and Its Limits

Understand the BIOS INT 14h serial API, its register contract, status bits, polling limits, and where a FOSSIL driver or direct UART code becomes necessary.

#freedos#dos#bios

FreeDOSDeep Dive October 3, 2026 8 min read

Programming a PC UART: Register Banking, Baud Divisors, FIFOs, and Status

Configure a known 8250-compatible UART safely by managing DLAB, divisor latches, interrupt state, FIFOs, modem signals, and line errors.

#freedos#uart#serial