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Copyright © 2017–2023 J. M. Spivey
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[8] Introducing I/O. Memory-mapped I/O. GPIO. Multiplexed LED display.

[9] Serial I/O. Serial protocol. A simple, polling UART driver.

[10] Programming with interrupts. Interrupt-based driver for UART.

[11] The interrupt mechanism. What the hardware does with interrupts.