《Operating System Concepts》学习第 43 天，p491-p494 总结，总计 4 页。

一、技术总结

1.controller

A controller is a collection of electronics that can operate a port, a bus, or a device.

2.memory-mapped I/O

A device I/O method in which device-control registers are mapped into the address space of the processor.

二、英语总结(生词：1)

1.notion

(1)notion: *gno-("to know")

c/u. an idea.

(2)示例

The complete protocol for interaction between the host and a controller can be intricate, but the basic handshaking notion is simple(《Operating System Concepts》第 493 页)。。

关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。

三、其它

今天没有什么想说的。

四、参考资料

1. 编程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英语

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

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