In the context of this book, a debug monitor.

在这本书的上下文中，是指调试监视器。

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ROM emulator ACTS very much like a debug monitor, except that it includes its own serial or network connection to the host.

ROM模拟器动作起来象一个除错监视器，除了它包含自己连到主机上的串口或网络外。

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The debug monitor provides a set of primitive commands to view and modify memory locations and registers create and remove breakpoints and execute your program.

除错监视程序提供一个简单的命令集来显示和内存地址和寄存器、建立和移除断点，并且运行你的程序。

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