kdb允许用户控制内核代码的执行(包括内核扩展和设备驱动器)，并观察和修改变量和寄存器。
KDB allows the user to control execution of kernel code (including kernel extensions and device drivers), and to observe and modify the variables and register.
在总线上的每个控制器可以被CPU所单独寻址，这是软件设备驱动程序能写入寄存器并能控制这些控制器的原因。
Each controller on a bus can be individually addressed by the CPU, this is why the software device driver can write to its registers and thus control it.
MAI管理设备控制器内的所有状态寄存器，并且通过8位并行数据线与设备端mcu进行数据交换。
MAI, which manages all the control status registers, exchange data with MCU through 8-bit data bus.
从设备的观点看，例如软盘控制器，它只能看见其控制寄存器所在的(ISA)空间的地址，不能看到系统主存。
From the point of view of the device, say the floppy disk controller, it will see only the address space that its control registers are in (ISA), and not the system memory.
从设备的观点看，例如软盘控制器，它只能看见其控制寄存器所在的(ISA)空间的地址，不能看到系统主存。
From the point of view of the device, say the floppy disk controller, it will see only the address space that its control registers are in (ISA), and not the system memory.
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