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Interrupts
System Interrupts
In addition to an I/O port address, an I/O device has a separate hardware interrupt
line assignment. Assigned to each interrupt line is a corresponding interrupt vector in
the 256-vector interrupt table at $00000 to $003FF in memory. The 16 maskable
interrupts and the single Non-Maskable Interrupt (NMI) are listed in Table 2-3 along
with their functions. Table 2-4 on page 47 details the vectors in the interrupt vector
table. The interrupt number in HEX and decimal are also defined for real and
protected mode in Table 2-4 on page 47.
The interrupt hardware implementation on the is standard for
computers built around the PC architecture, which evolved from the IBM PC/XT.
打断
系统中断
除了I/O端口地址外，I/O设备还有一个单独的硬件中断
线路分配。分配给每个中断行的是一个相应的中断向量
256矢量中断表的内存为$00000到$003FF。16个面具
中断和单个不可屏蔽中断（NMI）如表2-3所示
以及它们的功能。第47页的表2-4详细说明了中断向量中的向量
桌子十六进制和十进制的中断数也定义为实数和小数
保护模式见第47页表2-4。
上的中断硬件实现是
基于PC体系结构构建的计算机，该体系结构由IBM PC/XT演变而来。
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