ASEA BROWN BOVERI 8034308S模拟输入板
虽然这些I/O端口是为列出的功能保留的，但它们未在VMIVME-7740上实现。此处列出这些端口是为了让用户了解这些端口的标准PC/AT使用情况。PC/AT中断除了I/O端口地址之外，I/O设备还有一个单独的硬件中断线路分配。分配给每个中断线的是内存中$00000至$003FF的256向量中断表中的相应中断向量。表3-3列出了16个可屏蔽中断和单个不可屏蔽中断（NMI）及其功能。第45页的表3-4详细说明了中断向量表中的向量。表3-4中还为实模式和保护模式定义了十六进制和十进制中断数。VMIVME-7740上的中断硬件实现是围绕PC/AT架构构建的计算机的标准，该架构是从IBM PC/XT演变而来的。在IBM PC/XT计算机中，仅存在八条中断请求线，在PIC处编号从IRQ0到IRQ7。
While these I/O ports are reserved for the listed functions, they are not implemented on the VMIVME-7740. They are listed here to make the user aware of the standard PC/AT usage of these ports.PC/AT 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 3-3 along with their functions. Table 3-4 on page 45 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 3-4. The interrupt hardware implementation on the VMIVME-7740 is standard for computers built around the PC/AT architecture, which evolved from the IBM PC/XT. In the IBM PC/XT computers, only eight interrupt request lines exist, numbered from IRQ0 to IRQ7 at the PIC.
