400-instruction Storage Interrupt (ISI).
400 -指令存储中断(ISI)。
An instruction storage interrupt is a page fault on an instruction fetch.
指令存储中断通常是指在取出指令时发生页面错误。
A program references storage using the effective address computed by the processor when it executes a storage Access or Branch instruction or when it fetches the next sequential instruction.
在程序执行Storage Access或Branch指令或者在存取下一条顺序指令时，它将使用处理器计算出的有效地址引用存储设备。
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