为什么截不到中断

我在2000下的设备管理器中看到usb host controller的中断资源是0x11，于是我就启动softice，bpint 11。可是无论我怎么操作我的U盘都不会进到int 11，为什么呢？？？？？

2000下的设备管理器中看到usb host controller的中断资源是0x11
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0x11是IRQ号,并不是中断向量号，所以拦不到。

Windows NT maps hardware interrupts, which by default map to vectors 8-Fh and 70h-77h, to higher numbers to prevent conflicts with software interrupts. The primary interrupt controller is mapped from vector 30h-37h. The secondary interrupt controller is mapped from vector 38h-3Fh.

Example: IRQ0 is INT30h and IRQ8 is INT38h

在SoftIce的帮助中有讲。

多谢，给分了