The Interrupt Vector Register is also read/writable in the Memory Space of the corresponding IndustryPack slot. It is visible at any odd byte address. We recommend using an offset of $01 from the IP Memory base Address (as programmed on the VME162). The Vector Register can not be written in the ID PROM Space from the MVME162 board. The Vector Register is normally programmed by the operating system I/O driver software prior to using interrupts.