Answer: The Base Address for the AVME9660 is defined by the user through the use of a series of jumper on the board. The carrier board interfaces with the VMEbus as a 1K byte block of address locations in the VMEbus short I/O address space. J1 decodes the six most significant address lines A10 through A15 to provide segments of 1K address space. The configuration of the jumpers for different base address locations is shown in Table 2.1 of the manual. "IN" means that the pins are shorted together with a shorting clip. "OUT" indicates that the clip has been removed.