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The modular avionics suites in the next generation aircraft, the F-22 Advanced Tactical Fighter and the RAH-66 Comanche, have been specifically defined by JIAWG to provide the highest levels of commonality and interoperability. Both of these programs have chosen the Intel i960®MX as their processor of choice. In order to support the needs of system integrators for early hardware and software prototype development, Tronix has created the PI960MX-JXV JIAWG Execution Vehicle. The PI960MX-JXV JIAWG Execution Vehicle is the first board product to combine the i960MX Instruction Set Architecture (ISA) with the Pi Bus Backplane protocol and a MIL-STD-1553B serial data bus. In addition, the PI960MX-JXV JIAWG Execution Vehicle fully supports the Ada language tools and emulators from the leading Ada vendors. This paper describes the system architecture of the Tronix PI960MX-JXV via block diagrams and system descriptions.