A programmable interrupt controller connected to a microprocessor has a register for storing a prevailing vector which is the highest priority vector in service in the microprocessor system. When the microprocessor is executing an interrupt routine, if the programmable interrupt controller or a second...http://www.google.de/patents/US5603035?utm_source=gb-gplus-sharePatent US5603035 - Programmable interrupt controller, interrupt system and interrupt control process
