Microcontroller › PIC › How to interface RFID with PIC18F4550 Microcontroller › When writing code in C, PIC
When writing code in C, PIC only calls one ISR function for all of its interrupts i.e. function with name interrupt(); (here). It is then on the coders side to write such a code that could decide which interrupt to focus on and execute its function(s).
I do not think we can change ISR's address as it is predefined inside the chip.