An exert from an 18F datasheet:
When the IPEN bit is cleared (default state), the interrupt priority feature is disabled and interrupts are compatible with PICmicro mid-range devices. In
Compatibility mode, the interrupt priority bits for each source have no effect. INTCON<6> is the PEIE bit, which enables/disables all peripheral interrupt sources. INTCON<7> is the GIE bit, which enables/disables all interrupt sources. All interrupts branch to address 000008h in Compatibility mode.
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