CPU vectors

When an interrupt occurs, the address of the interrupt handler is read from the vector table in bank $00. The vector used is determined by the type of interrupt and the current CPU mode. Vectors are all 16-bit and the target bank is forced to $00.

65C816 mode vectors

Vector	Address	Examples
COP	$FFE4-FFE5	COP instruction
BRK	$FFE6-FFE7	BRK instruction
NMI	$FFEA-FFEB	NMITIMEN vblank interrupt, or 5A22 /NMI input
IRQ	$FFEE-FFEF	NMITIMEN H/V timer interrupt, or external interrupt (5A22 /IRQ input)

6502 mode vectors

Vector	Address	Examples
COP	$FFF4-FFF5	COP instruction
NMI	$FFFA-FFFB	5A22 /NMI input
RESET	$FFFC-FFFD	5A22 /RESET (CPU always resets into 6502 mode)
IRQ/BRK	$FFFE-FFFF	BRK instruction, or external interrupt (5A22 /IRQ input)

Unused vectors

The 65C816 also features an ABORT vector at $FFE8-FFE9 and $FFF8-FFF9, but this is not used nor exposed by the 5A22 S-CPU.