CSEG	AT	00003H
AJMP	ext_int_0
RSEG  ?PR?ext_int_0?PS2_INTERR_C_ASM
	USING	0
ext_int_0:
	PUSH 	ACC
	PUSH 	B
	PUSH 	DPH
	PUSH 	DPL
	PUSH 	PSW
	MOV  	PSW,#00H
	PUSH 	AR0
	PUSH 	AR1    ;dont need this onwards
	PUSH 	AR2
	PUSH 	AR3
	PUSH 	AR4
	PUSH 	AR5
	PUSH 	AR6
	PUSH 	AR7    ;~30us wasted after ISR invocation
	USING	0