RSEG  ?PR?ext_int_0?PS2_INTERR_C_ASM
    USING	1
ext_int_0:
    PUSH 	ACC
    PUSH 	B
    PUSH 	DPH
    PUSH 	DPL
    PUSH 	PSW
    USING	1
    MOV  	PSW,#08H
    .
    .
    .