.define _open .extern _open .text _open: tst.b -40(sp) link a6,#-0 move.w 12(a6), d2 ext.l d2 move.l d2,-(sp) move.l 8(a6),-(sp) jsr __Sopen add.l #8,sp unlk a6 rts __Sopen: trap #0 .short 0x5 bcc 1f jmp cerror 1: rts