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.global ___udivhi3 ___udivhi3: stz <r0 ldy #1 ldx <r4 lda <r5 div1: asl a bcs div2 iny cpy #17 bne div1 div2: ror a div4: pha txa sec sbc 1,s bcc div3 tax div3: rol <r0 pla lsr a dey bne div4 rtl