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The MOV instruction copies a word or byte of data from a specified source to For multi-bit rotates, CF will contain the bit most recently rotated out ofIN and OUT transfer data between an I/O device and the microprocessor's accumulator (AL, AX or EAX). · Register DX as a 16-bit I/O address (variable addressing). If required to access port number over 255 - DX register should be used. Example: MOV AX, 0FFFh ; Turn on all. OUT 4, AX ; traffic lights. MOV AL x86 Instruction Set Reference. OUT. Output to Port if(PE == 1 && (CPL > IOPL || VM == 1)) { //Protected mode with CPL > IOPL or virtual-8086 mode if(! Data Transfer instruction ; IN, Transfers data from a port to the accumulator or AX, DX or AL register. ; OUT, Transfers data from accumulator or AL or AX