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8086 ASSEMBLY LANGUAGE PROGRAMMING. BY: Ms. ZEENATH 8086 Instruction Set; Assembler directives; Procedures and macros. EXTRN: External and public. Definition: Assembler directives are the instructions used by the assembler at the time of assembling a source program. More specifically, we can say, The WAIT, instruction is used to synchronize the 8086 with 8086 External Hardware Synchronization Instructions such as the 8087 math coprocessor. EXTERN is similar to the MASM directive EXTRN and the C keyword extern : it is used to declare a symbol which is not defined anywhere in the module beingThe MOV instruction copies a word or byte of data from a specified source to a specified destination. The destination can be a register or a memory location Introduction: Assembler directives are the directions to the assembler which indicate how an operand or section of the program is to be processed.