ch6ex1.asm

a example for asm, for beginer to stady asm

			dat	    SEGMENT
				    a11			DB 12H
				    bb			DW 3456H 
				    source_buffer	DB 48H
			dat	    ENDS

			extra	SEGMENT
				    dest_buffer	DB 40 DUP(?)
			extra	ENDS

			code	SEGMENT
				    ASSUME	CS:code, DS:dat, ES:extra
		start:
					MOV		AX, dat
					MOV		DS, AX
					MOV		AX, extra			;CS不用赋值
					MOV		ES, AX

					;MOV		AX, 1000H
					;MOV		DS, AX					
					;MOV		SI, 50H
					
					LEA		SI, source_buffer
					MOV		AL, [SI]
					AND		AL, 0FH
					MOV		[SI + 1], AL
					MOV		AL, [SI]
					MOV		CL, 4
					SHR		AL, CL
					MOV		[SI + 2], AL

					MOV		AX, 4C00H
					INT		21H
			code	ENDS
					END start