ex1.asm

a example for asm, for beginer to stady asm

			NAME	    ex1
			PAGE	    50, 70
			
			DAT	    SEGMENT   PARA  'DAT'
				    A1	DB 12H, 34H, 56H, 78H, 9AH
				        DB 0BCH, 0DEH, 0F0H
				    B1 = $ - A1
				    B2 = B1 * 2
				    A2  DB  B2  DUP(?)
			DAT	    ENDS
			
			STAC    SEGMENT  PARA  STACK 'STA'
				    STA1  DW  100 DUP(?)
			STAC    ENDS
			

			CODE	SEGMENT PARA 'CODE'
				    ASSUME	CS:CODE, DS:DAT
				    ASSUME      SS:STAC, ES:DAT
		        STAR    PROC    FAR
		        		PUSH		DS
		        		XOR		AX, AX
		        		PUSH		AX
					MOV		AX, DAT
					MOV		DS, AX
					MOV		ES, AX
					
					LEA		SI, A1
					LEA		DI, A2
					MOV		CX, B1
			G1:		MOV		BL, 2
					MOV		AL, [SI]
					MOV		BH, AL
					PUSH		CX
					MOV		CL, 4
					ROR		AL, CL
					POP		CX
			G2:		AND		AL, 0FH
					DAA
					ADD		AL, 0F0H
					ADC		AL, 40H
					MOV		[DI], AL
					INC		DI
					MOV		AL, BH
					DEC		BL
					JNZ		G2
					INC		SI
					LOOP		G1
					MOV		SI, OFFSET  A2
					MOV		CX, B2
					CALL		P1
					RET
					
			P1		PROC
					MOV		BL, 2
			G:		MOV		DL, [SI]
					MOV		AH, 2
					INT		21H
					INC		SI
					DEC		BL
					JNZ		T
					MOV		DL, 48H
					MOV		AH, 2
					INT		21H
					MOV		DL, ' '
					MOV		AH, 2
					INT		21H
					MOV		BL, 2
			T:		LOOP		G
					RET
			P1		ENDP
			CODE		ENDS
					END		STAR