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TITLE primo
data SEGMENT
    num1 DB 7
    sum  DB ?
data ENDS
code SEGMENT
    assume CS:code, DS: data
    inizio: MOV AX, data
            MOV DS, AX
            MOV AL, num1
            ADD AL, 4
            MOV AH, 04CH
            INT 21h
        code ENDS
        END inizio

prog.s: Assembler messages:
prog.s: Warning: end of file not at end of a line; newline inserted
prog.s:1: Error: no such instruction: `title primo'
prog.s:2: Error: no such instruction: `data SEGMENT'
prog.s:3: Error: no such instruction: `num1 DB 7'
prog.s:4: Error: no such instruction: `sum DB?'
prog.s:5: Error: no such instruction: `data ENDS'
prog.s:6: Error: no such instruction: `code SEGMENT'
prog.s:7: Error: no such instruction: `assume CS:code,DS:data'
prog.s:8: Error: too many memory references for `mov'
prog.s:9: Error: too many memory references for `mov'
prog.s:10: Error: too many memory references for `mov'
prog.s:11: Error: too many memory references for `add'
prog.s:12: Error: too many memory references for `mov'
prog.s:13: Error: junk `h' after expression
prog.s:13: Error: operand size mismatch for `int'
prog.s:14: Error: no such instruction: `code ENDS'
prog.s:15: Error: no such instruction: `end inizio'

Standard output is empty