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        model  SMALL
        stack  100
 
        dataseg
MAX	db ?
MB      db     4,7,11,23,5
 
        codeseg
        startupcode
 
        lea    BX, MB    
        mov    CX, 5    
BEG:
        mov    AL, [BX]
	mov    DL, [BX]
	and    AL, 240
	shr    AL, 4
	and    DL, 15
	xor    AL, DL
	mov    [BX], AL
        add    BX, 1
        loop   BEG 
	mov    CX, 4
	mov    AL, [BX]
	mov    BX,0
 
	BEGIN:
        xor AL, [BX+1]
	add BX, 1
	loop BEGIN
 
QUIT:   exitcode  0
        end
 

prog.s: Assembler messages:
prog.s:1: Error: no such instruction: `model SMALL'
prog.s:2: Error: no such instruction: `stack 100'
prog.s:4: Error: no such instruction: `dataseg'
prog.s:5: Error: no such instruction: `max db?'
prog.s:6: Error: no such instruction: `mb db 4,7,11,23,5'
prog.s:8: Error: no such instruction: `codeseg'
prog.s:9: Error: no such instruction: `startupcode'
prog.s:11: Error: too many memory references for `lea'
prog.s:12: Error: too many memory references for `mov'
prog.s:14: Error: invalid char '[' beginning operand 2 `[BX]'
prog.s:15: Error: invalid char '[' beginning operand 2 `[BX]'
prog.s:16: Error: too many memory references for `and'
prog.s:17: Error: too many memory references for `shr'
prog.s:18: Error: too many memory references for `and'
prog.s:19: Error: too many memory references for `xor'
prog.s:20: Error: invalid char '[' beginning operand 1 `[BX]'
prog.s:21: Error: too many memory references for `add'
prog.s:23: Error: too many memory references for `mov'
prog.s:24: Error: invalid char '[' beginning operand 2 `[BX]'
prog.s:25: Error: too many memory references for `mov'
prog.s:28: Error: invalid char '[' beginning operand 2 `[BX+1]'
prog.s:29: Error: too many memory references for `add'
prog.s:32: Error: no such instruction: `exitcode 0'
prog.s:33: Error: no such instruction: `end'

Standard output is empty