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1 .387
2                 PUBLIC  MXWAITRETRACE
3 MX_TEXT         SEGMENT PARA PUBLIC USE16 'CODE'
4                 ASSUME CS:MX_TEXT, DS:DGROUP, SS:DGROUP
5 MXWAITRETRACE:
6         mov             dx,3daH
7 L$1:
8         in              al,dx
9         test            al,8
10         je              L$1
11         retf
12 MX_TEXT         ENDS
13                 END