10        S_MBK   &H00008FFF 20~Wrd     /* WORD write
20        PRINT   MBK(20~Wrd)           /* unsigned WORD read 
30        PRINT   MBK(20~Int)           /* signed WORD read 
40        OUT   -1 -1~Wrd               /* WORD write
50        PRINT   IN(-1~Wrd)            /* unsigned WORD read 
60        PRINT   IN(-1~Int)            /* signed WORD read 
RUN

 36863                                  /* unsigned
 -28673                                 /* signed
 65535                                  /* unsigned
 -1                                     /* signed