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     FUNCTION IsSB AS INTEGER
      DIM SBdetected AS INTEGER
      BasePort = &h220
      SBdetected = -1
      WHILE (BasePort <= &h280) AND (SBdetected = -1)
       SBdetected = DspReset
       IF SBdetected = -1 THEN BasePort = BasePort + &h20
      WEND
      IsSB = SBdetected
     END FUNCTION

     FUNCTION DspReset AS INTEGER
      DIM STAT AS INTEGER
      OUT BasePort + &h6,1
      FOR CT% = 1 TO 100 : NEXT
      OUT BasePort + &h6,0
      STAT = 0 : CT = 0
      WHILE (STAT <> &hAA) AND (CT < 100)
       STAT = INP(BasePort + &hHE)
       STAT = INP(BasePort + &hHA)
       CT = CT + 1
      WEND
      IF STAT = &hAA THEN DspReset = 0 ELSE DspReset = -1
     END FUNCTION

     FUNCTION LineLinksVol AS INTEGER
      OUT Baseport + 4, &H2E
      LineLinksVol = INT(INP(Baseport + 5) / 16)
     END FUNCTION

     FUNCTION LineRechtsVol AS INTEGER
      OUT Baseport + 4, &H2E
      LineRechtsVol = INT(INP(Baseport + 5) AND 15)
     END FUNCTION

     SUB SetLineVol (Links, Rechts)
      OUT Baseport + 4, &H2E
      OUT Baseport + 5, Rechts + Links * 16
     END SUB
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