N: SIO Command 'S' Status

N: SIO Command READ ($53) ['S']

Description

Return the status of the currently opened protocol channel, in the following format:

Offset	Description
0	LO Byte of # of bytes waiting
1	HI Byte of # of bytes waiting
2	0=Disconnected, 1=Connected
3	Extended Error code

It is expected that the buffer point to the DVSTAT location in the OS ($02EA)

Parameters

DCB	Value
DDEVIC	$71
DUNIT	$01 - $04
DCOMND	$53 'S'
DSTATS	$40
DBUF	DVSTAT
DTIMLO	$0F
DBYT	4
DAUX1	N: Status DAUX1 Values
DAUX2	N: Status DAUX2 Values

Examples

CC65

  // Get # of bytes waiting
  OS.dcb.ddevic=0x71;
  OS.dcb.dunit=1;
  OS.dcb.dcomnd='S';
  OS.dcb.dstats=0x40;
  OS.dcb.dbuf=&status;
  OS.dcb.dtimlo=0x0f;
  OS.dcb.dbyt=4;
  OS.dcb.daux=0;
  siov();

  bw=(status[1]<<8)+status[0];
  connected=status[2];

See Also

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