#include <dos.h>

int SBDetect(void);
void SBSendByte(unsigned char b);

/*
  Soporte de Sound Blaster
*/

unsigned  BPORT = 0x210,
	  XPORT = 0x216,
	  WPORT = 0x21C,
	  RPORT = 0x21A,
	  APORT = 0x21E;

char      READY = 0xAA;

int SBDetect(void)
{
  char Status,Ct;

  Status = 0;
  while (Status!=READY && BPORT<0x270)
  {
    outportb(XPORT,1);
    outportb(XPORT,0);
    Ct = 0;
    while (Status!=READY && Ct<100)
    {
      Status = inportb(RPORT);
      Ct++;
    };
    if (Status!=READY)
    {
      BPORT += 0x10;
      XPORT += 0x10;
      WPORT += 0x10;
      RPORT += 0x10;
      APORT += 0x10;
    }
  }
  if (BPORT!=0x270)
  {
      while ((inport(WPORT) & 128) != 0);
    outportb(WPORT,0xD1);
    return(0);
  }
  else return(-1);
}

void SBSendByte(unsigned char b)
{
    while ((inport(WPORT) & 128) != 0);
  outportb(WPORT,0x10);
    while ((inport(WPORT) & 128) != 0);
  outportb(WPORT,b);
}