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Text File  |  1993-05-13  |  1.0 KB  |  51 lines
  1. /*
  2.     SPHINX Programming (C) 1993.
  3.     TITLE:  SOUND.H--
  4.     DESCRIPTION:  This file contains a collection of procedures for using
  5.                   the built in PC speaker.
  6.     LAST MODIFIED:  13 May 1993
  7.     PROCEDURES DEFINED IN THIS FILE:
  8.         : void NOSOUND()
  9.         : void SOUND(frequency)
  10. */
  11.  
  12.  
  13. : void NOSOUND ()
  14. /*
  15. Silences the speaker.
  16. */
  17. {
  18. $IN AL,0x61                              
  19. AL &= 0xFC;                              
  20. $OUT 0x61,AL                              
  21. } 
  22. /* RETURNS:  AL = undefined
  23. */
  24.  
  25.  
  26.  
  27. : void SOUND ()  /* AX = frequency */
  28. /*
  29. Starts the speaker emiting a sound of a given frequency
  30. */ 
  31. {
  32. BX = AX;
  33. DX = 0x12;
  34. AX = 0x34DC;
  35. $DIV BX                                 
  36. BL = AL;
  37. AL = 0xB6;
  38. $OUT 0x43,AL                              
  39. AL = BL;
  40. $OUT 0x42,AL                              
  41. AL = AH;
  42. $OUT 0x42,AL                              
  43. $IN AL,0x61                              
  44. AL |= 3;
  45. $OUT 0x61,AL                              
  46. }
  47. /* RETURNS:  AX,BX,DX = undefined
  48. */
  49.  
  50.  
  51. /* end of SOUND.H-- */