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Text File  |  1986-08-13  |  647 b   |  26 lines  |  [TEXT/ttxt]
  1. * 
  2. *    Sound Demonstration Program
  3. *    written for the Boston MacWorld Expo
  4. *    using the Macintosh Programmer's Workshop
  5. *
  6. *    © 1986 Fred A. Huxham
  7. *
  8. *------------------------------------------
  9. *    This is some assembly language glue
  10. *    to setup and restore register A5 around
  11. *    the call to our Vertical Retrace Task
  12. *------------------------------------------
  13. *
  14.     INCLUDE 'SysEqu.a'
  15.  
  16.     IMPORT    mySoundVBL
  17.     
  18. VBLGlue    PROC        EXPORT
  19.         MOVEM.L        A4-A5/D4-D7,-(SP)        ;Save our Registers
  20.         MOVE.L        CurrentA5,A5            ;Restoring A5
  21.         JSR            mySoundVBL                ;Jump to our VBL Task
  22.         MOVEM.L        (SP)+,A4-A5/D4-D7        ;Restore our Registers
  23.         RTS                                    ;and return
  24.         ENDPROC
  25.         
  26.         END