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Assembly Source File  |  1990-02-15  |  299 b   |  15 lines
  1. ;
  2. ; *** Listing 9-9 ***
  3. ;
  4. ; Times the performance of two 16-bit register DEC
  5. ; instructions.
  6. ;
  7.     mov    dx,2000
  8.     call    ZTimerOn
  9. TestLoop:
  10.     dec    dx    ;subtract 2 from DX by decrementing
  11.     dec    dx    ; it twice (2 bytes long, uses
  12.             ; 2 16-bit-register-specific DECs)
  13.     jnz    TestLoop
  14.     call    ZTimerOff
  15.