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Assembly Source File  |  1990-02-15  |  250b  |  14 lines
  1. ;
  2. ; *** Listing 4-8 ***
  3. ;
  4. ; Measures the performance of repeated SUB AL,AL instructions,
  5. ; which take 3 cycles each according to Intel's official
  6. ; specifications.
  7. ;
  8.     sub    ax,ax
  9.     call    ZTimerOn
  10.     rept    1000
  11.     sub    al,al
  12.     endm
  13.     call    ZTimerOff
  14.