BYTE RTCLOK=20,  ; addr of sys timer›     SAVMSCL=88, ; lsb of screen addr›     SAVMSCH=89, ; msb››     I,J,TIME    ; declare variables›     ›CARD SCREEN››PROC BENCH()››  GRAPHICS(24)›  RTCLOK=0››  SCREEN=SAVMSCL+256*SAVMSCH››  FOR I=0 TO 31›    DO›    FOR J=0 TO 239›      DO›      POKE(SCREEN+J,255)›      OD›    SCREEN==+240 ›    OD››  TIME=RTCLOK››  GRAPHICS(0)›  PRINTF("%E %U JIFFIES",TIME)››RETURN›