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- ;
- ; *** Listing 3-2 ***
- ;
- ; Times speed of memory access to normal system
- ; memory.
- ;
- mov ax,ds
- mov es,ax ;move to & from same segment
- sub si,si ;move to & from same offset
- mov di,si
- mov cx,800h ;move 2K words
- cld
- call ZTimerOn
- rep movsw ;simply read each of the first
- ; 2K words of the destination segment,
- ; writing each byte immediately back
- ; to the same address. No memory
- ; locations are actually altered; this
- ; is just to measure memory access
- ; times
- call ZTimerOff