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Power-Programmierung
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CD1.mdf
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assemblr
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library
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zenlib
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lst4_12.asm
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Assembly Source File
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1990-02-15
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535b
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22 lines
;
; *** Listing 4-12 ***
;
; 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