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Assembly question

Posted on 2000-05-15
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Last Modified: 2010-04-02
Why this failed?

data segment

data ends

mov ds,data <--fail ?

tks!
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Question by:zystudio
[X]
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8 Comments
 
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Accepted Solution

by:
Wyn earned 200 total points
ID: 2812053
Beause you can not move imme to ds directly ,change it to:

mov dx ,data
mov ds,dx

Regards
Eirnava...
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Expert Comment

by:nietod
ID: 2812058
try

MOV AX,DATA
MOV DS,AX

continues
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LVL 22

Expert Comment

by:nietod
ID: 2812062
Opps, 1 minute too late

The reason is that there is no instruction for moving an immediate value to a segment register.  There is one for moving an immediate to a GP register, like AX (or DC in Wyn's case), so you move the segment value (which is an immediate or constant value) to the GP register and then move the value in the GP register to the segment register.
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LVL 22

Expert Comment

by:nietod
ID: 2812068
Note using AX instead of DX will be 1 byte shorter and potentially a little faster.
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Author Comment

by:zystudio
ID: 2812072
Thank you ,nietod and Wyn ...How can I give the points ??

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LVL 5

Expert Comment

by:Wyn
ID: 2812085
oh, sorry ,nietod ...
zystudio , nietod's answer is better ,reject me ..

Regards to you both...
Eirnava
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Author Comment

by:zystudio
ID: 2812116
Nietod , I  post another question for you ,thank you and Wyn!!


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Expert Comment

by:nietod
ID: 2812507
>>  nietod's answer is better ,reject me ..
Thanks, although mine was insignificantly smaller and insignifcantly faster, but assembly programs tend to worry about those things...
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