CODEWITHSUNDEEP
asciiassemblymasmtasm
CppLearner
CppLearner

Reputation: 17040

ASCII code interpretation (assembly)

First of all, thanks for all the help thus far.

Complete code can be found here

I have trouble understanding these lines. I wrote some comments...

The line, for example, mov es:[si+6], al means move data in al to the memory address marked by si+6 (I think this would be an offset calculation).

Then what is add si,40 in the loop?

Any helps mean everything to me! Thank you.

L0_95:         ; this segment prints ASCII code 0 - 95
mov si,6       ; refers to the string we declared at the beginning
mov cx,4       ; I think this is the height?

C1A:
; this loop adds the name of the column
mov al,string[0]
mov es:[si],al
mov al,string[2]
mov es:[si+6],al
mov al,string[4]
mov es:[si+24],al
mov al,string[6]
mov es:[si+28],al
add si,40           ;;;; what is this line?
loop C1A

mov si,122          ;;;; and these three lines?
mov bx,0
mov cx,4
C1B:push cx  

mov cx,24
add si,40
C1C:push cx
call DEC_CONVERT
add si,2
call HEX_CONVERT
add si,2
call BIN_CONVERT
add si,2
call CHAR_CONVERT
inc bx
add si,126
pop cx
loop C1C
pop cx
sub si,3840
loop C1B

ret

L96_191:

Upvotes: 0

Views: 904

Answers (1)

wallyk
wallyk

Reputation: 57764

add si advances the si register by 40.
mov si,122 sets the si register to 122, probably the address of some data. The remaining two instructions should now be self-explanatory.

Upvotes: 2

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