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BOOTCODE.INC question, Why the repetition?

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Luc

Posted: October 19, 2009 10:58 am

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Group: Members
Posts: 1
Member No.: 2081
Joined: October 19, 2009

Hi,

I am new to ASM so please bare with me if the answer is obvious. I am studying the code of MenuetOS 32, and in the file BOOTCODE.INC there are the following lines:

CODE

; Draw welcome screen

call setbase1000

Looking at setbase1000, what it does is:

CODE

push ax
mov ax,0x1000
mov es,ax
mov ds,ax
pop ax

ret

So 0x1000 is loaded into ES and DS. My question is why, knowing that this was done previously in:

CODE

; Reset 16 bit selectors, registers and stack

mov ax,0x1000
mov es,ax
mov ds,ax

Am I missing something?
Thanks.

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