Kilo

this is all i have so far and i get errors for BITS... i tried surrounding them in []'s but that created an error also... im using MASM32. Am i not aloud to write 16 bit in masm32.




btw: this is a start for a boot loader

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coldDeath

I'm sorry that i cannot help, but there are a few bootloaders out there to choose from, such as LILO or GRUB. Maybe you could investigate into using one of those.

But if all you want to do for a project is make a bootloader, then forget what i said

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Kilo

for someone reason no matter what compiler i use or if i surround it with []'s [BITS 16] will create an error. Yes i do want to do this for my own project. Can someone explain how i would specify that im writing a 16 bit program?

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DaWei

Being naturally curious, I might Google it, but being naturally curious, I wonder a few things:

1) Why would one choose to write something that's obsolete before one starts?
2) Why would one choose a tool deliberately designed to move past that obsolescence?
3) Why would one choose a tool, which, if it could regress, would fail to document the procedure for doing that?

EDIT: Curiosity having gotten the best of me, I would suggest that you check out EXPR16/EXPR32, OPTION SEGMENT, .MODEL, and that portion of the documentation dealing with processors and memory models.

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Kilo

im making this boot loader for the learning... im hungry for knowledge!

i thought OPTION SEGMENT and .MODEL were used in 32 bit only?

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Scorpions4ever

BITS is a NASM directive (not MASM ). What you want is USE16
http://courses.ece.uiuc.edu/ece390/b...ml#HEADING3-42

DaWei

My MASM32 docs (just downloaded it) don't mention a USE16, like the MASM docs do. Better hope its there, anyway, or an equivalent amongst those other things.

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Kilo

using [USE16] or USE 16 does not work ... and the rest of the entire code says " must be in segment block "

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Kilo

USE16
ORG 0x7c00

main:

mov ax,0x0000
mov ds,ax
mov si,HellWorld
call PutStr

jmp $

PutStr:

mov ah,0x0E
mov bh,0x00
mov bl,0x07

.nextchar
lodsb
or al,al
jz .return
.return
ret

HelloWorld db "HelloWorld",0
dw 0xAA55

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