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SubjectRe: Searching for string problems
On Wed, 23 Apr 2003, Andrew Kirilenko wrote:

> Hello!
>
> Big thanks to all of you. Now I'm starting to understand how it's working.
> Here is current version of my code:
>
> -->
> jmp cl_start
> cl_id_str: .string "STRING"
> cl_start:
> cld
> movw %cs, %ax
> movw %ax, %ds
> movw $0xe000, %ax
> movw %ax, %es
> movb $0, %al
> xor %bx, %bx # start of segment
> cl_compare:
> movw $cl_id_str, %si
> movw $cl_start, %cx
> subw %si, %cx
> decw %cx
> movw %bx, %di
> repz cmpsb
> je cl_compare_done_good
> incw %bx
> cmpw $0xffff, %bx # are we at the end of segment
> je cl_compare_done
> jmp cl_compare
> cl_compare_done_good:
> movb $1, %al
> cl_compare_done:
> <--
>
> And this code won't work as well :(
>
> Unfortunately, I can't start DOS and check, cause there is no video and
> keyboard controller on that PC.
>
> Best reagrds,
> Andrew.

Change this:

movw $0xe000, %ax

To:
movw $0xf000, %ax

... like I told you. The BIOS ROM contents, the stuff that has the
serial number _must_ start where I told you.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips).
Why is the government concerned about the lunatic fringe? Think about it.

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