Debug Script Help

I was just on the phone with a nice man at a computer support company ( Flow Chart Reader)

I was stunned when out of the blue he sent me an e-mail with a "debug script"

The script is as follows

I haven't got alot of experience with debug can anyone determine what its supposed to do ?


_________________________________________________________________________

type "debug" at the command prompt

Your prompt will be a dash "-"
Note that you do NOT type the xxxx:xxxx.These are representations of a hex
number that the debug program returns after A CS:100
PRESS RETURN AT THE END OF EACH LINE.

F 200 L1000 0

A cs:100

xxxx:xxxx mov ax,301

xxxx:xxxx mov bx,200

xxxx:xxxx mov cx,1

xxxx:xxxx mov dx,80 (or 81 if it is the slave HDD)

xxxx:xxxx int13

xxxx:xxxx int20

xxxx:xxxx (press enter for blank line)

- g (to execute the program. JUST TYPE THE LETTER, NOT -)

- q (quit Debug)

Hi mark

The bios INT 13 instruction gives access to disk I/O instructions(basically). I can figure out what it does as ax,301 ?? is i guess hadware specific. Also you forget to mention why he sent you this script.

AFAIK int13 lets you read/write/reset your drives. Int20 is to signal the end of the program.

Supposedly to check a faulty hard disk.

I think he may just be wasting my time.

Tried to explain to him if I wanted to jump through hoops I would join the circus.

Looks like he's trying to blank (fill with 0s) the track 0, sector 1, head 0, disk 1 (or 2). I guess he wants you to reset the boot sector of your harddisk (probly something like fdisk /mbr). What's the problem? You can't boot from the harddisk or what?

Peace always,
<jdenny>

This will zero out the Master Boot Record/Partition Table.
It can be useful in cases where you have a corrupted
MBR and you want to start from scratch with a fresh
empty sector(for instance, if you had a virus in there
that couldn't be cleared by FDISK/MBR)

He shouldn't have given it to you without a good
explanation and instructions though. It will not
test your drive, it will effectively erase it.

http://www.firmware.com/support/bios/hdclear.htm
:cool: