How to debug the read sector

[gaiety]

Ok, so far my bootstrap has able to boot and print a welcome message. So, now it is time to read the kernel image file. I have a few question.

CPU: Pentium 433hz
Compiler: Nasm

#1 How to debug the sector we read is the correct sector. I am new to OS and asm and it is the first time I use bios read. Any idea how to debug it. I am planing to read multi sector by using al = number of sector to read.

#2 I am using bochs. However, I need to create a floppy image, how to manage the file in the image. Any software that is free(If easy to use is the better) for use. I have download winimage but it is a limit time software.

#3 there is any example for simple os that I can download, the os I have is freedos, but the code is too hard for me. Any simple OS that is still in developing? I found some example of os but most of it is bootstrap. Thank you.

Thank you for answer my question.

[Pype.Clicker]

#1 How to debug the sector we read is the correct sector. I am new to OS and asm and it is the first time I use bios read. Any idea how to debug it. I am planing to read multi sector by using al = number of sector to read.

A simple trick is to load the sector in video memory first, then move it somewhere else.
A more evolved trick consist of checksumming the sectors you've loaded once the load is complete.

#2 I am using bochs. However, I need to create a floppy image, how to manage the file in the image. Any software that is free(If easy to use is the better) for use. I have download winimage but it is a limit time software.

all we have has been collected in the "Working with Disk Images" page on the Wiki.

#3 there is any example for simple os that I can download, the os I have is freedos, but the code is too hard for me. Any simple OS that is still in developing? I found some example of os but most of it is bootstrap. Thank you.

Thank you for answer my question.

Here again, we have the "small OS with source" page on the wiki.

http://www.osdev.org/osfaq2/

[bubach]

As you are developing in asm at the moment, maybe my small OS can be of any service? (current realesed version does not have any user input.. )
Check the URL in my signature.
As for my "new" version 0.03 that should be up with the new page http://bos.asmhackers.net/ in a couple of days or so, a small shell is included.