BrokenThorn Entertainment

found out the problem.

nasm was assembling "jmp boot_program" into a 2 byte opcode.
nasm-2.09.03-win32

i stuck a byte under the jmp instruction for now. awesome.

yep. the same happens with the example on chapter 4.

im guessing the problem is, the debug write command, or, i need more data for the fat12 format to work.

i have no idear though.

the examples work as boot disks, but windows and debug say the disk is unformatted, after the debug write command.

Hi again, i was here last year, i wasnt ready though :0 I thought i would try the osdev tutorial again. I have a floppy drive + disc, im using bochs, and im writing to the boot sector with the debug command. "w 100 0 0 1" <- mabey the address is wrong? The problem is, after i format the FD, then wri...

Thanks again Mike. My head is burning with all the information. I know a bit more about the Memory Models, Flat, Segmented, and Real-Address mode. And the different ways the processor accesses memory, Linear Addresses and Logical Addresses(segment:offset). I saw the descriptor tables in Tutorial 8.....

Thanks Mike. I understand most of that, but I think I wanna learn more about memory models before I get lost. At the moment im reading intel manuals, this should help understand processors a bit more. Intel® 64 and IA-32 Architectures Software Developer's Manual Volume 1: Basic Architecture Ive got ...

Hi, im new to the forum, nice work writing the OS Dev tutorial Mike, and thanks. Im quite new to assembly, usually I write in c/c++ and script based languages. From the tutorial "The BIOS loads us at 0x7C00" From the NASM manual "The function of the ORG directive is to specify the origin address whi...