No I am not willing to write the OS in basic.

So I got to a point where I understand the boot process of the comp. More or less. I have a bootstrap program that writes string to the monitor (by writing the video memory) and I have a stack set up.
I just don't know whats next.
I would like to have the simplest system. I dont want any FS. Is it possible to write a binary file to the floppy right after the boot sector and I load it?
Yeah... by the way.. How do I do that? I mean how do I load the app to the memory and pass control to it?

Search for info about int 0x13 functions in the BIOS. There are already many examples on this very BB of boot sectors and loaders etc.

k.. will do that

yeah, goto os construction/

vargadanis: My boot loader example may help you....

http://board.flatassembler.net/topic.php?t=6529

regards,
Ma2004

http://board.flatassembler.net/topic.php?p=69937#69937
this contain a good basis for Os development, and as you're new, i tell you this:
to speak about OS construction, there is a topic, named OS CONSTRUCTION.

Many Forth language environments support writing to "blocks", which are just tiny chunks of the disk without needing any file system.

http://www.forth.org/ (especially check out Forth compilers)

EDIT: Okay, not technically assembly-related, but Forth is pretty low level in most ways (and many are written in asm, so ...).