Hello!
I have been always working with fasm, rawrite and my floppy to create and test my boot codes. The problem just is, I have seen that nowadays, mostly if you buy a new computer, it doesn't have a floppy-drive and many people are way too busy to go to the next shop to buy a floppy just to test my OS ...

So, what I see is that many people DO have a USB pen, so how would I make a bootable OS that runs from this USB pen??
I am wanting to make a floppy-version and a USB pen version. But right now I don't have that much knowledge So please help me

Any kind of help is very appreciated!

The best way to boot from usb pen driver, is to use dos as a boot loader,
just format your pen drive wih windows and click add sys files, this will put a basic dos on the drive, then you can use autoexe to auto run your kernel or 2nd stage boot loader etc, on booting.

NOTE: Your bios needs to be able to load from usb devices.

Thanks Dex for the info!
Sorry for putting a late reply, but my ISP had some problems and my internet didn't work for 2 weeks.

But your info doesn't help me much, I'm working in a Linux distro (Debian) so I can't do what you said, but what I can now do is to study bootable CD's (I mean, everybody who buys a new computer has a CD drive )

All you need do to make a bootable CD is to get a bootable floppy or hdd image of your OS, open your burn software and click on make cd bootable.
And point the program to your image.
If you do not have a floppy driver to make a image, get someone elses image and a program like winimage and take there files out and put yours in.
And them do the above.