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When you use 'int 10h', you are telling your BIOS that you want to change the display mode to whatever mode is in register ah.
It is possible your hardware's graphic mode 9 is not the same as it is in Boch's. In this case you may be displaying pixels rather than text or something like that and the pixel may be too dim or small to see. Make sure you are using the right modes with your 10h interrupt. (I do know it works now, though.)
Just a thought.
P.S. Remember, usually in text mode one memory location is the character and right next to it are the color settings. Putting a string into memory on your gfx card won't usually work.
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