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Interrupt 9? I used to have my own int 9 handler for games I worked on with my xt compatible machine.
I also once hooked up a button to my serial port and wrote a function to "listen" for the button press, then output the contents of the displayable video area to a file.. not recommended! lmao. But it's in the theme of this thread and it was pretty nifty, lol. I could capture screenshots when a game or program wouldnt allow any other keypresses.
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