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▀ If the printer is busy, this function waits until the printer is ready
  to accept the character.
 
▀ There is no standardized way to poll the status of the printer under
  MS-DOS.
 
▀ If a CTRL+C is detected at the keyboard, an Int 23H is executed.
 
▀ You can also send strings to the printer by performing a write (Int 21H
  Function 40H) using the predefined handle for the standard printer
  device (0004H) or using a handle obtained by opening the logical device
  PRN or LPT1.
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