Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 05h
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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 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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