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 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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