If you have an upper case character you can force it to lower case by setting bit five to one. If you have a lower case character and you wish to force it to upper case, you can do so by setting bit five to zero. You can toggle an alphabetic character between upper and lower case by simply inverting bit five. Note that you cannot convert a string of numeric characters to their equivalent binary representation by simply stripping the high order nibble from each digit in the string. 010203h, not the correct value which is 7Bh.
Most printers support the PC's extended character set.
Some machines, like the Apple Macintosh, do not provide native support for the extended IBM-PC character set. However you may obtain a PC font which lets you display the extended character set. Worse still, different machines often use these control codes in different ways. End of line is a particularly troublesome example. Apple Macintosh, Apple II, and many other systems mark the end of line by a single CR character.