Hi, The SM90 uses the PLU (item) keyboard to enter characters. If you look on page 3 or 4 (from memory), you will see a keyboard layout. Look at the bottom of the buttons and you can see the alphabet. this is for character entry when you are in the programming mode for text entry. Sometimes it is printed on a separate programming card that must be held over the PLU section while typing. People often lose these, but you can make a new one by drawing squares on a piece of paper and writing the letters in to the squares using the manual as a guide.
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