Tally T5023+ Programming Manual page 194

Important notes on document processing Additional commands (Printer)
With the horizontal leading edge on the right, the right character box limit of the
90th character (with character spacing of 10 characters/inch) lies on the right
edge of the document. This means that print position 89 of the 90th character
lies 1/10 inch to the left of the right edge of the document (method of counting:
print position 0 for the 1st character, print position 1 for the 2nd character, etc.).
With character spacing of 12 characters/inch, print position 107 for the 108th
character lies 1/12 inch to the left of the right edge of the document accordingly:
Proceeding from these specifications, print position 0 can be calculated by coun-
ting backwards. The printing unit width of 90/10 inch must always be considered.
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T5023/5023+ - Programming Guide