IBM 102 User Manual page 22

You can set line spacing to the following lines per inch (LPI) from the
operator panel. LPI represents the number of lines to be printed per
vertical inch.
6
8.
For more information, see "Using Print Format and Quality
Parameters" in IBM 4230 Printer Models 102, 1I1, 202, 2I1, 4I3, and
5I3 Operator Panel Instructions or "Introducing the 4230 Printer" in
IBM 4230 Printer Models 102, 1I1, 202, 2I1, 4I3, and 5I3 Product
and Programming Description.
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User's Guide