Printronix MVP Series - Manual (Page 136)

Programming 7–12
06H — Lines per Inch Spacing
Use this code to shift from 6 lpi to 8 lpi. The 8 lpi switch must be inactive. In
modes 002, 003, or 004 (not modes 001 or 005), the spacing can be changed
to 9 or 10 lpi by configuring Option 51. Control Code 06 hex must be
included in every line to be printed with 8, 9 or 10 lpi spacing or the spacing
reverts to 6 lpi. The 8 LPI indicator lights when 8, 9 or 10 lpi spacing is
selected by the code in the data stream (with the switch inactive) or when the
8 LPI switch is pressed.