Datamax Prodigy Operator's Manual page 133

G: Identifies the truncated EAN-8 bar code. Numeric-only bar
code; fixed in length. Seven digits supplied by host or
application software, 8th digit supplied by the Printer. If the 8th
digit is sent by the host, the Printer will check that character
against the calculated checksum and will print the bar code as all
zero if they do not match. Addendum codes for this font are
described by fonts M and N. The normal ratios that the Printer
can print are 1:1, 2:2, 3:3, 4:4, 6:6, and 8:8. These ratios actually
specify size of elements since EAN type bar codes are element
based and not ratio based.
203 DPI Printer 152 DPI Printer
Appendix D Page D-17