Datamax Prodigy Operator's Manual page 139

O: Identifies the Code 93 bar code. Code 93 is an upper and lower
case alpha numeric bar code. The normal ratios that the Printer
can print are 1:1, 2:2, 3:3, 4:4, 6:6, and 8:8. These numbers
actually specify size of magnification and are element based; not
ratio based. The ASCII characters that are permissible for Code
93 are ":,&#0$%*+ABCDEFGHIJKLMNOPQRSTUVWXYZ
0123456789abcdefghijklmnopqrstuvwxyz".
203 DPI Printer 152 DPI Printer
Appendix D Page D-23