IBM 6500 User Manual page 170

Prop. Spacing (Proportional Spacing)
Each printed character is contained inside a character cell. The width of the
character cell includes the character and the space around the character.
v Disable (the default). Each character cell is printed with the same width. Each
v Enable. The width of each character cell varies with the width of the character.
Bold Print
v Disable (the default). Text is printed normally.
v Enable. Text is printed with a heavy line thickness.
Slashed Zero
This parameter allows you to print the numeral "0" with or without the slash. This
option applies to all character sets except OCR-A and OCR-B.
v Disable (the default). Zero is printed without a slash.
v Enable. Zero is printed with a slash.
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Infoprint 6500 User's Manual
column in the printed text will line up.
This example is printed with
proportional spacing disabled
For example, [i] takes less space to print than [m]. Using proportional fonts
generally increases the readability of printed documents, giving text a typeset
appearance.
This example is printed with
proportional spacing enabled