Numeric
The Rmargin switch sets the right margin for word wrapping. It has an effect only when word wrapping is turned on.
Rmargin:78
In PWB 1.x, Rmargin sets the beginning of a six-character “probation” zone where typing a space wraps the line. After the zone, typing any character wraps the current word. This behavior is similar to that of a typewriter. PWB 2.00 uses a word-processor's style of wrapping.
To maintain the same margins as PWB 1.x, increase your Rmargin settings by 6.
Softcr, Wordwrap