PS TEXT FORMAT Reference Manual

TFORMCVT: Converting From TGAL to TFORM
E-14 11387 Tandem Computers Incorporated
Tips
If ARROW is ON, the TFORM command to turn on a box becomes SET
BOX ON ARROW.
If the box sides were redefined, TFORMCVT outputs the command
DEFINE BOX when turning off the box, restoring the original box-side
characters.
TFORM automatically indents the text within a box, as though the
command INDENT ON BOTH + 3 were present. Since this is not the
case in TGAL, TFORMCVT emits the command INDENT ON BOTH - 3
when turning on a box and INDENT OFF BOTH when turning it off.
If the TAG command applies to lines in a box, the tags appear further
to the right than tags on unboxed lines because of the negative
indentation.
TGAL suppresses line joining within the scope of a box. Since TFORM
allows joining in boxes, TFORMCVT issues a SET JOIN OFF command
at the beginning of a box (if it was on) and turns joining back on at the
end of the box. For example:
TGAL input:
\JOIN ON
\BOX
There once was a man from Peru
Whose limericks ended at two
\BOX
TFORMCVT output:
\JOIN ON
\SET BOX ON; JOIN OFF
There once was a man from Peru
Whose limericks ended at two
\SET BOX OFF; JOIN ON
A BOX command controlled by an IF command is not recommended,
since TFORMCVT does not keep track of a box that has been turned on
or off under such control.