Radio Shack TRS-80 Model II Reference Manual page 208

Model II
TRSDOS
Exit Conditions
The current character count and current line count are set to zero.
TRSDOS
assumes
that the paper is already at the top of form when this routine is called.
"Dummy" and "Transparent" printer modes are both returned to "Normal" .
(See
SVC PRCTRL.)
The serial/parallel and auto linefeed options are unchanged by
PRINIT.
User Notes
I.
TRSDOS
maintains current line-on-page and current character-in-line counts
regardless of which initialization settings are used. See
SVC PRCTRL
for further
details on these counts.
2. The printer need not be ready when
PRINIT
is called.
3. Whenever
TRSDOS
is started (reset or power-on), this initialization is done
automatically, with the following parameters:
Parameter
(PRINIT
register)
Page Length (B
= )
Printed lines/page (C
= )
Max. characters/line (D = )
The other options set during initialization are:
Parallel printer
Non-auto line feed
Non-dummy
Non-transparent
244
Value
66
60
132