Commodore MPS-801 User Manual page 46

APPENDIX C PRINTER Code Table
GRAPHIC MODE Code & Font Table
Note: When an odd number of CHR$(34) is detected
in
a line, the control
codes $00""$ IF and $80-$9F will be made visiable by printing a
reverse character for each of these controls. This will continue until
an even number of quotes (CHR$(34» has been received or until
end of this line.
40.