EMU41 Advanced Printer Applications :

EMU41 makes available a virtual printer device by routing data to the LPT1
parallel printer port. Use the following short routine MARGIN for  selecting
the printer and for setting the left margin by a short ESC sequence. Than
use the well known HP-41 standard commands for printing like  PRP or PRA.

 01_LBL "MARGIN"
 02 "PRINTER"
 03 FINDID
 04 SELECT
 05 MANIO
 06 "_&a08L" ; 027 038 097 048 056 076  set left margin
 07 OUTA
 08 END

The EXT-IL-ROM makes possible multi column prints of HP-41 user code
software programs: First execute MARGIN. Now CF 00 (standard with of a
column  = 22 characters). Enter 3 to X-Register (= three columns) and
execute MCPRP (identical to the standard PRP command). At the prompt switch
to  Alpha-Register and enter the program name for printing. For creating a
six column print run the following program SIXCOL than execute MCPRP and
enter the program name.

 01_LBL "SIXCOL"
 02 "PRINTER"
 03 FINDID
 04 SELECT
 05 MANIO
 06 "_&a06L" ; 027 038 097 048 054 076  set left margin
 07 OUTA
 08 "_&k2S"  ; 027 038 107 050 038  compressed print mode
 09 OUTA
 10 SF 00    ; only 120 / 6 = 20 characters per column
 11 120
 12 ENTER^
 13 6
 14 END

The SKWIDBC-ROM makes possible fast HP-41 barcode plots. First select the
printer by 2 SELECT,  MANIO. Enter 13 to X-Register (=13 program bytes  plus
header bytes per line), and SF 00 (Laser Jet printer mode). Enter the
program name to Alpha-Register and execute PROGBC....