wg@alux2.ATT.COM (Bill Gieske) (03/15/89)
I have two printers attached to my Leading Edge Model D, as follows:
LPT1: dot-matrix
LPT2: HP Deskjet
For most printer output (e.g. screen dumps, ho-hum reports, etc) I want to
use the dot-matrix printer. When I want fancy, I go to the HP. Things of
this nature are produced by software smart enough to recognize printers not
on port LPT1:.
This euphoric state has been disrupted by a music score-printing program (Dr.
T's Copyist II) which only talks to the LPT1: printer. I can easily switch
the cables, but this defeats using the dot-matrix for most other instances
where this is more than acceptable.
Can I get LPT1: output to go to LPT2: for the purposes of running Copyist?
Mode won't do it - the rerouted port must be com1 or com2. Print can change
the DOS print device for the purposes of the print command, but nothing more.
I have DOS 3.1, by the way. Would a later version of DOS offer what I want?
Can I do it now without upgrading to a more recent DOS?
Any info is appreciated.
Bill Gieske
AT&T
alux2!wgtodd@stiatl.UUCP (Todd Merriman) (03/15/89)
In article <235@alux2.ATT.COM> wg@alux2.ATT.COM (Bill Gieske) writes: > >Can I get LPT1: output to go to LPT2: ........... ifdef DOCUMENTATION ; **************************************************************************** .MODULE LPT_SWAP .LIBRARY CLIB .TYPE function .DESCRIPTION Swap the mapping to LPT1 and LPT2 .ARGUMENTS void lpt_swap() .NARRATIVE Lpt_swap swaps the LPT1 and LPT2 definitions. .APPLICATION system .SYSTEM msdos .RETURNS Nothing .LANGUAGE Assembly .ENDOC END DOCUMENTATION ; **************************************************************************** endif INCLUDE \LAT\HEADER\DOS.MAC ; symbols and macros for Lattice SFRAME STRUC SAV_BX DW ? SAV_ES DW ? REG_BP DW ? ; base pointer to be pushed RTN_ADD DW ? ; offset of return address SFRAME ENDS M_LPT1 EQU 08H ; memory location for LPT1 mapping M_LPT2 EQU 0AH ; memory location for LPT2 mapping SEGMT EQU 40H ; segment for locations ; **************************************************************************** ; code ; **************************************************************************** PSEG ; begin program section PUBLIC LPT_SWAP LPT_SWAP PROC NEAR PUSH BP PUSH ES PUSH BX MOV BP,SP MOV AX,SEGMT ; load segment register MOV ES,AX MOV AX,WORD PTR ES:[M_LPT1] MOV BX,WORD PTR ES:[M_LPT2] MOV WORD PTR ES:[M_LPT2],AX MOV WORD PTR ES:[M_LPT1],BX POP BX POP ES POP BP RET LPT_SWAP ENDP ENDPS ; end program section END ; end assembly ; **************************************************************************** ; Test program ; **************************************************************************** PAGE 59,132 INCLUDE \LAT\HEADER\CSUB.MAC CODE SEGMENT PUBLIC ASSUME CS:CODE, DS:CODE, SS:CODE, ES:CODE EXTRN LPT_SWAP:NEAR ORG 100H ; .COM origin MAIN PROC FAR START: PUSH DS SUB AX,AX PUSH AX ; leave return address MOV BP,SP DISPLAY MSG CALL LPT_SWAP MOV SP,BP RET ; to DOS MAIN ENDP MSG: DB 'Swapping LPT1 and LPT2',CR,LF,CPMEOS CODE ENDS END START ; **************************************************************************** ; End LPT_SWAP.ASM ; **************************************************************************** ...!gatech!stiatl!todd Todd Merriman 404-377-8638 Atlanta, GA
jwi@lzfme.att.com (Jim Winer @ AT&T, Middletown, NJ) (03/16/89)
In article <235@alux2.ATT.COM>, wg@alux2.ATT.COM (Bill Gieske) writes: > > I have two printers attached to my Leading Edge Model D, as follows: > LPT1: dot-matrix > LPT2: HP Deskjet > ... > Can I get LPT1: output to go to LPT2: for the purposes of running Copyist? > Mode won't do it - the rerouted port must be com1 or com2. Print can change > the DOS print device for the purposes of the print command, but nothing more. > I have DOS 3.1, by the way. Would a later version of DOS offer what I want? > Can I do it now without upgrading to a more recent DOS? Use a Centronics type (parallel) X switch. (See diagram below) A probable low-cost source is CompuAdd (mail order). A switch should cost about $49 and the extra cable you will need (Centronics M to F) about $11. Also look for low cost cable suppliers in the back of PC Magazine and others. This is cheaper than the time and effort you will spend looking for a software way to do this. __ __ ______ \/ __/\__ ______ A Setting B setting Jim Winer ..!lzfme!jwi I believe in absolute freedom of the press. I believe that freedom of the press is the only protection we have from the abuses of power of the church, from the abuses of power of the state, from the abuses of power of the corporate body, and from the abuses of power of the press itself. Those persons who advocate censorship offend my religion.
cgs@umd5.umd.edu (Chris G. Sylvain) (03/16/89)
In article <3783@stiatl.UUCP> todd@stiatl.UUCP (Todd Merriman) writes: >In article <235@alux2.ATT.COM> wg@alux2.ATT.COM (Bill Gieske) writes: >> >>Can I get LPT1: output to go to LPT2: ........... >ifdef DOCUMENTATION >; **************************************************************************** >.MODULE LPT_SWAP >[...] >; End LPT_SWAP.ASM >; **************************************************************************** My program is shorter than your program!! To whit: ; What this program does: ; ---------------------- ; ; SWAPPORT.COM swaps the I/O port numbers for LPT1 and LPT2. After running ; the first time, DOS will use LPT2 when LPT1 or PRN is specified, and LPT1 ; when LPT2 is specified. Subsequent invokations reverse the situation. ; ; Program History and Attributions: ; -------------------------------- ; ; This MASM version of SWAPPORT was derived from a DEBUG script printed ; in the Q&A article of the January 1989 issue of PC Resource. The ; script was written by the PCResource Staff in response to a reader ; (Mary E. Campbell, Fort Wayne, Ind.) query. The printed DEBUG script ; includes code comments, but the instruction is to leave the comments ; out when creating SWAPPORT.SCR. This version includes comments and ; avoids using the "archaic" INT 20h DOS exit service. ; ; The entire contents of the January 1989 issue of PC Resource is ; Copyright (c) 1988 by IDG Communications/Peterborough, Inc. ; ; Motivation for using this program: ; --------------------------------- ; ; If you have two printers connected to your machine, and would rather ; not switch cables when you wish for the STDPRN device to be LPT2 ; instead of LPT1, then you will want to use this program. You can ; automate the switching back in forth in a batch file, for instance. ; ; The source code for the program: ; ------------------------------- ; PRNPoffs EQU 198h ; offset into BIOS Data Area where the LPTx ; port numbers are stored CSEG SEGMENT ASSUME CS:CSEG, DS:NOTHING ; ORG 100h ; use .COM memory layout ; START: xor AX, AX ; clear AX mov DS, AX ; set data Segment to 0000h mov SI, PRNPoffs ; DS:SI will point to BIOS printer port data mov AX, [SI] ; get LPT1 port address mov BX, [SI+2] ; get LPT2 port address xchg AX, BX ; exchange register contents mov [SI], AX ; put LPT2 address in place of LPT1 mov [SI+2], BX ; put LPT1 address in place of LPT2 mov AX, 4C01h int 21h ; exit with return code == 01 ; CSEG ENDS ; END START A uuencoded (what, archive? you must be joking :-) binary will be provided to anyone interested who is MASMless. -- --==---==---==-- .. And hast thou slain the Jabberwock? .. ARPA: cgs@umd5.UMD.EDU BITNET: cgs%umd5@umd2 UUCP: ..!uunet!umd5.umd.edu!cgs