pervect@bsu-cs.bsu.edu (Barrett Kreiner) (01/12/90)
I'm doing something Weird, but I think it has merit. I'm trying to connect two com ports together and I'm loseing my mind. It's like this: I have a terminal on my com1 port and a modem on my com2 port. I want to use the modem from terminal. The modem is internal to the pc. I've played with the pascal async library, dosgate and writing my own drivers using bios. Dosgate and async won't play together like good programs. Async works fine, but supports only one open com port I've looked the source over.. nasty to make it support 2 open. So basically this is a general plea if ANYONE out there is smart enough to at least get my two ports talking at once please Email to me. Thanx for your support. |---------------------------------------------------------------------|-----| | Barrett Kreiner ARPA: pervect@bsu-cs.bsu.edu <-*New Address* | :-] | | Human to talk to about Ball State's Unix |--------------------------|-----| | Ball State University. Muncie, Indiana |This space left blank on purpose| |------------------------------------------|--------------------------------| | Disclamer: "I don't know them! I'm a student, nobody listens to ME!" | | Pt.2 "I graduated. I work with them now.. They STILL don't listen to me!"| |---------------------------------------------------------------------------|
u-dmfloy%ug.utah.edu@cs.utah.edu (Daniel M Floyd) (01/12/90)
In article <10561@bsu-cs.bsu.edu> pervect@bsu-cs.bsu.edu (Barrett Kreiner) writes: >I'm trying to connect two com ports ... >It's like this: I have a terminal on my com1 port and a modem on my >com2 port. I want to use the modem from terminal. The modem is >internal to the pc. I've tried ... >and writing my own drivers using bios. Dosgate and async won't play >together like good programs. Async works fine, but supports only one >open com port I've looked the source over.. nasty to make it support >2 open. So basically this is a general plea if ANYONE out there is >smart enough to at least get my two ports talking at once please Email >to me. > > Thanx for your support. >|---------------------------------------------------------------------|-----| >| Barrett Kreiner ARPA: pervect@bsu-cs.bsu.edu <-*New Address* | :-] | Three methods spring to mind (the last is best if you can): 1)Interrupts 2)Polling 3)ctty 1) If you intend to do interrupts, you have to enable both the 8259A interrupts number 3 and 4 (which correspond to interrupt vectors B and C in the BIOS respectively), and enable the ports themselves. You'll have to put in the right interrupt addresses and deal with conflicts. 2) If you do polling you may forget about the interrupts and poll com1 then com2 rapidly using the BIOS interrupt vector. 3) CTTY is a DOS command that may be just what you want. Then see if you can use your modem with the standard software. Try and see. I hope this helps and makes sense. Dan Floyd 8<D=
pmk@cip-s01.informatik.rwth-aachen.de (Michael Keukert) (01/13/90)
Try this for quick and dirty:
VAR f1,f2:File of byte;
data:byte;
ASSIGN (f1,'COM1:');
ASSIGN (f2,'COM2:');
Reset(f1);
Rewrite(f2);
REPEAT
READ(f1,data);
WRITE(f2,data);
UNTIL EOF(f1);
CLOSE(f1);
CLOSE(f2);
This shall work for the beginning...
--------------------------------------------------------------------------
Michael Keukert, Elsasstrasse 58, D-5100 Aachen 35, Phone: +49 241 513297
Twenty bucks per day plus expenses, hundred in advance. (Sam Spade)paul@actrix.co.nz (Paul Gillingwater) (01/19/90)
>In article <10561@bsu-cs.bsu.edu> pervect@bsu-cs.bsu.edu (Barrett Kreiner) writes: >I'm trying to connect two com ports ... >It's like this: I have a terminal on my com1 port and a modem on my >com2 port. I want to use the modem from terminal. The modem is >internal to the pc. I've tried ... >and writing my own drivers using bios. Dosgate and async won't play >together like good programs. Async works fine, but supports only one >open com port I've looked the source over.. nasty to make it support >2 open. So basically this is a general plea if ANYONE out there is >smart enough to at least get my two ports talking at once please Email >to me. I run a two BBS, one is PCBoard running under DOS on a PC/XT (Amstrad), the other one is a Zenith 386 running XBBS under UNIX. The Amstrad, a standard PC clone, has one serial port as standard. I simply added a modem card set to COM2:, and run Kermit via DOORWAY to access the UNIX box via COM1. This was working just fine, until I got rid of the modem card (it was not resetting correctly), and substituted a no-name serial card with external modem. Anyway, DOORWAY runs a DOOR under PCBoard which is real clever about reading the video RAM, and sends ANSI out COM2. Kermit runs OK, and you can set various options like turning of the status line and disabling drop to DOS. Because of the hardware change causing characters to be lost, we're now working on writing a solution in Pascal or Modula which will use interrupts and large buffers, allowing for different speeds to be used. I'll post the results to the net when we get it working. Stay tuned! -- Paul Gillingwater, paul@actrix.co.nz