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In article <9593@dasys1.UUCP> jzitt@dasys1.UUCP (Joe Zitt) writes:

   Is there a way to fake out a PC into talking to a different COM port?

Yes and no.  Due to the lack of of interrupt driven COM port service
in the BIOS, everyone directly accesses the 8250.  So the only way to
do what you want is to patch your program to use the different COM port.
This can be non-trivial.
--
--russ (nelson@clutx [.bitnet | .clarkson.edu])
I'm a right-to-lifer -- everyone has a right to earn a living sufficient to
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In article <9593@dasys1.UUCP> jzitt@dasys1.UUCP (Joe Zitt) writes:
>
>   Is there a way to fake out a PC into talking to a different COM port?
>

Part of the Baker's dozen utility set is a program called swcom12.com.  I
haven't tried it, but the documentation is:

    } SWCOM12.COM
    } -----------
    } Switch RS-232 ports for COM1 and COM2.  No parameters.
    } 
    } To start:
    } C>swcom12

I'd post, but the package has to be distributed as a whole.  
Bakers Dozen is shareware, so you might be able to find it on a
local bbs, or you can contact the author(?)/distributor directly at:

                    Jim Button                      
                  P.O.  Box 5786                   
                Bellevue, WA 98006                   
                  1-800-JBUTTON.                          

--
Bob Posert
I'm: posert@bonnie.ics.uci.edu or {sdcsvax|ucbvax}!ucivax!bonnie!posert 

In article <9593@dasys1.UUCP> jzitt@dasys1.UUCP (Joe Zitt) asks: 
>Is there a way to fake out a PC into talking to a different COM port?

The dos assign command should work.  I've seen it used to tell something to
send to COM1 everything that was supposed to go to lpt: so your mileage may
vary.

Basically, before you are going to use the modem, enter the following line:

assign com1 = com2

If this doesn't work, reverse the com1 and com2.  I haven't used the command
for a long time, so....


-- 
tkopp@carroll1.cc.edu  or  uunet!marque!carroll1!tkopp
Thomas J. Kopp @ Carroll College 3B2 - Waukesha, WI

In article <412@carroll1.UUCP> tkopp@carroll1.UUCP (Tom Kopp) writes:
>In article <9593@dasys1.UUCP> jzitt@dasys1.UUCP (Joe Zitt) asks: 
>>Is there a way to fake out a PC into talking to a different COM port?
>
>The dos assign command should work.  I've seen it used to tell something to
>send to COM1 everything that was supposed to go to lpt: so your mileage may
>vary.
>
>Basically, before you are going to use the modem, enter the following line:
>
>assign com1 = com2
>
>If this doesn't work, reverse the com1 and com2.  I haven't used the command
>for a long time, so....
>
>
>-- 
>tkopp@carroll1.cc.edu  or  uunet!marque!carroll1!tkopp
>Thomas J. Kopp @ Carroll College 3B2 - Waukesha, WI




I was having the same problem with a Zenith 248 that came with a funky 
adaptor that plugged into one of the bigger ports on back and had two ports
on the other side of it - I forget the specifics, but the effect was that
with the adaptor, the modem could not be plugged into COM1 but only COM2
which was on the back of the adaptor.

Anyway, I tried the DOS assign command and I believe that command is only
useful for assigning a COM port to an LPT port and possibly vice versa.  It
did not work assigning one COM port to another COM port.

I ended up yanking the stupid adaptor off of there.

-- 
    ---{john hayes}  Old Dominion University; Norfolk, Virginia USA
                     internet: aiko@cs.odu.edu
                     Home: (804) 622-8348     Work: (804) 460-2241 ext 134  

                      <++++++++++++++++++++++++++++++++++>
Are you a Have or a Have_Not?  Because if you're a Have_Not, you've probably
had it; whereas, if you're a Have, you've probably got it and are going to 
give it away at some point in the future!       --- The Clash
                      <++++++++++++++++++++++++++++++++++>

In article <412@carroll1.UUCP>, tkopp@carroll1.UUCP (Tom Kopp) writes:
> In article <9593@dasys1.UUCP> jzitt@dasys1.UUCP (Joe Zitt) asks: 
> >Is there a way to fake out a PC into talking to a different COM port?
> Basically, before you are going to use the modem, enter the following line:
> assign com1 = com2

MSDOS's ASSIGN command reassigns block devices (disk drives), not character
devices such as COM1.  Use the command MODE COM1=COM2 to make COM1 be COM2.
You can also achieve this effect by copying the word at address 0000:402 to
0000:400.

Craig Chaiken
Hartford Graduate Center
Computing Services
network@mstr.hgc.edu

In article <412@carroll1.UUCP> tkopp@carroll1.UUCP (Tom Kopp) writes:
.In article <9593@dasys1.UUCP> jzitt@dasys1.UUCP (Joe Zitt) asks: 
.>Is there a way to fake out a PC into talking to a different COM port?
.
.The dos assign command should work.  I've seen it used to tell something to
.send to COM1 everything that was supposed to go to lpt: so your mileage may
.vary.
.
.Basically, before you are going to use the modem, enter the following line:
.
.assign com1 = com2
^^^^^^^^^^^^^^^^^^^^
	Gee that's what I thought, however they gone and changed this
	again. According to my Compaq 3.2 manual, they assign command
	is only available for a "specific drive" to a "different drive".
	The Mode command can reassign, but only the printer ports!!

	Looks like they decided that we don't need that feature anymore...
-- 
 my signature file just got squashed......................
email:   cb@cci632     or    !rochester!kodak!n2hkd!curtis  
Curtis Braun, Computronics, PO Box 1002 Fairport NY, 14450  

>
>   Is there a way to fake out a PC into talking to a different COM port?
>

One way would be to use BNUCOM - a Level 5 compatible F.O.S.S.I.L.
driver. It comes with a utility to change BNU's com addresses to
effectively use different ports without changing the program.
(Assuming this program uses a fossil driver)
Hope this helps,
Don
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