Thread View: alt.msdos.programmer
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Started by DGH103
Tue, 12 Dec 1989 05:15
HELP!!!!!!
Author: DGH103
Date: Tue, 12 Dec 1989 05:15
Date: Tue, 12 Dec 1989 05:15
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1795 bytes
1795 bytes
Ok, I don't think that I explained myself very well the last time I posted this
message. I will try to explain it better this time. I have a Tandy 1400LT and
for some reason they have the modem and the com port attached together,
consequently I cannot use the modem and the mouse at the same time, but that's
not the problem. What I want to do is write a program that I will run when I am
going to use ProComm that will switch from the com port to the modem. I have
the service manual for the 1400 and I am a little lost. I will show how thw pag
e looks:
I/O Address Map
System Status Register
Address Bit Contents Control
(Write Register)
0FCH 2 Modem/RS-232C Switch 1/Modem,0/RS-232C
I guess I should explain that to switch between them now I have to use the
CTRL-ALT-INS key sequence to get to a setup menu then switch to the one I want.
Can anyone help me? Any help would really be appreciated!!
-------
*************************************************************************
* Darryl G. Hickson Penn State University *
* 761 Stratford Drive DGH103@PSUVM.BITNET *
* State College, PA 16801 *
* (814) 867-2234 *
*************************************************************************
Re: HELP!!!!!!
Author: Jim Vickroy
Date: Tue, 12 Dec 1989 19:53
Date: Tue, 12 Dec 1989 19:53
50 lines
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In article <89346.001555DGH103@PSUVM.BITNET> DGH103@PSUVM.BITNET writes:
=>not the problem. What I want to do is write a program that I will run when I am
=>going to use ProComm that will switch from the com port to the modem. I have
=> I/O Address Map
=>System Status Register
=>
=> Address Bit Contents Control
=>
=>(Write Register)
=> 0FCH 2 Modem/RS-232C Switch 1/Modem,0/RS-232C
=>
=>Can anyone help me? Any help would really be appreciated!!
=>
From the "man" page you included above it looks like you need to tweek
port 0FCH to switch to either the modem or the RS232 port. Try this:
;
; Switch to modem
;
IN AL,0FCH
OR AL,02H
OUT 0FCH,AL
;
; Switch to RS232
;
IN AL,0FCH
AND AL,0FDH
OUT 0FCH,AL
Now you'll have to build the rest of the logic around these segments. The
same could easily be done in 'C'.
jim
--
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:::: ::: :: :: : : Jim Vickroy
|OC| ||| || || | | Telecommunications Systems Engineering
|LC| ||| || || | | Online Computer Library Center, Inc.
:::: ::: :: :: : : Dublin, Ohio
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Re: HELP!!!!!!
Author: John Grover
Date: Fri, 15 Dec 1989 19:36
Date: Fri, 15 Dec 1989 19:36
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I think Jim Vickroy is on the right track except the register is write only -- so we need to find a way to read the current status before writing to the register. Otherwise, we don't know what value to write to the register. John Grover University of Maine Computing Center
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