macdonald@author.dec.com (At long last ...) (09/22/86)
I have a problem. Perhaps someone out there has a solution? I am using an Amiga with a Sony 1311 Monitor, a DEC DF224 "Scholar" modem, and the Online! V1.27 telecommunications software. When everything is hooked up and running, there is a loud tone in the speaker of the Sony which increases and decreases with changes in the volume control. It appears to be an audio signal fed directly into the monitor through the serial port somehow. When I remove power from the modem, the sound disappears. o Is it a modem problem? o Is it a cable problem with the serial port? o Is it an OnLine! software problem? Of course, turning the volume down provides a cosmetic solution, but also causes loss of the bell. Any ideas from netland? Thanks. Paul MacDonald
cmcmanis@sun.uucp (Chuck McManis) (09/23/86)
Paul MacDonald at decwrl writes : > I have a problem. Perhaps someone out there has a solution? > > I am using an Amiga with a Sony 1311 Monitor, a DEC DF224 "Scholar" > modem, and the Online! V1.27 telecommunications software. When everything > is hooked up and running, there is a loud tone in the speaker of the > Sony which increases and decreases with changes in the volume control. > It appears to be an audio signal fed directly into the monitor through > the serial port somehow. When I remove power from the modem, the sound > disappears. > This is exactly what is happening, if you look at the serial connector description in your Amiga manual (the one that has the Amiga Basic manual in it too) you will note several odd signals on the serial connector, not the least of which are "Audio In", "+5V", and I believe + and - 12V. Check what your modem thinks these lines are supposed to be. If possible replace your modem cable with one that only connects lines 1-7 and 20. That will avoid damaging both your modem and possibly your Amiga. -- --Chuck McManis uucp: {anywhere}!sun!cmcmanis BIX: cmcmanis ARPAnet: cmcmanis@sun.com These opinions are my own and no one elses, but you knew that didn't you.
grr@cbmvax.cbm.UUCP (George Robbins) (09/23/86)
In article <5469@decwrl.DEC.COM> macdonald@author.dec.com (At long last ...) writes: >I have a problem. Perhaps someone out there has a solution? > >I am using an Amiga with a Sony 1311 Monitor, a DEC DF224 "Scholar" >modem, and the Online! V1.27 telecommunications software. When everything >is hooked up and running, there is a loud tone in the speaker of the >Sony which increases and decreases with changes in the volume control. >It appears to be an audio signal fed directly into the monitor through >the serial port somehow. When I remove power from the modem, the sound >disappears. 10 to 1 you've got a ribbon cable or 25 wire cable between your Amiga and modem, huh? Pins 15 and 16 of the RS232 connector have the Audio-In and Audio-Out signals for use in voice/modem/answering machine thingies. If some signal is connected to these, or the wires parallel other wires, you can pick up unpleasant amounts of noise at your speaker. In general your cable should connect no more than pins 1-8 and 20, unless you have some specific purpose in mind... -- George Robbins - now working for, uucp: {ihnp4|seismo|caip}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@seismo.css.GOV Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)