>> -- "Wherever you go, there you are." - B. Banzai, Ph.D. Bruce Johnson I havethree modems setting in front of me. A 33.6k SpeakerPhone Fax/ Modem Model A820 which has a wall wart with these ratings, output: One is a Global Village 9V DC 600mA. BTW the input power on the modem isI have in front of me three modems. One is a Global Village TelePort 33.6 Speakerphone Fax/Modem. The power supply output:9V DC 600mA. The PS plug looks somewhat like the ADB plug. The second Modem is a US Robotics Sportster Voice 28.8 V34 and 33.6 Faxmodem and the PS output: 20VAC 10VA. Plug is like most wall wart plugs. Dimensions unknown? The third is a Diamond Supra Express 56k. PS output:DC 6V 500mA. The plug is similar to a audio plug in appearance, but smaller. My conclusion, well, I don't have one. Leave that to you. David in WV.
The GV and probably the Supra are both Mac Specific modems. Their serial ports can operate on a positive power supply only so they can use a DC supply. These are possibly the only two brands like this.
The USR like most if not all machine non-specific need to generate + and - power for their RS-232 interface. This can be done very simply using an AC input.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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