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From: hull@hao.UUCP (Howard Hull)
Newsgroups: net.micro
Subject: Re: Single-chip 1200 baud modem
Message-ID: <1062@hao.UUCP>
Date: Thu, 12-Jul-84 20:56:20 EDT
Article-I.D.: hao.1062
Posted: Thu Jul 12 20:56:20 1984
Date-Received: Sat, 14-Jul-84 00:12:58 EDT
References: <4610@mordor.UUCP>
Organization: High Altitude Obs./NCAR, Boulder CO
Lines: 28

Thank you very much, Steve, but you could've also mentioned the details:
Magazine: Electronics
Issue:    July 12, 1984   (&%$#"! just got mine today).
Article Title: Leased-line and videotex applications
	       are targets of one-chip modem

	       |On chip digital signal processing takes care of many popular
		standards in one shot|
		by
		Stevan Eidson, Advanced Micro Devices, Inc. Sunnyvale, Calif.
Page:     119
Extent:   3 pages
Figures:  Fig 1. "Higher Back-channel Rate." shows Bell 202 5 b/s back channel
                  v.s. 150 b/s back channel for videotex terminals
          Fig 2. "Modem Mode." show how five mode control bits satisfy half/
		  full duplex, 300 and 1200 bps, and other special options.
          Fig 3. "Isolation." shows additional parts that must be used to
		  make up the DAA required by 'Regulatory agencies'
          Fig 4. "Full-duplex." shown implemented with one Am7911, three simple
		  op-amps, and two DAA's. [DAA = Data Access Arrangement]
	  Fig 5. "Videotex terminal." block diagram: keyboard interface,
		  8051 microprocessor, video RAM, Dual-Tone Multi-Frequency
		  Generator, CRT Controller, Video Signal Generator, Buses,
		  Communications Control Unit, 7911 Modem.
Comment: Contains no detailed schematic data, but considerable discussion
	 of technical, developmental, and operational philosophy.
Part type#: Am7911
Mfr: Advanced Micro Devices