🚀 go-pugleaf

In article <C1Fqsv.FJu@acsu.buffalo.edu> v078p6g8@ubvmsb.cc.buffalo.edu (Richard M Wasserman) writes:
>
>	I was hoping someone out there could point me towards a manufacturer
>and just as importantly a source for a couple of low speed ( 300/1200 ) modems
>in a chip along the lines offered by National.  Single supply (+5) operation
>would be a plus.  Thanks in advance.
>
>		Rich Wasserman

  Someone on the net pointed out Sierra Semiconductor as a good source of
DTMF dialers and decoders earlier.  The very same data book also has a 300/
1200 Bit Per Second Modem listed (it's the SC11016).  Apparently, it doesn't
take much to hook it up.  You will need a controller chip however to inter-
face it to either a parallel bus or a serial cable.  You will also need 
(according to the data book) a 600 ohm line matching resistor, a 7.3728 MHz
crystal and a 20pF capacitor from each leg of the crystal ground.  It's 
a standard  Hayes type modem.  They also sell a 2400/1200/300 bps model
that is virtually the same (I did notice the 2400 bps version can dial the
A,B,C and D keys however (in addition to 0-9,# and *)).  Their phone # is
(408) 263-9300 in the U.S. and in Europe it is (31) 73-408888.  The name
of the book is the _Standard_Products_Data_Book.  Good luck!

						Peter McDermott
						pmcdermo@cs.utexas.edu


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