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The X-Philes (2nd Revision)
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The X-Philes Number 1 (1995).iso
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modem
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1995-03-31
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From helens!shelby!rutgers!usc!jarthur!nntp-server.caltech.edu!piglet!madler Mon May 14 12:36:43 PDT 1990
Status: RO
Article 1620 of comp.sys.handhelds:
Path: helens!shelby!rutgers!usc!jarthur!nntp-server.caltech.edu!piglet!madler
>From: madler@piglet.caltech.edu (Mark Adler)
Newsgroups: comp.sys.handhelds
Subject: Re: HP48SX Modeming
Message-ID: <1990May14.180107.10606@laguna.ccsf.caltech.edu>
Date: 14 May 90 18:01:07 GMT
References: <900514092448.028@mv2.UCalgary.CA>
Sender: news@laguna.ccsf.caltech.edu
Distribution: inet
Organization: California Institute of Technology, Pasadena
Lines: 18
In general, one can keep a modem well-fed and happy by connecting
pin 6 (data set ready) to pins 4 (ready to send) and 20 (data terminal
ready). When the modem is on, it should assert DSR, but it may wait
for RTS or DTR to be asserted before doing anything else.
Upon satisfying pins 4 and 20, connecting pins 2, 3, and 7 to the
calculator will suffice to use the modem. To avoid (or create)
confusion, I will letter the pins on the calculator as A, B, C, and D,
starting with the pin closest to the IR led/detector pair. Then
connect A to 7, B to 3, and C to 2 (and if you want, connect D to
the cable shield, if any). The pin 2 and 3 connections are opposite
what you would use to connect to a computer, since computer serial
ports are wired like terminals ("data terminals"), not modems ("data
sets").
Mark Adler
madler@tybalt.caltech.edu