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- Newsgroups: comp.sys.3b1
- Path: sparky!uunet!cs.utexas.edu!uwm.edu!linac!att!att!cbnewsi!adh
- From: adh@cbnewsi.cb.att.com (andrew.d.hay)
- Subject: Re: netfax (was: Re: 3b1 internal modem-flow control)
- Organization: AT&T
- Distribution: na
- Date: Wed, 26 Aug 1992 11:19:07 GMT
- Message-ID: <1992Aug26.111907.12@cbnewsi.cb.att.com>
- References: <BtHxo5.JEq@hico2.westmark.com> <1992Aug25.145627.13400@oswego.Oswego.EDU> <1992Aug25.213609.7371@ceilidh.beartrack.com>
- Lines: 29
-
- In article <1992Aug25.213609.7371@ceilidh.beartrack.com> dnichols@ceilidh.beartrack.com (Don Nichols (DoN.)) writes:
- "In article <1992Aug25.145627.13400@oswego.Oswego.EDU> ostroff@oswego.Oswego.EDU (Boyd Ostroff) writes:
- []
- ">I have a Mac connected to my 3B1 through the serial port, and the
- ">Supra v.32bis FaxModem also hooked up to a 3B1 port. I was going to write
- ">a simple program that would open both ports for r/w so the Mac would
- ">"think" it was just talking directly to the modem. Do you think that would
- ">let the Mac fax software work with the modem?
- []
- " If you want to make it automatic, but not load down the 3b1 to this
- "extent, or need the speed that would crash the 3b1, then you might set up a
- "T-bar relay under program control to switch which machine gets the modem at
- "a given time. (The T-bar relay can switch 24 circuits at once in not too
- "big a space.) Since you have 25 pins on your RS-232 connector, you may be
- "wondering which pins not to switch. Of course, you don't need all the pins
- "anyway, but I would absolutely *NOT* switch pin 1. That is the safety
- "ground, and should be tied together in all machines in the interests of
- "preventing zaps to drivers when you switch.
-
- you could also use a printer-sharer switch. these automatically
- grant access based on signals asserted (dcd? dtr?) when hosts try to
- connect to the printer port. if one host has the port open, other
- hosts will fail or sleep on attempts to open the port.
-
- --
- +--------------------------------------------------------------+
- Andrew Hay "Do not fraternize with that creature, I am trying to train him"
- a_d_hay@att.com "But that's a parrot!" "I was TALKING to the parrot..."
- +--------------------------------------------------------------+
-