[GreenKeys] A portable Baudot terminal

[Lester Veenstra]

Or if you do not need to drive the receive device at full speed, run 45.5
baud 8 bit with bits 6,7, and 8 set high; in other words, a long stop "bit"


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jim Haynes
Sent: Thursday, January 24, 2013 5:30 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] A portable Baudot terminal

Sometimes I've wished for a portable Baudot terminal to use in testing TTY
gear.

I have an old Dell C610 laptop and those are dirt cheap on ebay, and have a
COM port.  There are some old DOS programs that make a PC into a "glass TTY"
and are still available.  One I have used is called rtty12g - you can google
for it.

Now the trouble is that the laptop has Windows XP, and while rtty12g will
run under Windows XP it doesn't do the right thing.  Specifically it doesn't
set the UART to 5 bit characters; it sets the baud rate correctly but sends
8 bit characters.  I guess in DOS the program can poke the UART registers
directly to get the desired properties.

So one solution would be if someone knows how to set the UART to 5 bits in
Windows XP and later.

A rather grubby way I have working now is that I have a floppy drive on the
laptop.  I formatted a floppy on a Win98 machine, then copied the rtty12g
files to it, and boot from the floppy.  This works, but I wouldn't suggest
to anybody to go through that process.

Another possibility is to create a partition on the hard drive in the laptop
and install FreeDOS and rtty12g.  Right now I don't know enough about how to
install just enough of FreeDOS and make it bootable along with the other
stuff on the laptop (WinXP and Linux).  I'm assuming FreeDOS would let the
program do what it wants to do to the hardware registers.

Jim W6JVE

jhhaynes at earthlink dot net
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