[GreenKeys] Heavy Metal

Fri, 4 Jan 2002 14:10:22 -0500

I did this search about 6 months ago and don't remember where I found it.

But.

The wireless LAN manufacturers make a device that you put a wireless
PCMCIA card into and connect the Ethernet jack to your computer.

As I remember, Lucent makes one.  It's probably a little pricey, but
it's intended for the situation where the computer doesn't have a
PCMCIA slot.

Tom KA2VAD

-----Original Message-----
From: Henry Minsky [mailto:[email protected]]
Sent: Friday, January 04, 2002 1:42 PM
To: [email protected]
Subject: Re: [GreenKeys] Heavy Metal

Gil,

Actually, if the embedded systems get a little cheaper, I sometimes imagine
it
would be neat to make a little
embedded box which runs Linux and has a wireless LAN built in, and a TTY
loop power supply and interface. Putting
a teletype on the Internet will be so easy that everyone will want to do it!
No unsightly wires trailing around the house.

I actually compiled my C tty driver/monitor for this embedded board: 
http://www.axis.com/products/dev_board/index.htm (an embedded Linux
board). The board has an ethernet port, and serial ports,  but no easy way 
to attach a wireless ethernet
card. I looked at this other board called CerfBoard , 
http://www.intrinsyc.com/products/referencedesigns/cerfboard.asp, which has
a compact flash slot  and USB port, either of which could take a 802.11 
device, but the boards don't seem to be sold in small quantity for the 
hobby market.

Henry

>If any of you built my TTY232 interface board, I finally programmed a pic
>micro for it to do ascii/baudot and baud-rate conversions.  The chip is NOT
>needed with Heavymetal or RTTYArt (since they talk baudot directly to the
>port), but it lets me connect a 19200-baud port using ascii, to the TTY232
>box.  It buffers the data and implements XON/OFF flow control, so anything
>application that prints an ascii text file to a serial port (at 19.2 w/
>xon/xoff) can just dump and the tty will slowly catch up with nothing lost.
>  It's mostly xon/xoff that does it, since the buffer is just 80 bytes of
>pic ram.  It sends the data to the tty at 60/66/75/100-wpm baudot, or
>110-baud ascii, converting as needed.  It also constantly watches for chars
>from the tty, converts them to ascii, and sends them to the serial port at
>19.2.  Pretty clean actually, and kinda fun to write.  It still needs some
>finishing (like changing baud rate from a command embedded in the text
>stream), but it uses a flash pic uC, and program changes can be downloaded
>from a pc.  If anyone cares, let me know.
>
>I am thinking about adding auto-motor control by triggering a relay when a
>char is received, buffering the chars for a few seconds while the motor
>winds up, and then sending it out.  After a minute or two of inactivity,
>power the unit down.
>
>Other thoughts were to add selective calling headers to select a specific
>tty (could be like HeavyMetal escape stuff (.,.):  .,.01 up to .,.99 for
>example).  Then put a simplified interface pcb into a small box, with a
>lower-voltage loop supply (cheaper, cooler, safer), a motor relay, a little
>pic, and a 232 interface that can be paralleled (tri-state on the return
>line).  One small, not-too-pricey interface at each machine, that powers it
>up when addressed, prints, and shuts it down.  The 232 lines could just
>daisy to as many units as desired.  Even better, it could use cheap RF
>modules -- a wireless teletype local network.  But again, there's not many
>folks who might even care, so it's tough to get too deep into it.
>
>Dooohh, there's too much stuff to do, and not enough hours in the day.
>
>gil
>
>
>
>
>;-----------------------------------------------------------
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