[GreenKeys] TTY-CONNECT loop adapter thingy

[Bill Buzbee]

Henry Minsky writes:

> >
> I use a PC running Linux to drive my teletype; the Linux 
> serial drivers 
> can run the UART with 5 bit chars at odd baud rates.
> To control my system, I modified the "boa" web
> server to also handle the serial port. But I am thinking that 
>  HeavyMetal might port to Linux without too much trouble, 
> seeing as how it uses 
> Perl, which is well supported, even better on Linux
> than on Windows I think.

Actually, HeavyMetal was developed on Linux and then ported to Windows :-).
When it runs on Linux, it uses the old "setserial" utility to set the odd
baud rates.  It works by overwriting one of the fast baud rates with
whatever you want (actually, it allows you to directly set the divisor for
the standard 166500/whatever UART used in pc's).  The Windows versions uses
a hack which tried to reprogram the UART directly (which the more modern
versions of Windows correctly disallow).
...Bill