[GreenKeys] Machines

[Jim Haynes]

If I tried to run it under DOSBOX it failed.  The program runs under
Windows but doesn't do the right things - it keeps the characters at
8 bits rather than 5 bits.

The nature of the beast is that RTTY12G needs to poke the hardware
registers of the UART, and that is something DOS allows and more
advanced OSes do not.

The intent of RTTY12G is to turn the computer into a "glass Teletype".
It sets the COM port to 5 bits and reads and writes Baudot.  So it was
used in ancient times just to substitute a PC for a Real Teletype.
The reason I continue to use it is that I need a highly-portable
Baudot terminal.  I got a Dell C610 laptop off ebay for $30 plus
shipping (no OS on the disk).  It's good enough to run Linux, but I
don't have a Linux program that does what RTTY12G does, so I just made
floppies and CD ROMs with enough of DOS to run RTTY12G and boot from
one of those.

So far I haven't used it with ITTY or any of that stuff.  I just use it
as a test machine.  Such as for testing my old hardware demodulators
on the work bench where I don't have space for a Real Teletype.  It has
an advantage over a mechanical TTY in that the UART in the computer can
cope with mutilated STOP pulses much better than a mechanical selector
can.

jhhaynes at earthlink dot net