[GreenKeys] TTY emulator for iPad

[Ralph Mowery]

If you intend to make it compatible with the mechanical machines here are a
few things to think about.

Number one is to limit the line length to no more than 72 characters.  When
I wrote a computer program many years ago I set it to count the characters
and after 65 characters to look for a word space and then do an automatic
carriage return, line feed and letters function.  If not, do that after 72
characters.  

Remember the older machines need a carriage return and line feed and one or
two non printing characters to get the carriage back to the left.
Being mostly for ham radio it was usually set to do CR CR LF LTRS.  This was
so that if the first CR was missed you got a 2nd chance.

One of the most common things is to send an upper case J and S as many
machines used those as a ' and bell.  Seems half machines were one way and
the other half were the other .  

I am sure that I am missing a few things, so have fun  writing the program.

Ralph ku4pt





-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Dave Horsfall
Sent: Friday, November 06, 2020 4:22 PM
To: Greenkeys
Subject: [GreenKeys] TTY emulator for iPad

I'm thinking of writing a TTY emulator for my iPad (and it's probably 
already been done), but what things should I consider?  I know about USOS, 
auto LF after CR, suppress multiple LFs (all optional in a stunt box), 
different alphabets (inc. WX) etc, but what have I forgotten?

I'll probably never finish it, but it ought to be fun.

Thanks.

-- Dave VK2KFU