[GreenKeys] Question About Model 15 Key Sets

[Duncan Brown]

Bob,

The controlling factor in what is printed in upper case is the 
_printer_, not the keyboard.  All keyboards send the same information. 
When preceded by the "FIGS" key, an upper case character will be 
printed, but it depends on the printer, not the keyboard.

For example, "C" = "01110". If "FIGS" (="11011") is received, followed 
by "01110", either "?", "5/8", or "O" will be printed on a US machine, 
depending on whether it is set up for "Communications", "Finance/Stock", 
or "Weather."

Unfortunately, on the M15 the whole type basket (or at least many of the 
type basket keys) has to be changed to change what is printed in upper 
case. That was one of the improvements made in the M28: the type box 
could be easily & quickly changed for different systems.  European TTYs 
had their own versions of upper case characters also.

See http://rtty.com/CODECARD/codecrd1.htm

You can change the keytops of your keyboard, but it won't affect what 
you are sending. TTY keyboards were always designed to be removable and 
on old units they don't always match the type basket of the printer.

Hope this helps.

have fun,

Duncan
K2OEQ


On 15-May-21 19:23, Bob via GreenKeys wrote:
> Hello All...
>
> I am in the process of restoring 2 Model 15 teletypes. My keyboards 
> and keys have upper case fractions. What keyboard is used in RTTY 
> communication? Which keys do I need to change? What is the easiest way 
> to change  keys on the printer?
> Thanks for your help. Bob...
>
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