[GreenKeys] TeleType Model 33 Not Sending Some Control Characters Correctly

[Robert Jarratt]

My Model 33 had been working perfectly. But for some reason it has started
not to send some characters to the computer correctly.

 

For some reason CTRL-C (ASCII 3) is sent as "C" (ASCII 43 in hex). For what
I need it for this is disastrous because it is the character I need to send
to start the login sequence on the simulated computer that I need it to log
in to. I have checked all the CTRL keys, the ones that don't work are
CTRL-C, CTRL-E, CTRL-F, CTRL-I, CTRL-J, CTRL-L, CTRL-O, CTRL-Q,  CTRL-R,
CTRL-T, CTRL-W, CTRL-X, in each case hex 40 is added (ie bit 7 is set). It
does not even seem to be a parity issue because contiguous characters are
sent incorrectly.

 

Ordinary letters are sent correctly.

 

Any ideas where to start looking?

 

Regards

 

Rob

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