Stty bug?

[Tom]

I'm using Ubuntu 9.10 (32-bit).
I'm trying to use an ASR-33 Teletype (uppercase only)
on ttyS0.  I have -U specified in getty for uppercase conversions and

stty -F/dev/ttyS0 

shows this:

speed 110 baud; line = 0;
-brkint ixoff iuclc -imaxbel
olcuc
-iexten xcase

As you can see, iuclc is set but no commands work
and

cp /dev/ttyS0 testfile

put uppercase characters into the testfile.

If I set iuclc on tty1 (normal console) it works as expected, I can
execute commands regardless of the state of Caps Lock and cp tty1 test
puts lowercase letters in testfile even with Caps Lock on.

I'd like to be able to use these old terminals for an interactive
display at a local computer museum so any help you could give would be
appreciated.

Thank you for your time.

Tom Lake