Ubuntu stty

[Tom Lake]

I'm using Ubuntu 9.10 (32-bit).
I have an ASR-33 Teletype on ttyS0 which can only output uppercase
characters that I'm trying to use as a serial console.  My getty
specifies -U to allow for uppercase terminals.  stty -F/dev/ttyS0 shows
this:

speed 110 baud; line = 0;
lnext = <undef>; min = 1; time = 0;
-brkint -icrnl ixoff iuclc -imaxbel
olcuc
-icanon -iexten -echo xcase

As you can see, iuclc is clearly in effect but
the conversion from uppercase to lowercase isn't being done.
No commands work, and I had to create a user with an uppercase-only
password just to be able to log in at all.
I tried the following to see what I'm getting from the Teletype:

cp /dev/ttyS0 test

When I terminate the command, the file test has all uppercase in it.
Shouldn't stty have converted the uppercase input to lowercase?

If I set iuclc on tty0 (the normal console) it works as expected and
I can turn on Caps Lock and still execute commands and cp tty0 test
does put lowercase characters in test regardless of the state of Caps
Lock.  Is this a bug in stty?  If so, I'd like to get a fix so I can use
my terminals in a local antique computer museum.

Thank you for your time.

Tom Lake