Article 8688 of alt.2600:
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From: otto@no3u.pgh.pa.us
Newsgroups: alt.2600
Subject: Re: FISH on my scope!!!
Date: Mon, 01 Aug 94 11:04:53 PDT
Organization: The Toads
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> The other day at work there was an animated display of fish swimming about
> on my scope. Honest.
> The scope in question is a Tektronix 1755A.
> 
> Anyone know how to turn this screen saver, hack, joke, on and off?
> If so drop me a line. {{:-P  (bad joke smiley)

I'm not sure if this works with the 1755, but on the 1780R try this:

1. Press the "CONFIGURE" button on the left side of the scope.
2. Press the "PAGE" soft-key on the touch screen until page 3 is selected.
3. Press the "VERSION" soft-key on the touch screen. You won't see any apparent 
effect.
4. Press the "Vect/SCH" button on the right side of the scope to see a 
PacMan-like cartoon.
5. Repeat Step 3 and press the "INPUT CHB1/CHB2/CHB3" button on the right side 
to see a Towers of Hanoi cartoon.

Let me know if this works for the 1755. I think someone at Tek had a little too 
much time on their hands!