I had similar situation: My son had to prepare some presentation and he chose mainframes as the topic.
I delivered some pictures (BTW:I spent almost 1 hour to find in Internet good picture of punched card, and next half when searching for BIG photo of z/990 !!!), some "funny" facts - like "mainframe is bigger than fridge ...and there is refrigerator inside!", or "in the past mainframe had 64kB of RAM. Yes, it's 1000 times less than the oldest PC in your class." Another : "mainframes are veeeery expensive, entry level solutions is over 1M$, and believe me: no game will run on it".
Since there is a version of Star Trek on either the CBT tape or the MVT mods tape and a game actually became a production program in one shop as a means of getting sales people comfortable with the computer, I don't believe you. Granted these were for a standard 3277 or 3278 so the graphics weren't wonderful but there were games.
Last but not least: I gave him some requsites: the card, the tape, and Bus&Tag cable (half meter with the plug). The last thing wasn't good idea: boys used them as a club (weapon) and were fighting.
Software is safer. <g>
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