The IBM 5100 has the ability to decrypt/translate/convert legacy computer languages.

It wasn't just needed to avert Y2K.

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You all already know the details of the portable displacement device.

I'll give you a simple explanation of time-travel to think about while I'm away.

A picture is a primitive time travel device.
An HD recorder is a more advanced time travel device.

You can record yourself and say 'Hi' to your recorded past self. But your past self can't say 'Hi' back.

This portable device can project my image so intensely that I can say 'Hi' and people from the past can hear me.

Ghosts have this same ability but they mostly project themselves into the future.