Someone actually wrote a Traveller variant for the ancient greek/roman era. So, no, it's not of need either disingenuous nor silly. More than one, actually, as I've two on my old computer, and a third on this one.
And the ancient greeks had at least one computing device for certain: The Antikythera Device, a calendar/orrery. certain descriptions of other devices, once thought to be mere legend, now have peopla actually making them with techniques demonstrated to be period appropriate and resulting in a working reimplementation of the quite broken Antikythera Device. Clickspring, on youtube, did a whole series on making it, documenting his techniques and materials. Gorgeous little beast.