Computer

Computers exist in various shapes and forms in the world of Artograch, albeit not in a shape or form that would recognizeable to Terrans, due to the far more primitive technology, and the presence of magic - not to mention, they are extremely rare.The majority of computes are analog computers (e.g. similar to the Antikythera mechanism), there exist digital computers too.

Light-powered computers
The common type of digital computer in Artograch is a light-powered computer, which is based off light-powered logic gates. The biggest difference between electrical logic gates and light-powered logic gates, is the basic operators of an electrical logic gate would be AND, OR and NOT (with XOR typically being implemented from the combination of the earlier three), while on within the photoh-based or light-powered logic gates, the basic operators are AND, OR and XOR, with NOT being implemented as $$XOR(a,TRUE)$$ (basically, a XOR-gate with a variable input, and a static light input).

One example of such a computer would be the Great Reader in Froturn, built some time around the 3rd century BEKE, supposedly storing the content of books within its memory. The machine was lost when the library it was stored in burned down.

Electrical computers
While electricity as we know it - or rather, mundane methods of generating electricity generation - hasn't been discovered yet by any of the peoples of Artograch, as they're at a medieval level of technology, there have been attempts at building computers that operate on magically generated electricity.

On example of a magic-powered electrical computer was the Shipmelter, built by the Etrandish during the Twelfth Cymbairan War (668-677), but captured by the Gabyrians: it was essentially an automated spellcasting machine that read spells and chants that were encoded in binary, and stored in a clay-based medium similar to punchcards.