I'm looking for the title of a book (part of a trilogy, I'm almost 100%) where a powerful demon makes a "computer" out of lesser demons where:
- thousands of demons that had their tongue in/out for binary data
- "firefly" demons in a grid to create a monochromatic "screen"
... in the books, they never refer to it as a "computer", after all it's a fantasy novel with magic where aside from maybe alchemy, there was no modern/electrical technology. But it was essentially a "Minecraft redstone" computer before Minecraft existed.
I believe the protagonist's strength was that he was not "great" at any specific discipline, but instead he was "good" at almost everything. (And I think he eventually mastered all the disciplines? One might have been Alchemy, and another maybe Sorcery?)
The era in which I read the book could be anywhere from probably 1986 through maybe 1996?