I'd be happy with "Quadra" to mean "040"
The Four Types of 68k Mac:
- Macintosh
- Macintosh II
- Macintosh III
- Macintosh IV
Worked for Apple later with the G3/G4/G5 biz, which was a little more consistent.
I feel like product rationalization in the G3 era is a fairly significant amount of what saved Apple. There's no single hard reason for every single 040 Mac not to have been called Quadra [number] (Or Mac IV with modifiers) except that Apple tried really hard in the early-mid '90s to separate things into segment-targeted Brands(TM) (Quadra, LC, Centris, Performa) and, across the entire desktop Mac line, none of it ever ended up being consistent.
For example, as we've found out, there are:
- Quadras with LC040s and no Ethernet
- Centrises with Full 040s and Ethernet
- Performas with full 040s
- LCs with full 040s
And so on.
Architecturally, the 630 and 605 come directly out of the LC family. Performa is just a badge that got applied to what was mostly, architecturally and feature-wise, LC-series computers for the purpose of selling them to homes. (And Classics and the IIvx, except for the IIvi/vx was
also architecturally more similar to an LC II than a Mac II, probably for the purpose of making it cheaply.
Incidentally, I have
utterly no idea why the Quadra 605 exists as a discrete product with its own unique case separate from the LC475, to which it is
literally identical internally. I don't
think "LC" as a name had any stigma associated with it in the way Performa did. It makes sense for them to badge engineer it for the different markets (edu vs. normal mac channel retail) (I mean, tbh that doesn't even make sense, but it's what Apple was commonly doing at the time) but it doesn't strictly speaking make any sense that they gave it its own case.
It's cute and aesthetically I'm glad it does, but.