On: Pentium on a 386 Motherboard

[the_snooze]

I prefer the joke explanation. Each new processor line got its name by doing the calculation of incrementing the previous one by 100:

286 --> 386 --> 486 --> 585

[InvaderFizz → the_snooze]

For those that weren't around for the release of the original Pentium CPUs, this off-by-one error is a callback to the bug[0] in the FPU. Hilarious.

0: https://en.m.wikipedia.org/wiki/Pentium_FDIV_bug