Or: "Stuff I find interesting that doesn't really fit in 'Photos of mundane things' or the logos thread, and that I don't want to see lost in the main thread".
Someone finally did it: A homebrew SCSI-to-IDE adapter for old machines.
It's meant for really, really
old stuff like the 68k Macs (it uses a 53C80 and thus can't do Fast SCSI), but then, I happen to have a Mac Classic with an old 1.2 GB Quantum HDD in it that could use something a bit newer.
And if you look further down the thread, someone did an even smaller version using a PIC32 microcontroller instead of a Z80 (it's meant to use USB mass storage), and a smaller still version that plugs directly into a 50-pin SCSI header (it's meant to use SD).