I remember finding some older Adaptec cards for an early Linux box and they were still worth some change, even 5+ years old.
It was cool and fascinating to me that only knew of the newly released USB, serial and parallel ports for external devices.
SCSI is a beautiful example of abstraction and standardization getting is Cool Stuff decades later. While there certainly are edge cases and it's not as 'tidy' as I'm making it out, it's really neat to me that a device like the BlueSCSI[0] can come along and bring a healthy dose of modernity to old platforms.
SCSI is at a sweet spot of general purpose capability and abstraction from the hardware (unlike, say, the Shugart floppy interface, or even ATAPI/IDE) that allows devices to be built to just plug-in and provide significant functionality to legacy platforms.
I know there was a later revision parallel port ZIP drive that wasn't internally SCSI and that might have been lower cost.
It’s amazing how much these problems went away when high speed USB came along.
Computing was insanely expensive back then.
I'm a SCSI fan, but it took a few revs to get it righted.
Aside from the time we lost a terminator for a few days, I never once felt like the scsi system couldn't work, it was just a matter of a really young me and my dad getting it sorted out. IRQ/DMA/ISA fuckery? There were multiple times I can remember getting a shiny new piece of hardware, that took months of begging my parents, and after getting things assembled thinking that "this configuration of devices" might not be possible to make work together.