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This gets more interesting. Looking through SCSI/SAS controller drivers, I've found *6* that use eerily similar register interfaces. I didn't think they were all the same silicon, so what gives? drivers/scsi/ips.h has the clue. Turns out it's from the Intel i960 Rx.
So apparently many/most smart (i.e. with real firmware) SAS/SCSI/RAID controller cards on the market have a design descended from the 1997 vintage Intel i960 Rx I/O microprocessor. This also lets them switch silicon vendors and keep the driver compatible-ish!
Comparison of register definitions for various SCSI drivers in the Linux kernel (plus i960). I guess I2O is alive and well still. I wonder where the identical upper registers (like the 64-bit queue ports) came from though. They're also the same across various hardware.pic.twitter.com/6nSzJQLuzl
I think the i960, and similar CPUs, fulfill a need for a specific type and amount of processing that is needed for RAID cards. The CPU is independent of the design. Look at Apple PowerPCs vs IBM PowerPCs. Same CPU, fairly different architectures.
How many different computers used the venerable Motorola 68k line of CPUs? How similar are they? 
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