The Archimedes was called a "BBC Micro" because it was part of the BBC's home computing initiative, but architecturally, it had nothing to do with the original BBC Micro.
My brother had one. Really cool machine, and as far as I remember, on a completely different level than anything that had existed before it. Soon succeeded by the Risc PC, which I mostly remember for being able to accept various configurations of additional processors (it could get either an x86 as co-processor, or several additional ARMs).
Pictures:
https://chrisacorns.computinghistory.org.uk/Computers/A3000....
Note the logo at top right of the keyboard.
Also note the bright red function keys.
As I wrote in another comment I was pretty close to the fire and had very early access to the ARM architecture based beebs courtesy of a friendly contact but I realized soon enough that the future for home computing and SMB business computing did not lie with either Acorn, Atari, Commodore or any of the other contenders. In '88 or so (my memory is a bit hazy about the dates, there was a lot going on in my life back then) I moved to x86 professionally with a side of Atari ST (using the fantastic Mark Williams C compiler + documentation) for more fun stuff and with the advent of the availability of the internet for the masses I ran SGI Irix for a couple of years until I settled on Linux which has been my daily driver for decades now. Hardware architecture used to be a super important factor for me, now the only thing that matters is whether or not I can run Ubuntu and whether the hardware is sufficiently powerful to get me through my working day. The fact that my daily driver is a 12 year old laptop is a nice indication of how far we've come, it is pretty rare that I put together machines where performance really matters.
But regardless of all of that I have a fond spot in my heart for the BBC, regardless of processor used, it was the machine that allowed me to finally do some more structured programming and explore other languages without breaking the bank.
This is not true. It had lots to do with it.
* The Archimedes used a CPU whose designers (Sophie Wilson and Steve Furber) have specifically said they built it to be conceptually similar to the 6502. Source: I have met both and seen them say this in person.
* The Archimedes ran RISC OS which is a rewrite of the BBC MOS. Source: I have interviewed the project leader, Paul Fellows.
https://www.theregister.com/2022/06/23/how_risc_os_happened/
The Archie came with !6052tube and could run some BBC apps.
Source code: http://bbc.nvg.org/rom/Acorn/os/?C=N;O=A