The original script was called "Syntax Era" which is still a much funnier name :)
I remember, despite being a BBC user mostly, Back in '87 I got told off by my parents for swearing in disbelief at this thing that turned up at the Beebug shop.
At the time it was faster than a lot of the minicomputers out there.
Also good to note that RISC OS had these context-sensitive menus before the Mac or Windows did.
The other nice thing about the RISC OS menus was that the 'Save As' option (whatever it was called) would pop out a submenu which had an icon of the file in it - you would then drag that icon to wherever you wanted to save it. That struck me as a lovely implementation of the "spatial file manager" idea, and immediately raised the possibility of having other kinds of terminal menus that would do special things.
The icon above "TextFile" would be dragged to a file window. The only file window shows the ROM applications, so it's actually read-only and there's nowhere useful to drag this icon.
Clicking !Alarm etc with the left mouse button selects one at a time, right clicking extends the selection. There are few other things to usefully right click on. The scroll arrows / bar scroll in the opposite direction with a right click. Selecting a menu option from the pop-up menu with a right click keeps the menu open.
The other really nice thing was the anti-aliasing, which was wonderful.
But one thing to keep in mind, the fast boot up, super responsiveness and anti-aliased fonts are not because you're running a 90s operating system on 201X tech, it actually ran that nicely back in the day too.
I often wonder what computing today would look like if different operating systems had gained dominance.
ARM originally meant Acorn RISC Machine.
Their impact cannot be overstated.
As I understand it, the Electron was a bit of a commercial failure. However this caused remaining stock to be dumped (at least in the Netherlands) at rock bottom prices. My primary school teacher was a big fan of them, and installed a couple of them at our primary school. I got to borrow one for a summer break (1990?). My first forays into Basic programming, as well as trying to understand German, since that was the language in which the accompanying Basic manual was written.
Weird to think how many billions of ARM chips there are now. Another 40 million made every day apparently.
The jump delay slots, I think, are something they share with MIPS, but I'm not aware of anything else.
By the time my beeb reached its end of life it had a Torch Z80 co-processor running a clone/lookalike of CP/M-80 (I picked up some dBase II/dBase III work along the way), a pair of high density floppies and loads of other stuff installed. It outgrew even the aftermarket cases and ended up living in a 19" half height Data General mini computer rack (I was very fortunate to work spare hours with a local Data General broker - I even ended up with a full Eclipse S/130 based mini living in my parents house :) ).
For many young people of that time it was a hugely influential machine.
RISC OS can run on any Raspberry Pi very easily, or emulators like Arcem.