Maybe, but not before she designed the Arm instruction set which is what the parent comment says (possibly I'm being pedantic but it does make a mess of the whole chronology).
You're correct, I got the chronology wrong. From a more careful reading of Wikipedia it looks like ~2 yrs writing most of BBC BASIC, then designing the ARM instruction set, whilst at the same time maintaining BASIC (for another 15 years).
Thanks. I feel really bad about my pedantry now! I didn’t know that she’d carried on maintaining BBC Basic for so long after the BBC Micro era.
Funnily enough I downloaded that ARM assembly language book last week in the course of writing up a couple of blog posts on RISC. (Shameless plug: first one on the IBM 801 should be our over the weekend - link in my bio if of interest.)
Thinking about all this made me remember https://archive.org/details/arm-archimedes-assembly-language..., which as I recall was a pretty decent introduction to how microprocessors work (of the RISC variety, anyway).