TI SR-50/51 AOS Possible?

[Gene]

Well, one minor clarification (IMO) :-)

The implementation of AOS was likely ongoing, but the ** idea ** of AOS was to evaluate entered expressions using (fairly) standard hierarchy.

The SR-50/51 implemented the sum of products (M/D before A/S), which was a big improvement for algebraic models at the time, but it was the rather large AOS stack of the SR-52 and its descendants that allowed AOS to evaluate more than simple sum of products.

Now keeping track of what was stored in that AOS stack was not simple at all...but that's a different story and a big reason I much prefer an RPN stack of some sort.