history of the 4-level stack

[axd1967]

Quote:Good things are sometimes closer than you expect. The user "jebem" is the one you are looking for (post #4).

OK - finally got it - we are referring to this thread's post #4. Thx.

For the moment, I still believe 4-stack is the result of CPU architecture.

Questions that remain:

1. Why did trig operations impact T in the 35? Why not 'log', for example? (answered, see #16)
2. Why move from 3 to 4 levels - is there another answer than simply the fact that CPU architecture offered 4? (answered, see post #19)
3. (And, slightly OT: was there a particular reason Friden offered 4 levels?)