SR-50/51 vs RPN

[Stevetuc]

(06-07-2021 07:15 PM)Matt Agajanian Wrote:  Hi all.

While HP has maintained RPN, it seems to me that the Sum of Product logic in the SR-50/51 would be more cumbersome in comparison.

With the way the Sum of Products hierarchy system plays out and with the absence of parentheses, I would think that the 50/51 would require a good chunk of equation rearrangement and intermediate storage register use which would make RPN a more usable and efficient entry system.

Any thoughts?

I had an SR50 back in the day and it requires use of memory for product of sums and is more complex than rpn. There are some examples of this in the manual http://www.datamath.net/Manuals/SR-50_US.pdf