Which HP calculator had "The New Accuracy" first?

[Nihotte(lma)]

(06-22-2020 09:51 AM)EdS2 Wrote:  I'm just a little worried by a test case that involves small integers like this. Another example given by Kahan as an accuracy test is this:
729^33.5 / 3^201 -1

It would be interesting to me to see this calculation done on an HP-22, or HP-91, or both, or any other in Joe's timeline of accuracy.

Here are my results:
HP-15C LE: zero
HP-25: -9.99E-08 (same as HP-35 with V4 ROM)

Hi,

I've tested on my HP10bII+, too

pi * e - e * pi
--> gives 0 [ in Algebric mode with Л x e^1 - e^1 x Л = ]
729^33.5 / 3^201 -1
--> gives 0 [ with 729^33.5 ÷ ( 3^201 ) - 1 = ]

But, LN 729 x 33.5 ÷ ( LN 3 x 201 ) - 1 = gives -5E-12 (and curiously 1,00000000 in DISP . mode before applying - 1 = )