For which models was 2^3>8?

04042017, 05:03 AM
Post: #1




For which models was 2^3>8?
According to my best attempt to pinpoint the moment when 2^3 began to equal 8 in the evolution of HP calculators, I've compiled the following partial table of model introductions in historical order:
HP35 197207 HP80 197302 HP56 197304 HP66 197304 HP45 197305 HP65 197401 HP70 197408 HP55 197501 HP21 197502 ??? HP25 197508 2^3>8 ======================== HP22 197509 2^3=8 HP91 197603 HP27 197605 HP25C 197607 ??? HP67 197607 HP97 197607 HP10 197707 HP29C 197707 HP92 197707 HP19C 197709 HP97S 197712 Therefore the accuracy improvement seems to have happened between the inaccurate HP25 (introduced August 1975) and the accurate HP22 (introduced one month later). HOWEVER that leaves me with two questions: (1) This implies that the HP21 used the old inaccurate math, but I don't have one to verify that on. Could somebody with a real physical HP21 (no simulators please) please check whether it returns 8.000000002 or exactly 8? Be sure to set DSP 9 of course. (2) This also implies that the HP25C is more accurate than the HP25, which I highly doubt. Could somebody with a real physical HP25C (not 25, and no simulators please) please check whether it returns 8.000000002 or exactly 8? Be sure to set FIX 9 of course. Thanks in advance! <0ɸ0> Joe 

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