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Dieter · (This post was last modified: 01-16-2014 09:58 PM by Dieter.)

(01-16-2014 01:26 PM)Neil Hamilton Wrote: My HP25 does not follow this.
...
So 12.345678 EEX 6 followed by f ENG 2 would display "12.346 06". Whereas f SCI 2 shows "1.23 07".

That's interesting. So the HP25 actually behaved differently? I do not have one at hand so I cannot try this myself.

(01-16-2014 01:26 PM)Neil Hamilton Wrote: [HP25 and 11C]
I don't (currently) own anything in between but the change in ENG behaviour obviously happen in the intervening models.

The HP25 was introduced in 1975, followed by the HP67/97 with the usual n+1 behaviour in the next year. So if there was a change it must have happened within this short period, 1975/76.

Addendum:
I just checked the HP journal article from November 1975 where the new HP25 is mentioned. At the end of page 5 it says:

Quote:... Setting the HP-25 to engineering notation gives the answer as 50.0 -06 which is easy to read instantly as 50 microseconds. (...) If the answer above is multiplied by 10, it gives 500. -06 or 50 microseconds. Multiplying again by 10 gives 5.00 -03 or five milliseconds.

This would mean that the HP25 did not behave differently in ENG mode, and it displayed the result like most other HPs.

?!?

Dieter