ENG display mode on HP-15C

[AnnoyedOne]

From p59 of the HP-15C Owner's Handbook (November 1985, Rev. G)

Quote:Engineering Notation Display

[ENG] (engineering) format displays numbers in an engineering
notation format in a manner similar to [SCI], except:

* In engineering notation, the first significant digit is always
present in the display. The number you key in after [f] [ENG]
specifies the number of additional digits to which you want to
round the display.

* Engineering notation shows all exponents in multiples of
three.

So [ENG] 0 does exactly what the manual says As RPNerd said that may not be what one thinks that it should do.

A1

PS: The HP-15C LE and CE manuals I have say the exact same thing.