logₓy

[rprosperi]

(01-12-2019 10:49 PM)Valentin Albillo Wrote:  I also think that the HP-75 had a general Log to any base, not sure if in the mainframa or perhaps in some ROM or other.

The HP-75/71 mainframes include:

LOG(X) Base e Log of X
LOG10(X) Base 10 Log of X; 71B can also use LGT(X)

The HP-75/71 MATH ROMs include:

LOG2(X) Base 2 Log of X
LOGA(X,N) Base N Log of X (75 Only)

The 71B also includes LOGP1(X) which is the value of Ln(1+x)

So, pretty complete.