Most common calculators in the forum?

[EdS2]

(off-topic digression)

(12-31-2017 12:54 PM)Accutron Wrote:  I came across a Sperry-Remingdon 663 at a thrift store just a couple weeks ago. It's virtually identical to the 661-D, but moves the power switch from the front face to the side.

Oh, that's a major upgrade - the decimal point actually floats! What you (and I) took to be a front-mounted power switch is actually a selector between 0 and 2 decimal digits displayed after the point. The 661 is fixed point, the 663 is floating point.