This fantastic Java simulation was written by
Larry Leinweber and donated to the museum.
To work the calculator, press the keys by clicking with the mouse and slide
the switches by dragging.
The calculator should behave exactly like a real
HP-25 except for computational accuracy. (This
simulation computes to about 17 digits and trig functions for very large
angles are always taken as zero.) The calculator is programmable and if you
turn it off, you'll see that it's not an HP-25C.
Because the slanted face legends can be hard to read, if you leave the mouse
over a slide switch or key for one second, a hint will appear in square brackets
on the title bar of the window.