The TI-83 series of calculators not only uses decimal floating-point, but the format is documented: http://merthsoft.com/linkguide/ti83+/vars.html http://merth

The TI-83 series of calculators not only uses decimal floating-point, but the format is documented: http://merthsoft.com/linkguide/ti83+/vars.html http://merthsoft.com/linkguide/ti83+/vars.html In practice, the cost is not that much different because four-function calculators do not do many calculations at once. Even in a graphing calculator, drawing a plot is never slow enough to make the device useless.