ycalc
, an X Window Calculator, based on Texas
Instruments TI-59, by Ulf Nordquist. The
development started in 1989.
As you can see in the picture below it provides a binary mode, and that's why I like it.
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Only a slight modification was required to make it compile on Debian. It used to be in the repository but it is no longer.
Download ycalc-1.09.2.tgz