"The HP-41C became the first programmable, alphanumeric handheld calculator in 1979. It was also the first flight-critical calculator used by NASA to land the space shuttle, without contacting the ground crew. According [to] the Smithsonian National Air and Space Museum, Sally Ride and several other astronauts used the HP-41C on a total of nine shuttle missions."
The HP-41C is no longer in production but the reborn HP 35s
is our favorite right now. It's the reincarnation of the world's first ever calculator. A true engineer's programmable calculator from the old days.
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