Memmory retention without battery in pioneers

[Marcio]

(03-29-2016 12:27 PM)Maximilian Hohmann Wrote:  I never understood why they keep adding memory without any means of backing that up somewhere. A micro USB or SD card connector costs only a few cents.

The 33s/35s were designed for surveyors and similar who will take tests where graphing calculators or any other machine with ability to send and receive data are not permitted. That is why there is no USB, blue-tooth or anything like that.

Still, they could have added (put back?) matrix capabilities and several other important features.