Did the HP-65 record data?

[Willy R. Kunz]

When I created RPN-65, the HP-65 simulator for iPhone and iPad, I decided to add the capability to read and write data cards, just like the HP-67 does. In fact, you can easily exchange data cards between RPN-65, RPN-67 and RPN-97.

Alternatively, you can store and load registers along with the program on the same card by simply flipping a switch. This actually eliminates the need for data cards or data-loading programs. Touch-ID-enabled devices even let you protect your register data.

BTW, the "67/97 program with a more accurate approximation where the constants are intended to be stored on a data card" Dieter mentioned above may now be downloaded for RPN-67/97 here. (Scroll down to the Math section.)