You’ll never see a shorter wait loop than this one. Continue reading HP-21 Wait Loop
Category Archives: hp21
Woodstock Microcode
Woodstock was the name HP gave to its newer model processor for its newer model calculators at the time of the HP-67, HP-21, HP-25/C and HP-29. Here’s what was in it: Continue reading Woodstock Microcode
HP21 Emulator with 12 Digit Display
It’s updated! I’ve finally fitted the 12 digit display into the HP21 emulator.
It has also had a bit of a tidy up internally and it has some of the new features from the other emulators. You can copy and paste from and to the X register, and you can see what is in the stack (and memory) at any time.
The product page is here. I think you’ll like the improvements.
HP21 Emulator Released
Well, actually, it has been released for some time now; but I’m planning on getting a few articles up and I want the order right. According to the server timestamps, it has been up since 13 March 2012.
The emulator looks like:
You can click the display to call up some additional options. The most important of these is “Help”.
You can find out more about the calculator and the latest range of emulators on the HP-21 topic page.
Is there help for using the calculator
Yep. There sure is; but it is far too subtle for anyone to notice (sorry).
If you click/tap the display, a menu will pop up. This includes an option to display help. If you click/tap that option, help will open in a new tab of your browser.
HP21 Calculator
I never had a HP21; but a friend did – and I sure used it a lot.
It was the first Hewlett Packard calculator I’d ever seen. It introduced me to the marvels of Reverse Polish Notation (RPN) and it is what set me on the path of owning my own HP calculators.
You can: try it, download it or install it (as a html5 app).
