HP Forum Archive 20

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OpenRPN: How about a desktop HP-42S? Message #1 Posted by Dan W on 20 Sept 2011, 12:34 a.m. A problem with the OpenRPN calculator is more of a hardware problem than a software problem. But I'm looking at my HP-97 and thinking, with a desktop calculator, size isn't a problem, neither is power really. Find a case, 37 switches (or more!) and a large dot-matrix LCD screen. I'm sure there is probably some DIY thermal printer we could interface with too (if not, it isn't a big deal if we can interface with a PC). Add a USB or perhaps an SD slot, use code derived from Free42S, an Atmel or PIC based motherboard, and we're in business. Just thinking out loud here. A desktop size model might reduce a lot of complexity, making it easier to get our feet wet.

Re: OpenRPN: How about a desktop HP-42S? Message #2 Posted by DaveJ on 20 Sept 2011, 1:00 a.m., in response to message #1 by Dan W Complexity of a desktop is not that much less than a handheld. The main difference being that the keypad would be easier with off the shelf keyboard PCB mount switches. But key legend problems still remain. If you want a desktop, then great, go for it. But if it's just to "get your feet wet" then I don't see any advantage in it. Most of the construction/production techniques are fairly different between the two. Dave.

Re: OpenRPN: How about a desktop HP-42S? Message #3 Posted by Walter B on 20 Sept 2011, 1:38 a.m., in response to message #1 by Dan W IMHO, the market for this desktop is even smaller than for the pocket edition. YMMV

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