Woodstock Low Power

[hewlpac]

Bernhard,

Thanks so much for the extra effort to get this project finished!! We all will benefit from the revived calculators and upgraded features. Can’t wait to get started using the HP-27. Will post a group picture of my HP-27 family when I get a chance .

Dave

(12-03-2017 05:27 PM)PANAMATIK Wrote:  Woodstock Low Power hardware finally is available!

I made the LP hardware available on my website and released a new manual. I will send the first circuits to Jim Johnson, who made a presentation at the HHC2017, and David Johnson, who gave me his HP-27 for testing the LP circuit. Thanks a lot to both of you. And to all of you, who were waiting for very long time. But finally it is finished and can be ordered now.

It was much more difficult than the new ACT to get everything running, because it is a multi calculator firmware and has more hardware components playing together. I admit, that I again squeezed as many features into the circuit as possible and now there is not much space left, but everything, which was planned to fit in, could fit in. And even some more. There is even a hidden feature, which is not described in the manual, which you can find. And I had a sequence of adventures with it. The most severe adventure was that the first hardware was not usable at all and the hunt for and late discovery of a very serious compiler error, which made me nearly crazy (or really crazy, I don't know and can't decide it by myself) until I could track down the cause. Obviously my code was more difficult to compile than others and Microchip will update its compiler now. The source code will be free and published in a few weeks, when I have got some feedback and could remove bugs.

Although I could need a break now, I will process all orders as soon as possible and hopefully give you a really nice new LED calculator for christmas.

Thanks
Bernhard