HP-25C Eumulator
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10-07-2014, 06:15 PM
Post: #31
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RE: HP-25C Eumulator
(10-07-2014 03:53 PM)Neil Hamilton Wrote: Was in stock when I checked. It's far from me (I am in Canada), and I ordered units for 5 builds, will see when they arrive. (10-07-2014 05:15 PM)Thomas Radtke Wrote: Can't the original modules be reused? Assuming you are talking about the original bar type led module from the real woodstock calculators, yes, but the current PCB was not designed for them. For a brain-transplant, a new PCB need to be designed. If we want to re-use the keys, we will need 1) additional / alternate IC, 2) re-work firmware for different key scanning matrix. With the current firmware, it's a fix and go at the moment (currently I still have issues w/ saving and loading program steps) and the firmware must be tested more before I can assemble kits. I would like to ship 1 unit to a tester before making the 10 or so kits available. Ideally someone who is familiar w/ HP-25C, 33C (programming too) and preferably have some electronics background, may be able to flash firmware updates? (I used a $10 TI Launchpad G2 as programmer). Any taker? The tester will have the unit in my last video (the one w/ 2 batteries). I can tweak the firmware based on a tester's feedback and review. What I really don't want to see is people getting the kit and there are bugs in the firmware and there is no way to re-flash the firmware. Also, If you are thinking to get one, please understand what it is before committing. I had gone thru prototypes, two iterations of custom PCBs and many hours. I am not trying to make money on kits. But would like others to enjoy this project. . The display is not bright, you cannot read the display outdoors, and difficult to read beside a bright window. . It is small (narrower but taller than a credit card) and you cannot press buttons efficiently. . You do not want to use it as "the" calculator you use. . It is fragile. Got no case. OTOH . It is a toy. It is not designed for practical use. It is fun to play with. It is true microcode emulation (thanks Eric). It's a great talk-piece. |
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