HP-25C Eumulator
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10-06-2014, 02:05 PM
Post: #28
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RE: HP-25C Eumulator
Good news and bad news.
Good news 1st. I've made good progress on the firmware and have freezed it except for bug fixes. I had created a video to show the features; http://youtu.be/0bu46mYKqck 1. selectable rom from HP-21, HP-25C and HP-33C. 2. press-n-hold + switch on to select one of the three ROMSs. 3. a setup menu to set the default ROM to use, plus ability to set speed (fast / slow). 4. both 25C and 33C programs are stored separately. 5. a greetings message set and show, handy as a gift item. The stability problem I experienced came from the SMD coin cell holder (gnd contact) "touching" two of the button thru-hole contacts. I have to use kapton tape to insulate them properly, re-solder. You can see the backside of the PCB. Now the bad news. I tried to order some of the bubble leds from Sparkfun and found out that they are OOS. So the group-buy / kit is not happening, unless the are back in stock, which I doubt as these are old-new stocks and I don't think HP still makes them. I had previously order two batches of a dozen of so for my projects and I always found there are 2000+ left in their stock, so I am quite surprize that there are 0 now. I scrolled down thru the comments and found that there are one or two person who tried to buy 1000+ units. I guess they got what they want and dry up the stock. I did sign-up for notify when there are new stocks so we will see. |
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