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Calculator blog

Musings and comments about our common interest

 


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some pictures of the units just arrived to Czech Republic

The HP15c first batch of units entered the Moravia warehouse on July 19 - here is how they look! We will ship them to our customers as soon as they reach us!!

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Arrival of units to Europe ( HP15c Collector's Edition )

Forgot to mention that this week the units left the Philippines and are on their way to Moravia in Czech republic. From there, immediately to us and then to you!!!

Also, answering a question to one of our videos in youtube: the firmware date is 2023-01-05

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Difference between leather case and normal case for the HP15c CE

I receive many questions about the leather case for the HP15c CE calculator. 

The first thing to answer is that there you will have the standard case in all cases: choosing the leather case will get you the standard case that is in the box + a leather case.

The second thing is taking a look at the pictures of both:

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The first samples have arrived

...And here is how they look!

(Please also see the HP12c running HP16c firmware !!! )

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Overlays, cover, etc.

We have received several questions about the Overlay option in the HP15CE - so many that we have changed the name to "Cover". 

It is an HP16c overlay to be put on top of the keyboard. It allows the machine to behave as an HP16c if you have the means to transfer there the firmware of an HP16c. It is possible on the newest versions of the HP15c or the HP12c too (NOT Platinum). More details to come in following weeks!

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There will be another option for HP15c cover too.

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More about: hp15c, hp16c
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Still more tests for overlays!

This HP16c overlay version has a little blurred yellow print - the jet seems to be too far from the surface. We'll receive it in a few days to try it mechanically - how it works. It can be used in any new Voyager calculator with the suitable firmware (HP12c -attention, NOT Platinum-, or HP15c CE)

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More about: HP15c CE, hp16c
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More voyager overlay HP16c pictures - tests

Here is another picture fo the tests we are doing with overlays. difficult to get the process to get the colors right! Also the blue labels are still not well centered - next tests tomorrow! At least the keyboard works well and adheres well too: you need to shake hard the calculator to get it out. It will work well on that count!

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More about: HP15c CE, hp16c
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HP16c in other Voyager bodies

 

We are in the final stages of preparing a cover for HP16c. The software will have to work on other "new" Voyager calculators. We have suitable firmware to do it. We are testing it, but I do not think we can run a fully-fledged testing process for it. We will have to work with it as is.

This is a printing sample of what we want to achieve:

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It does not fall from the calculator, and can help you use your voyager calculator as a HP16c - the long-gone computer scientist calculator.

Will it work with the new HP15c Collector's Edition? If we can make it work with the latest HP12c, of course it can!

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A new old HP12c

IMG_0615I cannot help but buy calculators that I like. The other day I spotted a 1987 HP12c calculator in quite good shape. It was still working, but the battery low indicator was blinking all the time. The way the calculator looked, it had not been used too often - so the batteries may have even been original! These calculators' batteries really lasted forever. Also the clicking of the buttons is like the original - clear clicking, but softer keys than the ones of the new HP12c.

But the nice thing of this calculator is that it came with the best leather case.

This time in Burgundy - I had it in the past in brown color, but never in Burgundy!

I still don't know if I'll put it up for sale, or with/without the case, or with my own leather case.

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Repurposing the new HP Voyager calculators ?

 

IMG_0251_en_tamano_medianoThe new HP Voyager (HP12c, HP15c Collector's Edition)calculators have a connector in the battery bay that can be used to change its firmware. Theconnector is that 6-pin set just below the batteries. The previous version had the same connector, and it needed a special cable to do programming with it; however, the previous version had a TTL-level adaptor chip, and is not pin-compatible with the current connector - which runs a USB protocal (albeit with a completely different connector!).

I have tried hard to find the connector to buy or produce such cable, but after looking everywhere for it, I've been unable to get one, or even to order one for production. Now, apparently, there were close to 1000 units of the previous version produced by HP for the 2011 production run. These can be used, but they need to be changed to use the new pin mapping required for the USB connection. I will describe the cable changes in a future blog issue.

there could be another solution, but that involves more effort: you need to open the machine and solder a USB connector in a place designed for it. Only the nano-connector applies!

Why all this fuzz? because using it, you can alter the original firmware to get more memory ! there are instructions of what positions to change in the program memory to increase the memory, and also the palces to tamper to avoid problems with the MEM screen and program limits. You can find them in hpmuseum.org . Be careful with what you do because you can brick the calculator !

PS: if anyone want more precisions, please contact us at jose@thecalculatorstore.com

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