Calculator blog
Musings and comments about our common interest
More about the reprogramming cable
Publicado el por JGD
Continuing with the programming cable: I received pictures of some parts as they were being produced by the manufacturer. These are the circuits used for the two buttons in the cable: the Reset and Erase buttons.
Cable for HP15c CE reprogramming
Publicado el por JGD
As you know, we have designed a cable for the newest Voyagers' reprogramming. The calculator side has a POGO 6-pin connector, and the computer side has an USB A connector. (maybe too early for an USB C connector?). We have had several redesigns to improve connectivity, useability and resistance - all which has delayed the delivery until now. We expect to receive the initial units around ...
The HP16c mode
Publicado el por JGD
I am beginning to learn the HP16c through the HP16c mode in the latest HP15c CE. It is very expensive to get an original HP16c!
Unfortunately, the HP16c mode has a very nasty bug whereby the DEC screen mode does not represent well the X register's contents. The register contents are OK - it is the screen view that is wrong. It happens with...
Battery door for new voyagers
Publicado el por JGD
With the new voyagers you don't need to open the battery door for a long time. I am a heavy user of the HP15c Collector's Edition, and I have been using it from April when I received my test unit. It is still runn...
Black Friday 2023
Publicado el por JGD
Now we have the Black Friday campaign at full speed. We have created a specific page with all the offers. you can find it here: Black Friday Offers
Among them you can find what is probably the most interesting item in our website (basically because we are the only ones that can offer it: the HP15c CE "Black Friday Edition", which includes:
- HP...
The best link you can add today to your browser
Publicado el por JGD
I think this is the best link you can add to your browser if you are a HP calculator lover: all the manuals in all the languages that the site owner has been able to get/scan !!
Replacement cover for batteries
Publicado el por JGD
Now that I am frequently opening the calculator to put new firmware types I enjoy having the 3D-printed Voyager battery covers. We have it for the original calculators (the small door for three button batteries) but we also have it for the new models (compati...
Buying 2 HP15c CE?
Publicado el por JGD
Why not? In my case it is easier than in others for obvious reasons. However, lately I had to do several conversions from Hexadecimal to Decimal - and while I can do them in the "Base" menu of the HP Prime, it is actually easier to use the HP16c to add, subtract and calculate.
However, every time I do it I need to reset the memory and progr...
Patching Voyager calculators
Publicado el por JGD
We offer a flashing service for calculators using the POGO connector. These include the HP12c, HP15c and HP10bII+. There are community patches available for the HP15c. This patch solves the DEC bug in the non-manufacturer-supported HP16c mode, from a solution devised by a well-known community member. The second picture shows a calculator without the bug. In a calculator with...
DEC bug solved - testing a patch
Publicado el por JGD
An image is worth 1000 words: as you know, in the NOMAS HP16c this screen was not possible. When you keyed 111, you got 105 !! This was called the "DEC" bug. You could not complain: it was a gift and it was Not manufacturer supported feature. Now "someone" (we don't know if he wants his name mentioned) has created a patch that we are testing. As it only patches a couple of bytes in the HP16c ROM, it should not impact on 15 or 15.2 performance. We've been using it during 15 days with no iss...