I have been using HP calculators since the mid-70's, when my cousin (who worked for Hewlett-Packard in Sweden) brought an HP-21 to us. When I was in 8th grade and we finally were allowed to use calculators during math class, I purchased the HP-15C, a programmable scientific calculator. In 1987, when I was in high school, the HP-28C was released, and I got it as soon as it came out. The next year I upgraded to the improved HP-28S (32kB instead of 2kB and a 1 MHz processor instead of 640 kHz). Both were clamshell designs. I also got a HP 82240B infrared printer, which used thermal paper.
In April 1990 I was getting the HP-48SX as soon as it came out. I could use the same infrared printer I already had, and I also got an expansion memory card (128 kB, I believe). I used this calculator for many years, and still have it, even if it is not working fully, due to a faulty on/off switch (which seems to be a known issue on these old units). My next project will be to open my calculator and fix this problem...
The HP-48SX had a serial port, built-in Kermit file transfer and infrared communications. There was a large set of programs and utilities available on several bulletin board systems (BBS) and later on the Internet. Most notable were Joe Horn's Goodies disks. Many programs can be found at hpcalc.org.
Back in the late 1990's I found some emulators that let me run a HP-48 on my Windows computer. It required a ROM image from the original calculator, which I of course still had. Then in 2000, HP released the ROM images for free downloads. Very cool!
The emulators have evolved, and now everyone can get a HP48SX, or it's successors 48G and 48GX, on their desktop. It is actually very simple. You just need three small downloads to do this:
Simply unpack the Emu48 installer and run it. Put the ROM image in the Emu48 directory and use the convert.exe program to convert the ROM image. Then copy the files for the skin into the same directory. Launch the program, and you have a really cool calculator. Everything works, including programming! More skins, as well as other programs, can be found at hpcalc.org.
HP calculators, with the exception of the business models (designated by a B in the model name) use Reverse Polish Notation (RPN). It is a faster and better way to calculate, especially more complex computations, but can be confusing to non-engineers/technical users. I highly recommend to learn this, though.
So go get this calculator for your computer and start playing!
I am now an IBM Champion!
Thu, Dec 5th 2013 8:32a Karl-Henry Martinsson This morning I received an email that I have been selected as one of 87 IBM Champions from 18 countries around the world. This is the first time I am awarded this honor, and I am humbled to be listed together with some of the greatest names in the ICS/Lotus community (a.k.a. the Yellowsphere).
So what is an IBM Champion? This is how Oliver Heinz (who takes over after Joy Davis as Community Manager) describes it:
These individuals are non-IBMers who evangelize IBM solutions, share their knowledg [read] Keywords: collaboration
Code – Mask text to remove PII
Mon, Dec 2nd 2013 10:10a Karl-Henry Martinsson Sometimes you need to remove personal identifiable information (PII) from the data you present in an application or on a web page. In the last couple of weeks this issue popped up twice, including one application which needs to be be HIPAA compliant. One solution is to mask any personal identifiable data so that the recipient can still verify the information, without sending it all in clear. I am sure you all seen this on for example credit card statements, with only the last 4 digits of your cr [read] Keywords: domino
“Half an operating system: The triumph and tragedy of OS/2″
Tue, Nov 26th 2013 12:47p Karl-Henry Martinsson The other day I found an interesting article at arstechnica about the history of OS/2, the IBM operating system that was supposed to replace MS-DOS. “Half an operating system: The triumph and tragedy of OS/2” brings back a lot of memories for me.
I worked at Microsoft in 1988/89, when the first couple of versions of OS/2 had just arrived on the market. IBM was just down the road, and one day my boss gave me a stack of floppy disks containing the Microsoft-developed OS/2 version 1.1 [read] Keywords: ibm
Book Review: A man called Ove
Mon, Nov 11th 2013 10:20a Karl-Henry Martinsson One of the most talked about books in Sweden in 2012 was “En man som heter Ove” (“A man called Ove”) by Fredrik Backman. Fredrik did the unusual thing to debut with two books at the same time, his other book was called “Saker min son behöver veta om världen” (“Things My Son Needs To Know About Life”). Earlier this month his third book, “Min mormor hälsar och säger förlåt” (no english title yet, translates to roughly “ [read] Keywords:
API for ZIP Code Distance, Radius, and more
Wed, Oct 16th 2013 5:15p Karl-Henry Martinsson The other day I stumbled on a really cool website, where they offer a free API to calculate distance between two US ZIP codes, all ZIP codes in a specific radius from a given ZIP code, as well as a few other ZIP code related functions.
The results can be returned in different formats, like JSON, XML and (in some cases) CSV. Highly recommended! The URL is http://zipcodedistanceapi.redline13.com/
I am considering creating a Lotusscript class for some of the [read] Keywords: lotusscript
Excellent Bootstrap select plugin with great support
Wed, Oct 16th 2013 5:03p Karl-Henry Martinsson For a project I am currently working on, I needed a nicer looking select box (drop down) than what Bootstrap offers out of the box. I did some searches and found a handful of free ones, most of them pretty good but not exactly what I wanted. Some did not handle different themes, other had additional functionality I did not want/need, etc. I probably been looking for a good alternative for 3 weeks by now.
Then the other day I found an inexpensive plugin at CodeCanyon. Custom Select for Twitter [read] Keywords: bug
Bose takes on Sonos
Thu, Oct 10th 2013 11:44p Karl-Henry Martinsson Bose, well known for their noise-cancelling headsets and bluetooth/iPhone speakers in the SoundLink/SoundDock series, today presented a new series of multi-room audio products, which they intend to compete with Sonos Multi-Room Music System.
Today three products were released in time for the holiday season, with more products in the works for next year. I was able to play around with them for a little while, and I have to admit, they sound really good.
SoundTouch 30, Soundtouch 20 and Soun [read] Keywords: iphone
Time to nominate IBM Champions
Tue, Oct 8th 2013 10:02a Karl-Henry Martinsson Kathy Brown recently posted about the nomination of IBM Champions for 2014, and I wanted to spread the word as well.
Anyone can nominate non-IBMers who are sharing their knowledge, evangelize and advocate for IBM Collaboration Solutions (ICS), help grow and nurture the community and provide feedback to IBM (both negative and positive) in a professional manner.
You can learn more at the IBM Champion website, and (more important) you can also nominate someone you feel should be an IBM Champion. [read] Keywords: collaboration
Thu, Oct 3rd 2013 9:42a Karl-Henry Martinsson Today I logged in to IdeaJam (#thanksbruce) and for some reason I decided to look at my own old ideas, something I haven’t done in a while. I noticed this post, from december 2010, almost a year before IBM launced the XWork server in October 2011…
Perhaps IBM listens sometimes, even if they did not make it free, $1000/year is not a bad price for a powerful server like Domino/XWorks. [read] Keywords: domino