Welcome to Cemetech! Since 1999, Cemetech (pronounced KE'me'tek) has been developing software and hardware in many technology-related fields. Among Cemetech's specialties are TI graphing calculators such as the TI-83+/SE and TI-84+/SE, the Casio Prizm graphing calculator, web programming, and DIY hardware projects and modifications. Kerm Martian, né Christopher Mitchell, has since 2004 held the title of the world's most prolific graphing calculator programmer, with over 400 completed programs and more than 900,000 direct downloads. He has also developed many software and hardware projects. As an active webmaster and developer, you can often find him idling here in Cemetech's SAX chatroom. Numbers: 566 articles have been posted in Cemetech's News Archives. View current site statistics. Within the last seven days, 2 files have been added to the file archives. Click to show the new files. Switch To / Download Program Name & Description Picraft.zip Picraft v1.2.1 alpha Picraft is a Terria-like game for the Ti-84 calculator, and is my first EVER program so don't expect too much. I have been working on Picraft for a couple of months now so please don't steal! If you would like to help with the development of the game email me using the email in the readme. You will receive credit for whatever you do so feel free to help. Made by: Piguy-3.14 Btw the main program is the one called A0000000 ENJOY!!! splash84c.zip Splash84C A short demo program that simply copies a small splash screen to the LCD.	Latest Forum Posts » anyone familiar with programming the Nspire iPad app? by Thunderbird336 » Antelope (formerly OPIA) - A Polymorphic z80 language by KermMartian » Caleb's Oaken TI-83+ by KermMartian » Resources by KermMartian Cemetech Labs Updates » Google Earth -> LDraw/Minecraft ("Voxel" Decomp on 3/14/2013 » How Do I Connect My Calculator to the Internet? on 2/16/2013 » Building a PC-Free Calculator-Internet Bridge on 1/9/2013 » Building a TI-82 Plus on 10/29/2012
Highlights

Published by KermMartian on May 9, 2013 at 1:14:49 PM CST | Discuss this article (46)

Early this week, I had the pleasure of speaking at length with GT Springer, the Education Solutions Architect for HP's calculator division. We discussed the upcoming HP Prime graphing calculator, and I was interested to learn about quite a few unique features of the new calculator. We touched on the programmability of the device, the pedagogy of the pre-loaded applications, the intriguing graphing tools it includes, and much more. I will soon have a full set of technical specifications and some screenshots of the graphing application in action, but for now, read on for the full interview summary.

Mr. Springer and I discussed:

• An initial overview of the HP Prime calculator.
• The particularly intriguing new Apps for the Prime.
• The multitouch touchscreen, student testing, and the future of touchscreen devices like the HP-Prime on standardized tests
• The connectivity, programming, and sensor options for the Prime.
• The calculator's target audience.
• The availability of RPN and 3D graphing on the HP Prime, and the origins of the device's name.

Read the full interview about the HP Prime calculator here

We appreciate HP being forthcoming with these details. Cemetech will soon be getting you screenshots of that new graphing application in action, a full set of technical specifications, and eventually, a hands-on review of the device.


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Published by KermMartian on April 27, 2013 at 1:01:20 AM CST | Discuss this article (8)

Back in November, shortly after we revealed the existence of the TI-84 Plus C Silver Edition graphing calculator (which we have now reviewed and used thoroughly), we discovered that Casio was also unveiling a new calculator. Our article mentioned features like a large color touchscreen, portrait and vertical orientation options, and plenty of RAM and Flash for files and programs. It appeared to have software based on the CAS in the Casio Classpad 330 from the available screenshots. I am pleased to reveal that we have acquired more information about the device.

Speaking on condition of anonymity,sources discussed their initial experiences using a pre-production model of the calculator with us. As the device is still in development, they stressed that it will likely change substantially before hitting retail stores. Our sources particularly praised the screen, calling it crisp and colorful, and complimenting the accuracy and responsiveness of the touch. They felt that the calculator as a whole felt sleek and modern, and from the available photos of the new device compared with the Classpad 330, this editor is inclined to agree. On the negative side, the current pre-production model lacks a 3D graphing application, and at this point, it offers similar mathematical features to the Classpad 330. Finally, the US is likely not the core market for this device, as CAS calculators are far more widely used in (for example) Europe and Australia.

We look forward to learning more about the Casio fx-CP400 as it gets closer to production, and I look forward to eventually getting a hands-on look at it. With the evolution of this device and rumored touchscreen devices from HP and possibly even TI, we may be at the cusp of a more rapid convergence of calculators towards looking and feeling like educationally-oriented smartphones with more elaborate keyboards.

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Published by KermMartian on April 24, 2013 at 2:22:35 AM CST | Discuss this article (27)

Members' projects are the lifeblood of a community like Cemetech. It generates buzz and brings in plenty of new one-time visitors when TI, Casio, or HP release a new product or piece of software, but for all the months and years in between, our members' projects sustain site activity and interest. Sure, we teach people programming for calculators and computers, but users are much more passionate about their own projects than answering questions, in the end. And in a community where the majority of members are motivated, intelligent, and creative, there are bound to be far more project ideas than hours in the day. I for one have a list of potential projects that grows by the month, and an uncomfortably long list of unfinished projects. While considering cancelling one ongoing project and taking up another, I collected a few thoughts I wanted to share on general skills for choosing your projects wisely, something I fear is sometimes ignored in the calculator-programming community.

One of the biggest problems I've noticed over my twelve or fourteen years as active member in the community is programmers picking projects that are either beyond their abilities or too large to keep them engaged. My experiences with users starting projects poorly-suited to their skills and attention span can be exemplified in two anecdotes, of course with names omitted out of respect. In the first instance, a member discussed a new z80 ASM operating system he wished to write, setting forth many of the features he wanted to include. I and others cautioned him to start small, and upon learning he was unfamiliar with z80 ASM fundamentals like bit math, recommended he start with a smaller project to cement his abilities and build up to the effort, time, and skills required to write a complete OS from scratch. Unfortunately, that suggestion was received as an attack rather than a friendly suggestion, and the project remains unfinished to this day.

A heartening counterexample can be found in another user in a similar situation, who set out to make an ambitious game. I and other users cautioned him to start smaller, and figuring that we had benevolent reasons for our recommendations, he took the advice. Months later, he completed a few smaller projects, then was able to breeze through the larger project; at the end, he looked back and agreed that he hadn't been ready for the larger project. He admitted he likely would have gotten frustrated and quit in the middle. And therein lies the problem: projects need to be grandiose enough to hold the programmer's interest (not to mention potential users' interest during the development process), but not be so elaborate that they're never finished.

And indeed, when so many fun projects cross your mind that you end up with growing lists of future and in-progress projects, it's equally vital to know when to pursue and finally complete one project, and when a project just isn't worth your time anymore. The latter category covers my Sandpaper FTP client for CALCnet and potentially Tetric B for the TI-84 Plus C Silver Edition. In both cases, I came to the realization that continuing to sink effort into the project would be a waste of my time. In the case of Sandpaper, I completed enough of the program to make it a neat proof of concept (browsing the ticalc.org archives from your calculator and transferring programs between calculators over the internet works), but I recognized that in the age of ubiquitous smartphones and laptops, it will never be more than a novelty. Perhaps a decade ago it might have been genuinely useful, but taking the time to support all the other file types and complete the Python code to download files from Cemetech and ticalc.org would be wasted effort.

The project I'm considering permanently shelving, Tetric B, falls in a subtly different category. While it works as it should and could be completed in another 5 or 10 hours of TI-BASIC coding, I don't feel that it represents a truly fun game, and would be too slow when finished. Whether it would be frustrating to users and lead them to think of me as a poor coder, or be disappointed with the TI-84+CSE as a whole, I feel I would be doing users a disservice to release it in its current form. I could spend more time trimming, optimizing, combing over the source code, but is that really a good use of my time when I could instead attempt an ASM version?

The overarching message is that there's no panacea, nor even a clear problem. Programming, building, and hacking are fun and wholesome activities, sure to help you think logically and get further in life. However, those annoying administrative details can't be ignored to keep you (and the community) happy. You must be mindful of starting and never finishing projects, probably because you picked projects you don't have the ability, focus, or time to finish. At the same time, you shouldn't hesitate to attempt something you're not positive you can do, keeping in mind that you can always drop it later and aren't contractually bound to finish the undertaking. What experiences have you had watching yourself and others start, stop, drop, and finish projects? I look forward to hearing reinforcement and counterpoint on my experiences in the calculator coding community.

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Published by KermMartian on April 18, 2013 at 12:03:42 AM CST | Discuss this article (7)

My predilection for writing 3D graphing utilities is well-documented, from Graph 3D v2.0 for the TI-73 and TI-83 written in 2003, to Graph 3D v4.0 for the TI-83 and TI-83 Plus/TI-84 Plus in 2004. Most recently, I wrote a colorful 3D graphing Add-In for the Casio Prizm called Graph3DP 1.0. Lest I leave the new color-screen TI-84 Plus C Silver Edition calculator out of the fun, I am happy to introduce a color TI-BASIC 3D grapher called Graph3D v4.1.

Graph3D v4.1 is a re-written version of my decade-old TI-BASIC 3D graphing application for the TI-84 Plus C Silver Edition, taking full advantage of the new colorful LCD. It is a fully-integrated 3D graphing utility that can graph up to 6 simultaneous 3D equations of the form Z=f(X,Y). You can edit the window settings, zoom settings, and format from within the program. You can trace over any graph, and rotate and zoom graphs from the graphscreen. Among many other tweaks, this version overhauls the rotation code to be faster and more accurate compared with its monochrome ancestor. I hope that you'll give it a try and tell me if you have any suggestions, comments, or bug reports.

Download
Graph3D v4.1 Color 3D Grapher



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