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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.

Our members, enthusiasts, experts, and teachers are led by Kerm Martian, né Christopher Mitchell. Since 2004 he held the title of the world's most prolific graphing calculator programmer, with over 400 completed programs and more than 1.2 million direct downloads. He has also developed many software and hardware projects. Our staff of friendly volunteers hang out on our forum and IRC and SAX chatrooms, and are happy to answer questions.

Numbers: 697 articles have been posted in Cemetech's News Archives. View current site statistics. Within the last seven days, 8 files have been added to the file archives. Click to show the new files.

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Cemetech Labs Updates
Take Pictures with a TI-84+CSE and a Gameboy Camera on 11/14/2014
WiFi globalCALCnet with the Spark Core on 10/5/2014
Developing WiFi Calculator Communication with the Spark Core on 9/27/2014
PartyMode 2.0: The One-Room Instant Disco on 6/22/2014

SourceCoder 3 TI-BASIC Editor/IDE  jsTIfied online TI-83+/TI-84+ emulator  Cemetech Forum  Cemetech Projects  TI-83+/84+ Programs and Games  Casio Prizm Programs and Games  Using the TI-83 Plus/TI-84 Plus  Programming the TI-83 Plus/84 Plus  Doors CS 7  United-TI Fora  WikiPrizm 
Hands-On with the TI-84 Plus CE: Full Review
Published by KermMartian on April 6, 2015 at 2:00:20 PM CST | Discuss this article (32)

Two years ago, in February 2013, Cemetech got its hands on an early sample of the TI-84 Plus C Silver Edition thanks to TI Education's generosity, and I quickly wrote a hands-on review of the TI-84 Plus C Silver Edition. Now, I have my very own Radical Red TI-84 Plus CE, as previously announced via photograph, and I'm excited to share my hands-on experiences with the TI-84 Plus CE with you. The TI-84 Plus CE largely brings the existing math features of the TI-84 Plus C Silver Edition to a thinner, faster, lighter calculator, so I'll be focusing on the new calculator's physical characteristics, hardware, and speed. Of course, I'll reiterate my observations about the math features of the TI-84 Plus CSE and TI-84 Plus CE from my TI-84 Plus CSE review for our readers more accustomed to the monochrome TI-83 Plus and TI-84 Plus family. In short, the TI-84 Plus CE addresses complaints about the speed of the two-year-old TI-84 Plus C Silver Edition and is a thin, light, easy-to-use device with familiar math and science features.

Read the full review for all the details, along with more screenshots and photos!

The Big Picture
The TI-84 Plus CE combines all of the math, science, engineering, and programming tools of the TI-84 Plus C Silver Edition with a thin, light case, a fast processor with plenty of RAM, and a better battery. The software features of the calculator have been proven over the past several decades, and millions of students and teachers are already familiar with how to use the calculator. The novelty of this new calculator is the modern design, the pleasing size and weight, and the better technical specifications that add up to a more pleasant user experience. While you won't be computing the determinant of a matrix or graphing a sinusoid more than 50% faster than before, the day-to-day math features feel faster, more responsive, and less frustrating. If you're a power user who explores TI-BASIC or Assembly programming, the new calculator's features will mean a world of difference for you, both simply in the responsiveness of the calculator and in the many new possibilities the large RAM, memory-mapped LCD and I/O, and ez80 processor provide.

The TI-84 Plus CE will be available in eight colors for $129 in retailers early this summer, the same price point as its older, thicker, heavier sibling, the TI-84 Plus C Silver Edition. We recommend it as the best option in the TI-84 Plus family to anyone looking for a math and science tool or a programming tool. The OS feels fast and remains full-featured, the battery, processor, memory, and LCD have been improved in the past two years, and the thin, light, colorful case will no doubt excite students and their parents.

Read the full review for all the details, along with more screenshots and photos!

For more specs, references, history, and information on the TI-84 Plus CE, please refer to our TI-84 Plus CE reference page.

Projects of the Month: March 2015
Published by tifreak8x on April 1, 2015 at 5:21:21 PM CST | Discuss this article (9)

Hey there, Cemetechians! It's that time again, where I shower you with all the happenings in calc programming over the last month. What's that? Can't trust anything you read on the internet posted today? Well, then the joke is on you, as there was an incredible amount of effort put in by the community to offer humor, education, and all around entertainment for you and your calculator! No fooling of April going on in this place this year!

Without further ado, I present to you the myriad of projects seen on Cemetech over the last month:
  • BasicNote: A project started by Michael2_3B, this is a BASIC note taker/editor. It appears to have a nice menu setup so far, and some big plans, so go check them out and let them know what you think!
  • Fruit Ninja CSE:Yet another project by MI Wright, this is a BASIC fruit ninja game that lets you use your own background images. It started as an experiment to see if he could quickly use TI-BASIC and the keypad to determine the shape of "swipes" across the calculators keyboard, and evolved to a Fruit Ninja game from there. Looks like a fun game, go check it out!
  • Windows 10 Educational: Project by solarsoftware, which looks really nice graphically. To be honest, I don't know the overall endgame for the project, but it looks like they have some pretty good graphics designing and programming skills, so bounce over and let them know what you think of their progress!
  • Bejeweled CSE: Something I'm surprised that it took this long to make it on the calc, Bejeweled, everyone's favorite pass time game on your cellphone, is now being brought to you on your CSE! unknownloner is bringing beautiful graphics on background images. Not really much else to say on the matter, other than this is simply amazing! Go check it out in his topic and let him know your thoughts to his project!
  • Source: Project by iconmaster to create a better language for the HP Prime, and potentially other calculators in the future. The compiler is run via java, so it is easily compiled on anything that runs Java. Check it out and maybe step up to help if you can, to expand this fairly impressive sounding project!
  • First Fantasy: Mana Force: An RPG update, from the 83+ to the 84+CSE, utilizing the BASIC libraries from DoorsCSE to add color and other cool features to the game. This project brought to you by the RPG master, DJ_O!
  • TwoStep: Challenging puzzle game by Muessigb, written in a mixture of Axe and ASM with some pretty impressive graphics. This game has an impressive array of features, which can be found in the first post. Looking at the screenshots, it looks like some of these levels will be quite challenging, so go check out this project!
  • KnightOS: Updates have been posted to the KnightOS thread by Vijfhoek, listing off numerous new features to both OS and the website. The project has garnered new members, whom are helping all over the projects spectrum. Check out the thread for all the updates!
  • Solius: Solius is a rogue like game being made by 123outerme for the 84+CSE with xlibc hybrid support. The game is in its infancy, but he has big plans for the game, which you can tell via the current todo list! Check it out, offer up ideas and support and let's bring another cool hybrid game into existence!
  • nKaruga: Matref has brought an update to his spaceship shooter game for the Nspire. The update had to do with the 'big lasers' (who doesn't love big lasers, though?) and they were recoded. Check out the thread in the topic and let him know what you think!
  • Caticle Chronicles: Unicorn has released some updates to his Caticle Chronicles, which are described in his topic. He also shows off some gameplay for his game, so go give it a look and let him know what you think!
  • Slender: The Eight Pages: Continuing progress from Acagliano, shows off a pretty wicked title screen. Seems he has some issues with a bug, so if you lovely folks could go pass some encouragement, or maybe even help him break the bug, I'm sure he'd appreciate it!
  • D-Fend: 123outerme wrote up a BASIC game for the CSE where you have to defend your side of the screen from evil things with a GIANT LASER. Sounds cool, right? Game comes with various hardness levels, check it out if you are suffering from boredom between classes.
  • Convobot: This cute little program idea by chauronslilsis was inspired by our ever favorite nikkybot. So far with this project, as it is released, doesn't really link answers to questions asked, and gives you a random answer to a question. There is a possibility at a later date for a new version to have better answers related to questions, so go on and give her a poke, and let her know how much you want the upgraded version!
  • CSE Roguelike: Interesting project by unknownloner, utilizing SDCC to compile C on the CSE calculator, and now has characters bouncing around the screen. He's got a few interesting details about his game in progress posted up, so take a look at the topic and help encourage the continuation of this fun looking game!
  • HP Prime RPN keystroke programming simulator: Project by newcomer EdPi314, this brings RPN programming to the Prime via editmacro and runmacro. There's a list of features and a download link, so if this is of interest to you, you should take a look. Always refreshing to see new Prime projects being posted about!
  • Prime Periodic Table: iconmaster has brought about a pretty nice and professional looking Periodic Table program to the Prime, and even shared the source for the project in the post. For any out there wanting to learn more about the Prime's programming language, or if you just need a good periodic table program, you should really check out this project!
  • Custom Formula Pro: Electromagnet8 has released a new version to an old project, written in TI BASIC and claims to be able to be modified to fit almost any set of formula. Check out the topic for screenshots and more information regarding this program.
  • Prime Game of Life: Another Prime project by iconmaster. The game of life, 2 versions in fact, with source code shared in the topic. (Honestly, I still lack proper understanding of what this type of program is good for, someday I shall learn). Check it out if you'd like to see more of the Prime language!
  • Portal Returns: Mateo has released this Portal project to the world in a more final form! It includes 78 levels, and some pretty amazing graphics! Check out the topic for a link to the download and get playing on this impressive game!
  • Text Viewer: Mateo started up this project to have a displayer for text programs generated by Document DE online converter, and it's going on a pretty good start! There's a bit of a push to hopefully integrate an editor in there as well, so students can take notes with their calcs. Hit the topic and help motivate the completion of this project!
  • TokenIDE: The long standing project by Merthsoft has received some updates! It has gotten a new detokenizer and tokenizer, and some bugs have been repaired. He's asking that anyone that has a feature request bounce into the topic and post it up!
  • Turtle Graphics: Merthsoft has brought out Turtle Graphics, which is a feature of the Logo programming language. Merthsoft has setup an interpreter to display various graphics. Check out the thread for some awesome screenshots and more information on the language!
  • CBL Whack-a-mole: If you are lucky enough to stumble across a CBL2 with a light sensor, then this could be a game for you to make use of the device! Merthsoft devised this little game after stumbling across the items at a pawn shop, and utilized xLIBc libraries to build the game.
  • The Potato One: Anyone a fan of Doctor Who might automatically get this reference and know who is being talked about. This program, created by tifreak8x, generates random 'attack strategies' based on a flow chart floating around the internet. Check out the topic and program if you want yourself a quick laugh.

And that concludes this PotM post! Keep up the fantastic work, you awesome programmers, and we'll get you updated next month, hopefully even a little closer to on time!

T^3 2015 Wrap-Up: Days 2 and 3, Final Thoughts
Published by KermMartian on March 21, 2015 at 6:14:33 PM CST | Discuss this article (7)

This weekend, I attended my third T^3 (Teachers Teaching Technology) conference, immersing myself in learning how graphing calculators can enrich the STEM classroom. I spent three days at this annual professional development conference hosted by TI Education; Cemetech has already hosted articles about TI news leading up to the conference, the exciting kickoff and opening session, and shared interesting experiences halfway through the weekend. Now that the conference is over and the responsibilities of regular life have descended once more, it's time to look back at the conference and everything we experienced.

Read the whole article for more fun photos from T^3 2015.

Here's what happened during the final day and a half of the conference. In our most recent T^3 article, I mentioned giving a talk on calculator programming shortly before Pi Second, at which TI served several varieties of delicious pie.
  • In fact, Saturday, March 14th was full of all kinds of Pi Day celebrations: it turns out that math and science educators are the perfect crowd with whom to celebrate Pi Day. Besides four or five different varieties of pie at the conference, there was a contest to recite as many digits of pi as possible. I clocked in at a mere 53 digits; the first-place winner recited an impressive 120 digits and received a pizza stone engraved with many digits of pi. I myself got a cool MathemaTIcian shirt and pi pencils for my efforts. Later in the day, TI served pizza, including a pizza with pi formed out of pepperonis on top. To get a slice of pizza, all you needed to do was recite at least 15 digits of pi.
  • For the last couple of years, there has been a long Lua session on one of the days of T^3. Called SLUGfest (Super Lua User Group fest), it's an opportunity for Lua experts and beginners to get together to discuss Lua skills and tricks, particularly as they apply to the TI-Nspire. This year, I was particularly excited to see TI's efforts to promote connecting hardware to the TI-Nspire. Stephen Arnold presented the TI-Nspire Apps for iPad controlling the TI Launchpad MSP430 development board over Bluetooth, and mentioned that they're planning to make the system work with TI-Nspire CX handhelds as well. His demos included a keyboard program that could play a wave of a given shape, amplitude, frequency, and duration over a speaker attached to the microcontroller, a greenhouse with sensors and the ability to build control systems, and a host of other sensor-related projects. We hope that we'll have a chance to help guide these same projects onto the TI-84 Plus series, given our work with ArTICL and many other calculator hardware projects.
  • I participated in TI's first "Tweetup", to which they invited the conference attendees who had been posting statuses and pictures about the conference on Twitter. There was good food, good conversation, and not only did I get a Radical Red TI-84 Plus CE of my own, I won a second one that I ended up declining to avoid hogging all the TI-84 Plus CE (Cemetech user DrDnar ended up with it).
  • The last day of the conference included power sessions, of which I attended a panel about STEM education, and a closing keynote by Emily Calandrelli. I enjoyed getting different perspectives on promoting STEM education and what can be done in math and science classrooms to get students excited about STEM topics in the power session. I also found Ms. Calandrelli's talk to be quite inspiring: she emphasized why STEM is awesome. First, it can make you uncomfortable, and force you out of your comfort zone. Second, it gives you the superpowers to understand the world around you, to be curious, and to attack any problem. Finally, it gives you a ticket to travel and see the world, as many companies and internships will pay you to travel while you pursue STEM projects and jobs. I had the privilege of meeting Ms. Calandrelli at TI's "Tweetup" on Saturday evening as well, and found her to be very personable; she was very involved and enthusiastic about the teaching and learning going on throughout the conference.

I found the conference to be probably the best-attended of the three T^3s that I have experienced, and it was a great opportunity to meet new teachers, TI employees from all over the company, and exhibitors, as well as catch up with old friends. I'm very excited about the conversations (sorry, the conversaTIons) that I had at the conference, including with teachers excited about bringing programming, electronics, and other STEM skills into their own classrooms. I hope you can come check out T^3 in future years, whether you're a teacher, a student, or just a calculator programming community member who is curious to see passion for our favorite handheld devices on the educational side of things.

Left to right: Gayle Mujica and Dr. Peter Balyta kick off the conference; using the TI-84 Plus CE; presenting TI-BASIC on the TI-83 Plus/TI-84 Plus family and a rapt audience member; exploring the TI-84 Plus CE further; Emily Calandrelli during the closing session.

Happy Ultimate Pi Day: T^3 2015 Mid-Conference Updates
Published by KermMartian on March 14, 2015 at 1:11:55 PM CST | Discuss this article (26)

We've enjoyed a day and a half of TI Education's T^3 2015 conference in Fort Worth, TX, and as we head into a sunny, warm afternoon of sessions, I wanted to briefly update you on what we've been exploring and experiencing at the conference. We also want to wish you a very happy Pi Day. Some are calling this an "ultimate" Pi Day, as the year 2015 gives us the (US-formatted) date 3/14/15. At 9:26:53am, TI hosted a celebration with pie and coffee, well-attended by the conference attendees. What are you doing to celebrate this Pi day? We hope that your celebrations involve pi recitations and certainly some delicious pie.

Some updates from T^3 2015:
  • As announced during yesterday's opening session, TI's popular STEM Behind Hollywood initiative (of which we have made complete TI-84 Plus C Silver Edition ports will now be joined by STEM Behind Health. These new Lua activities will show how math, science, and engineering are involved in health and healthcare. The first activity released is Type 1 Diabetes: Managing a Critical Ratio, which challenges students using the TI-Nspire CX to explore ratios and proportionality, biological control mechanisms, and more.
  • We are excited to continue promoting graphing calculator programming as a perfect way to get students involved in STEM. I've enjoyed talking to a number of teachers this year that have integrated TI-BASIC programming into their math and science curricula or are considering doing so, and we'll likely have some exciting news to share around graphing calculator programming in schools in the near future. I also attended an excellent talk by the enthusiastic John Isaacs, a constant proponent of my programming book, on introductory TI-BASIC programming.
  • I spoke this morning about graphing calculator programming in the classroom, primarily to math and science teachers. You can download my T^3 2015 presentation, and if you're interested in buying Programming the TI-83 Plus/TI-84 Plus or Using the TI-83 Plus/TI-84 Plus today, you can get 41% off both books with code "ctwt3ic".
  • At the T^3 2015 reception last night, there was much Texas line-dancing in celebration both of our host state and Texas Instruments' heritage. Math and science educators and engineers are enthusiastic and skilled at line dancing, it turns out! There were also delicious hors d'oeuvres and costumed photography fun.
  • At long last, DrDnar and I both had the opportunity to try out the TI-84 Plus CE in a session taught by John LaMaster. We're not posting official impressions yet, as we haven't had enough time to fairly evaluate the device, but it looks like the screen speed in particular has been greatly improved by 2.6x or more thanks to the new memory-mapped LCD and ez80 processor, while math operations are roughly 15-20% faster. We also got to see some of the features of the new TI Connect CE and TI-SmartView in action.
  • Finally, we have had the pleasant opportunity to talk to a lot of TI engineers and staff here at the conference, and it's great to see the people who make TI's calculators possible interacting with their target audience.

Once again, happy Pi day, and we can't wait to bring you news on the rest of the conference tomorrow!

Left to right: Yours truly with the TI-84+CE; running an ez80 ASM program on the TI-84+CE; exploring TI-BASIC with John Isaacs; Texas line-dancing; a Texas sunrise; Pi Day pie from TI. Bonus points for finding the zombie from Zombie Apocalypse Parts 1 and 2 in the photos.


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