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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: 688 articles have been posted in Cemetech's News Archives. View current site statistics. Within the last seven days, 4 files have been added to the file archives. Click to show the new files.

Latest Forum Posts
Mono2Color Project by chickendude
There's no real new forums on net neutrality, so... by pip271
Physics Question by MateoConLechuga
[Tutorial] Let's learn about graphics programming! by elfprince13

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 
Cemetech Minecraft 1.8 Server: Intellectual Survival
Published by KermMartian on February 25, 2015 at 1:40:06 PM CST | Discuss this article (22)

Cemetech's Minecraft server in its current incarnation has reached 14 months of age, and over those 14 months of Minecraft 1.7 and Minecraft 1.8, we have seen a flourishing world of cities and rivalries grow. Dozens of Cemetech members have built towns and nations around our growing map, railroads connect the far reaches of the world, and almost every day sees mining, building, and PvP. Unfortunately, although we originally envisioned the map as a bastion of very creative, clever PvP, this play style is no longer tenable. Specifically, we have found that our current userbase and game mechanics make it difficult to separate the rivalries and politics of Minecraft PvP from the real world, which has led to hurt feelings, alienated players, and decreased activity. Therefore, in the spirit of revitalization, we are proud to announce Cemetech's "new" Intellectual Survival server!

What does this mean?
  • No involuntary PvP, and no stealing. You aren't allowed to attack other players, you aren't allowed to raid towns, you aren't allowed to raid wilderness bases, and you can't try to grief towns or wilderness. These are now bannable offenses.
  • You can mutually agree to arena PvP with other players, but it must be mutual.
  • The emphasis is now on building the best, most beautiful, most functional buildings, cities, and empires, rather than also trying to prevent your enemies from growing. We will be holding monthly events to encourage camaraderie and cooperation.

So what are you waiting for? Come check out the Cemetech Minecraft server at mc.cemetech.net, and bring your friends! To kick things off, the server has been visited by a mysterious rogue known only as the Jack of Spades, who has sent us the following message:

I must away from this land of mischief and hills. Alas, I have hidden my treasure of ages, with spoils and riches from the far reaches of this map you cannot begin to touch, deep within the map (or perhaps way up high?). The clues to my treasure number three, and as you search, waypoints and valuables shall mark your travels. To search, perchance to dream: a lofty checkered room from a long-fallen empire marks your first clue.

-- Jack of Spades

If you choose to pursue Jack's riddles, you may find significant riches and unique items that will make your search worth your while. I only ask that if you do so, you post screenshots of your findings here in this thread.

TI-83 Plus/TI-84 Plus Monochrome ASM on the TI-84 Plus CSE
Published by KermMartian on February 22, 2015 at 5:38:57 PM CST | Discuss this article (5)

We have been exploring the TI-84 Plus C Silver Edition and its programming capabilities for over two years now, but to date, very few monochrome assembly programs have been ported to the calculator. We have seen a shell, Doors CSE, ported from its monochrome equivalent, and games like Spaze Invaders by JamesV, Puzzle Frenzy by MateoConLechuga, and Jezzball by yours truly. However, there has been no concerted effort to port the vast library of existing monochrome programs and games from the TI-83 Plus/TI-84 Plus calculators to the color TI-84 Plus C Silver Edition (and soon the TI-84 Plus CE). That has recently changed, thanks to the efforts of MateoConLechuga, tr1p1ea, JamesV, Iambian, Hooloovoo, and other Cemetechians.

Two weeks ago, MateoConLechuga posted his first experiments making Sam Heald's famous Mario 1.2 game for the TI-83 Plus/TI-84 Plus run on the TI-84 Plus C Silver Edition. His project, later renamed the Mono2Color project, attempts to re-assemble monochrome programs for the color calculator rather than implement some sort of emulation or translation layer. The biggest necessary changes are in the LCD code; Mateo solves this by re-implementing iFastCopy and text routines to use a temporary graph buffer and half-resolution mode to get a surprisingly high framerate with minimal modifications to how the programs and games function. With feedback and parallel work from JamesV, Iambian, and tr1p1ea, additional programs were tested with this technique, including JamesV's Alien Breed 5, a 3D maze program, a 3D Rubik's Cube program, and a tunnel game. They continue to try to make it even easier to create fast, high-quality ports of monochrome assembly programs, so please stop by the Mono2Color project thread and offer feedback, encouragement, and if you're an assembly programmer, your expertise. In addition, I'm exploring how feasible it is to include helper functions to make Mono2Color projects work with Doors CSE for the TI-84 Plus C Silver Edition and TI-84 Plus CE, and MateoConLechuga (and now me) will be working on a MobileTunes CSE port of the storied 4-channel TI-83 Plus/TI-84 Plus music player.

Serendipitously, Hooloovoo has also posted a topic showing off his work creating a TI-84 Plus C Silver Edition port of Michael Vincent's emu8x emulator. His work will allow at least the TI-82, TI-83, TI-85, and TI-86 to be emulated on the color calculator(s); his biggest obstacles at this point are also fast, efficient LCD emulation code. We will be following his progress keenly, and hope that this is a project that will find a home on many users' TI-84 Plus C Silver Editions in the months to come.

More Information
Mono2Color project
MobileTunes CSE music player project
emu8x Comes to the TI-84 Plus C Silver Edition
[TI-84+CE] Doors CSE (CE?) 9 and xLIBC(E) Brainstorming

From left: MobileTunes CSE, Mono2Color, and emu8x CSE

STEM Behind Hollywood: Science Friction for TI-84 Plus C SE
Published by KermMartian on February 9, 2015 at 9:58:06 PM CST | Discuss this article (9)

At last, all five of TI Education's STEM Behind Hollywood activities for the TI-Nspire are available for the TI-84 Plus C Silver Edition! Over the past four months, I have been porting the exciting STEM Behind Hollywood activities to the TI-84+CSE using the Hybrid BASIC functions in Doors CSE 8, and with today's release of Science Friction for the TI-84 Plus C SE, the complete set is available for both the TI-84 Plus C SE and the TI-Nspire. The TI-84 Plus C Silver Edition versions replicate all the lessons about friction, forensics, anatomy, chemistry, astrophysics, gravity, and more, with engaging plots and interactive simulations for students to explore. I am thrilled to complete the set of TI-84 Plus C SE STEM Behind Hollywood activities with the release of Science Friction for the TI-84 Plus C Silver Edition.

In Science Friction, students will learn about static and kinetic friction and Newton's second and third laws of motion in this superhero-centric activity. After students get a background in how mass, normal force, and the coefficient of friction are related, they play the role of the henchperson to a villainous civil engineer trying to sabotage a new bridge. They must spray a concrete roadway with oil, water, or ice to stop the hero from saving the bridge, using their knowledge of friction to figure out the best substance to use.

Made for Doors CSE 8.1 or higher, Science Friction for the TI-84+CSE provides the same fun, real-world lessons about friction and Newton's second and third laws of motion as the TI-Nspire activity. Besides the on-calculator activity itself, it includes thorough teacher notes and a student handout, both heavily adapted from TI's original material. We would love to hear your feedback in the attached topic if you use this activity in your own classroom. We respectfully salute Texas Instruments and their hard work in creating the original material for this activity. We hope we'll have a chance to work with TI more closely as we continue to bring educational activities and programs to the ever-popular TI-84 Plus Silver Edition, and anticipate bringing STEM Behind Hollywood to the new TI-84 Plus CE as soon as our real jobs permit.

Science Friction activity for the TI-84 Plus C Silver Edition

Projects of the Month: January 2015
Published by tifreak8x on February 1, 2015 at 7:57:36 PM CST | Discuss this article (13)

What better way to bring on the new year, and enter into February, then by bringing you all the news of projects old and new for the new year! :D
  • TILP: Lionel Debroux has posted up updates that have come to TILP, taking out a few bugs, adding some fixes, and more! Take a look at the topic to get a more in depth view of the list of changes.
  • Koch Curve Fractal: MasterChief56 has taken the time to bring this interesting fractal setup to the TI-84+CSE in TI-BASIC. There's a larger description on what the fractal is and more information on how it is calculated, so make sure to check out the topic for more information.
  • Image Compression: Unknownloner has brought us an interesting converter to allow for jpegs to be converted over to the CSE graphing calculators with varying degrees of quality. He shows off a few screenshots and what amount of memory it takes up, so take a look if you've wanted to put up some cool pics to your calculator, especially if you're an assembly programmer looking to use large images in your programs.
  • z80 CPU Derived Clock: This project utilizes DrDnar's speed test program to determine the speed of the calculator's processor on the monochrome models. Check this out if you need a way to verify your program is running consistently across various models of calculators!
  • Solitaire: Klondike and Freecell: DrDnar has killed off a bug that was found, in where if you were to exit the game utilizing certain buttons, it wouldn't remove that data from the program and it would exit immediately. Make sure you get updated to the latest version so this isn't a problem for you as well!
  • Caticle Chronicles: Supposed to be additions to the Cemetech Contest #13 project, Cat Nipper by Unicorn. Take a look at this topic to see the prequel and sequel that is in development.
  • Flatforme: This is an interesting project by 123outerme, where you have to jump to various platforms get the thing to let you get to the next level. A lot of work has been put into this project, which you can see by checking out the screenshots in the topic. Bounce in and give him some ideas for this fantastic project.
  • FunkLibrary/Sublime Text z80 package: A handy tool by NanoWar for z80 programmers who use Sublime 2/3. It contains numerous macros and syntax highlighting, which is always a plus for any programmer.
  • Wizards: Wizards is a long-running project by NanoWar, started some 10 years ago! He's posted up a few shots of the progression the game has made over the years, along with a download link and posted up some instruction on how to play this card game. Give it a shot, and let him know what you think.
  • Two Step: Two Step is a puzzle game in development by Muessigb, where you get only two moves to solve a series of puzzles. He has a lot of fascinating features listed in his topic, so go check it out.
  • GLib: GLib is a 3D engine system developed in Axiom to assist programmers in writing 3D programs on the 83+/84+ calculators. He shows off the capabilities of the library in a screenshot, and I have to say it looks pretty fantastic!
  • Axagon: As covered in last month's POTM article, this game is a port from an online flash game called Hexagon. matrefeytontias has brought us a final release, showing off the latest improvements to the game and a download link, if you're interested in grabbing the game!
  • [e]Z80 Disassembler: DrDnar decided to put a day to good use and created this disassembler that works with both Z80 and eZ80 platforms! This will no doubt become a very useful tool for those wanting to know more about the upcoming TI-84+CE!
  • SPASM: calc84maniac forked a forked version of SPASM to add in eZ80 support! This is an amazing thing, having the tools necessary to work with a calculator that has not even been released yet.
  • Alien Breed 5 Ep II: JamesV has been hard at work on his Alien Breed game, adding all sorts of new features and functions to his game. He's added little and big things to the game, all listed in the topic with screenshots to boot!
  • Portal Nspire: ldstudios has been hard at work on this project, revamping certain aspects of the game and adding a ton more to it with new objects. His enthusiasm for its development is flagging, so if you have Lua experience or simply encouragement to offer, please post in his topic.
  • Portal CSE: MateoConLechuga has been quite busy and active with his Portal version. There has been so much added to the game, there are literately pages of updates, suggestions and more. Go check it out and prep yourself for a bit of fun filled reading!
  • Lisp on 83+/84+: Hooloovoo has taken up the task of bringing Lisp to the 83+ line of calculators, using code from around 30 years ago for z80 based machines. If you love Lisp, this could be the project you have always wanted on your graphing calculator.
  • Zombie Apocalypse Part II: Kerm released the second part of the STEM Behind Hollywood series of Nspire projects for the CSE line of calculators. It covers various aspects of a 'what if' scenario on a zombie outbreak and how a cure to the virus might be deduced.
  • Body of Evidence: Following Zombie Apocalypse Part II, Kerm quickly pumped out this STEM item, which covers how to identify a decomposing body by using various techniques and fields of study to accomplish the task.

As always, I apologize if your project didn't make it up here; as you can see there were quite a few to look through and to post about. I look forward to seeing all the projects that you cool people will bring us next month!


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