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Christopher Mitchell

@kermmartian.z80.me
713 followers 41 following 151 posts

Director of Geospatial AI @nbcuniversal.com, CS Ph.D., founder @Cemetech, hardware and software hacker, distributed systems guru, lover of trains. Opinions are my own.

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Christopher Mitchell @kermmartian.z80.me · 12/10/2026
RIP to the ez80, long live z80 and ez80-based devices. I ardently hope for some [e]z80 OSH IP in the future.
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Christopher Mitchell @kermmartian.z80.me · 09/08/2026
I was pleasantly surprised to discover "the Hollywood Carney's, a hot dog stand in a different converted railroad dining car" right by my hotel in LA, and the food was delicious to boot. #trains (TBBT got something right!)
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Christopher Mitchell @kermmartian.z80.me · 09/08/2026
What a cursed sentence this is.
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Christopher Mitchell @kermmartian.z80.me · 09/08/2026
A dishwasher would improve my QoL, but an in-apartment washing machine would improve it more. That's the dream of a every NYC resident without one.
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Christopher Mitchell @kermmartian.z80.me · 28/07/2026
Honey-lemon/basil? What's the verdict?
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Christopher Mitchell @kermmartian.z80.me · 28/07/2026
I managed to catch one of the few units that's been painted into the new Great British Railways livery on a recent UK trip, here at London Fenchurch and Upminster. #gbr #uktrains #trains
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Reposted by Christopher Mitchell
Thomas Dickerson @elfprince13.mumak.app · 13/06/2026
Join @kermmartian.z80.me’s team if you enjoy procedural modeling!
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Reposted by Christopher Mitchell
Thomas Dickerson @elfprince13.mumak.app · 25/06/2026
If your modern C++ is solid this is in @kermmartian.z80.me’s org: jobs.smartrecruiters.com/NBCUniversal...
jobs.smartrecruiters.com
Senior Systems Engineer (C++/Python)
Company Description: NBCUniversal is one of the world's leading media and entertainment companies. We create world-class content, which we distribute across our portfolio of film, television, and stre...
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Christopher Mitchell @kermmartian.z80.me · 13/06/2026
‪I'm looking to add more Procedural Developers/Tech Artists to my team. Are you a Houdini wiz with experience creating environments? Do you love acronyms ending in OPs? Please also point others my way! Staff: jobs.smartrecruiters.com/NBCUniversal..., Senior: jobs.smartrecruiters.com/NBCUniversal....
jobs.smartrecruiters.com
Staff Game Specialist
Company Description: NBCUniversal is one of the world's leading media and entertainment companies. We create world-class content, which we distribute across our portfolio of film, television, and stre...
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Christopher Mitchell @kermmartian.z80.me · 01/06/2026
For some reason, Latin appears to be involved.
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Christopher Mitchell @kermmartian.z80.me · 16/05/2026
And not just the men, but the women and the children, too!
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Christopher Mitchell @kermmartian.z80.me · 16/05/2026
I spent a three-day train ride across the country adding support for @ticalculators.bsky.social's newest graphing calculator to Cemetech's web-based IDE, SourceCoder 3. View, edit, and export TI-BASIC programs (and other files) for the TI-84 Evo in your browser. www.cemetech.net/news/2026/5/...
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Cemetech @cemetech.net · 11/05/2026
Coming soon: TI-84 Evo support in SourceCoder 3, so you can created and edit Evo programs, variables, and images right on your computer.
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Christopher Mitchell @kermmartian.z80.me · 29/04/2026
Me too! I'll miss it.
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Christopher Mitchell @kermmartian.z80.me · 29/04/2026
Mine is still on (pre) order from Amazon, but I'll post some hands-on experiences with it as soon as I'm able.
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Cemetech @cemetech.net · 29/04/2026
The TI-84 Evo is here. An ARM Cortex-driven calculator in seven colors, running at 156MHz with double the storage of the TI-84 Plus CE, it appears to have a significantly redesigned OS that retains keypress compatibility with 30 years of TI-83/TI-84 Plus calcs. More: www.cemetech.net/news/2026/4/...
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Reposted by Christopher Mitchell
Cemetech @cemetech.net · 19/04/2026
The Youtube video has been since taken down for now, but TI-Planet admin critor grabbed it first. We're looking forward to putting TI's new TI-84 Evo through its paces at the beginning of May to see if it's truly an improvement on one of our favorite calculators. www.cemetech.net/forum/viewto...
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Christopher Mitchell @kermmartian.z80.me · 15/04/2026
I'll never make that infamous mistake again...
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Cemetech @cemetech.net · 15/04/2026
Cemetechians have spotted more photos and marketing materials about the new TI-84 Evo calculator, reportedly coming at the end of this month: www.cemetech.net/forum/viewto...
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Reposted by Christopher Mitchell
Cemetech @cemetech.net · 22/03/2026
The results for our 2025 Projects of the Year are in! Screensaver CE gets the gold medal for classic and new screensavers on your TI calculator, while a graphics library, an HP Prime Tetris game, and a flamethrower with an embedded calculator join it on the podium. www.cemetech.net/news/2026/3/...
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Christopher Mitchell @kermmartian.z80.me · 02/03/2026
That's the LED that lights up when the us-east-1 zone on AWS goes down.
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Cemetech @cemetech.net · 01/03/2026
Fifteen DIY coding/hacking projects won or tied as "Projects of the Month" on Cemetech in 2025: now it's time to choose the best of the best. Games, screensavers, utilities, and a calculator flamethrower await: www.cemetech.net/news/2026/3/...
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Christopher Mitchell @kermmartian.z80.me · 01/03/2026
Thanks to geekboy1011's laser engraving expertise and ablating powder coating, I now have a good way to add durable, attractive labels to my simulator panels.
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Reposted by Christopher Mitchell
Cemetech @cemetech.net · 10/02/2026
Here's (almost) everything we know about the new TI-84 Evo calculator from Texas Instruments (3x faster CPU, more storage, new UI...): youtu.be/EsLICWjasoo
youtu.be
NEW TI Calculator Discovered: TI-84 Evo
YouTube video by KermMartian
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Christopher Mitchell @kermmartian.z80.me · 02/02/2026
And because it continues to be such an unexpected item of interest, I made a video about my process of connecting a physical GSM-R driver's control panel to @trainsimworld.com's Train Sim World: www.youtube.com/watch?v=UrSw...
youtube.com
Simulating GSM-R in Train Sim World 6
YouTube video by KermMartian
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Christopher Mitchell @kermmartian.z80.me · 31/01/2026
The irony is that there's a TI-84 Plus CE Python Edition that can be programmed in Python and was introduced in 2021, but TI seems to be sweeping that under the rug.
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Cemetech @cemetech.net · 31/01/2026
New info on the upcoming TI-84 Plus Evo graphing calculator, thanks to MateoConLechuga: USB-C, 3.5MB Flash storage, a smoother font, wider graphing, and a possible change to the TI Innovator accessories making them incompatible with the TI-84 Plus CE. Discussion: www.cemetech.net/forum/viewto...
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Cemetech @cemetech.net · 27/01/2026
Eleven years after the TI-84 Plus CE, the color screen version of the immortal TI-84 Plus calculator, @ticalculators.bsky.social will likely be releasing the TI-84 Evo. Leaks point to UI upgrades mirroring Casio and HP calcs, 3x faster CPU, and rearranged buttons. www.cemetech.net/news/2026/1/...
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Christopher Mitchell @kermmartian.z80.me · 19/01/2026
The most common question I've gotten on my train simulator lately is how I managed to connect a GSM-R Driver's Control Panel (DCP) to my simulator. Although just a glorified display and keypad (no radio whatsoever is involved), it's popular for immersive simulation. Here's how: z80.me/blog/tsc-gsmr/
z80.me
Train Simulator Controller: Simulating a GSM-R Driver's Control Panel
GSM-R is the latest secure way for UK train drivers to communicate with signallers (dispatchers) and other drivers. Modern UK trains have a Driver’s Control Panel (DCP) with a display and buttons, but...
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Christopher Mitchell @kermmartian.z80.me · 11/01/2026
Tasty Speyside and Highland, but where's your Islay? :(
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Christopher Mitchell @kermmartian.z80.me · 09/01/2026
Some of that nighttime ambience from my Class 80x train simulator finally coming together. @trainsimworld.com
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Christopher Mitchell @kermmartian.z80.me · 06/01/2026
Websiteslop.
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Christopher Mitchell @kermmartian.z80.me · 02/01/2026
Nice job! I implemented a small CNN, but it's no LM: z80.me/blog/calcula...
z80.me
"AI" on a Calculator: Part 1 | Blog | Christopher Mitchell, Ph.D.
Can AI run on a calculator? Machine learning and computer vision algorithms can certainly be run on a calculator albeit slowly: I ported a convolutional neural network (CNN) to a TI-84 Plus CE, making...
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Christopher Mitchell @kermmartian.z80.me · 28/12/2025
In a recent video by UK train company @lner.co.uk, a guest trying one of their simulators commented, "[you] could sell these [simulators ...] imagine going to my boyfriend saying, 'Hi, darling. I've got a new train simulator. This is taking up the entire bedroom, BTW.'" And I took that personally.
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Cemetech @cemetech.net · 27/12/2025
Do you like flying toasters, word games, crossword puzzles, or building operating systems for 8-bit CPUs? If so, November's Projects of the Month at Cemetech have you covered: www.cemetech.net/news/2025/12...
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Christopher Mitchell @kermmartian.z80.me · 28/12/2025
I've been fighting the good fight of improving @elfprince13.mumak.app 's sartorial choices for two decades, to extremely limited success. When I suggest a tie, I get a TIE, and of *course* kangaroo leather maketh a toe shoe a dress toe shoe.
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Christopher Mitchell @kermmartian.z80.me · 27/12/2025
This is the way. When you've been using brutal soap to get grease, oil, and 100-year-old dirt off your hands several times during the day, you need an equally powerful hand cream.
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Christopher Mitchell @kermmartian.z80.me · 13/12/2025
Thanks, dad.
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Christopher Mitchell @kermmartian.z80.me · 13/12/2025
This is superb, thanks for sharing. Who knew that what I needed was the combination of two songs I've listened to on Youtube many times (thanks, Clamavi de Profundis).
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Christopher Mitchell @kermmartian.z80.me · 08/12/2025
Thank you! Amusingly, this very topic came up in a discussion that did not involve @elfprince13.mumak.app last night, and I continue to squarely insist I never saw the time he thinks I did.
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Christopher Mitchell @kermmartian.z80.me · 06/12/2025
Another day, another phalanx of CAN bus controllers for my increasingly sprawling train simulator. #trains #simulator
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Reposted by Christopher Mitchell
Cemetech @cemetech.net · 29/11/2025
Arcade games galore, and more: Projects of the Month for October 2025 is here, with calculator and computer games (and beyond): www.cemetech.net/news/2025/11...
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Christopher Mitchell @kermmartian.z80.me · 19/11/2025
So excited to hear this! I'm in the midst of my third rewatch of the Stargate shows, introducing someone to their first viewing, so it's especially apropos.
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Andrew Liptak @andrewliptak.com · 19/11/2025
Eeeeeeeee! I was never a huge Star Trek person, but Stargate SG-1 was *my* show. I'm really excited to see that they're not only doing a new series, but that it's apparently not a reboot / reimagining but a continuation. transfer-orbit.ghost.io/amazon-starg...
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Christopher Mitchell @kermmartian.z80.me · 18/11/2025
Last time, I showed one of the panels (TPWS) going into my train simulator; now, prototyping the complete dashboard section of my simulated UK Class 80x containing that panel: z80.me/blog/tsc-das... #trainsimulator
z80.me
Train Simulator Controller: Dashboard Prototyping, Part 3
After a cardboard prototype of the center console of my Class 80x simulator, I created a functional hardboard version and took it for a spin.
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Christopher Mitchell @kermmartian.z80.me · 16/11/2025
My UK Class 80x train simulator project continues, with a painstakingly recreated TPWS panel, simulating a key safety system: z80.me/blog/tsc-tpws/
z80.me
Train Simulator Controller: TPWS Control Panel
TPWS is a key safety system in UK trains, so my Class 80x cab needed a precisely replicated TPWS control panel.
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Christopher Mitchell @kermmartian.z80.me · 10/11/2025
I think it's that time again.
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Reposted by Christopher Mitchell
Cemetech @cemetech.net · 29/09/2025
We woke up just before September ends: our August 2025 Projects of the Month is live. Tetrises, RPGs, hardware projects, for graphing calculators and beyond: see what our creative hobbyists have been making, and vote for the best: www.cemetech.net/news/2025/9/...
cemetech.net
Projects of the Month: August 2025 | News | Cemetech
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Christopher Mitchell @kermmartian.z80.me · 07/09/2025
Indeed.
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Christopher Mitchell @kermmartian.z80.me · 07/09/2025
Another month, more progress towards constructing my full-scale train simulator, now with laser-cut hardboard to test out its 1:1 component layout: z80.me/blog/tsc-das...
z80.me
Train Simulator Controller: Dashboard Prototyping, Part 2
My cardboard prototype of the central portion of a Class 80x dashboard allowed me to iterate to a laser-cut hardboard prototype.
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