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Reviving the TI-92 calculator into a RPI PC

We are re-engineering the old PCB board into a modern PCB for a simple swap. The goal is to get an up to date RPI computer

pcadicpcadic
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  • TI 92 Reviving project
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raspberry kicad lora

This project was created on 10/18/2020 and last updated a month ago.

Description

This project is trying to design a new modern PCB for the old TI92 calculator so a simple swap can be done . Doing this, you will get a fast RPI ZERO or a COMPUTE MODULE 3 PC + a high resolution 4 inch color display. The enclosure of this calculator gives a nice strong keyboard and plenty of internal space to add options: USB SD, Long range radio modules, sound etc ...The TI-92 calculators can be found easily on ebay.com at around 20-30 USD. The way they are built allows and very easy opening and components swaping. This project is made with Kicad, a bit of Solidworks. We need you help to speed up the process...

All source files are in our github directory (see link below).

Project Logs
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  • Hackster.io article

    pcadic • 10/27/2020 at 08:36 • 0 comments

    Hackster.io has published a detailed article about this mod.

    https://www.hackster.io/news/in-search-of-the-perfect-portable-pocket-terminal-sometimes-there-s-no-school-like-the-old-school-a20ef49d2082

  • Low power power switch

    pcadic • 10/22/2020 at 21:53 • 0 comments

    Preparing to add a very low power switch... 

  • XTP2046 & RPI install

    pcadic • 10/22/2020 at 21:14 • 0 comments

    I found the source to use the XTP2046 chip with the RPI PI ZERO

    The Datasheet is here 

  • Experimental schematic diag

    pcadic • 10/22/2020 at 21:09 • 0 comments

    I had to revert KICAD back from nightly build to stable and lost a pqart of the work because of file down compatibility issues. I had to redo the routing.

    Here is the first experimental schematic diagram (still some work to do).  Until I get a Compute module 3, I will use the RPI PI ZERO W computer.

    Next step tomorow

  • Voyage 200 board , similar

    pcadic • 10/21/2020 at 18:54 • 0 comments

    I also got the Voyage 200 model which replaced the TI92. All the work made with TI92 will speed up the conversion process  for the new model

  • Installing linux on the RPI PI ZERO W

    pcadic • 10/20/2020 at 20:15 • 0 comments

    Now trying to connect the 4 inch to the RPI PI ZERO . Looks like this tutorial will ease the process . Shows how to install ST7796s on raspbian. The website also offers pre-compiled images.

  • Keyboard footprint and connections are ok

    pcadic • 10/20/2020 at 19:54 • 0 comments

    I tried to route a bit... everything seems ok. There is much room to work with security and comfort.

    Before I finish the routing I have to finish the schematic with the RPI stuff.

    Time to read on how to drive the display with the RPI ZERO and RPI CM4 .

  • Footprint correction

    pcadic • 10/20/2020 at 15:31 • 0 comments

    oups, thanks to you for the comment

    There was a mistake in the buttons footprints

    I corrected the button mistake ... and updated the files

  • Current progress with KICAD

    pcadic • 10/20/2020 at 14:28 • 0 comments

    I've just updated the GITHUB directory with the latest kicad dev (please is the last nighly built of kicad to open the files)

    I added the buttons on the board.

    It is not time to work on the raspberry pi zero and  RPI Compute module 4 add. 

  • Conductive pads footprint for the keyboard

    pcadic • 10/18/2020 at 20:13 • 0 comments

    I've updated the github file Kbpad.kicad_mod which is a pcb gamepad footprint. Fortunately I've made them in the past for another project. They can be reused with no problem.

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Cees Meijer wrote 10/26/2020 at 20:52 • point

Just for fun, check out this page with  a beautiful mockup image of the TI92, which might even serve as an inspiration: http://androidarts.com/palette/Misc.htm

  Are you sure? yes | no

Jacob B wrote 10/22/2020 at 12:34 • point

Is the screen on the Voyage 200 identical to the screen on the TI92? I have a TI92 on the way but it does look like the voyage 200 is a slightly larger screen, or is that just an artifact of the photo angle?

  Are you sure? yes | no

pcadic wrote 10/22/2020 at 21:01 • point

I've not yet opened the voyage 200 to keep all my energy on the TI92 dev/ But at first glance, it is the same display. 

  Are you sure? yes | no

Jacob B wrote 10/22/2020 at 21:18 • point

Thanks, I have a ti92 on the way but haven't bought anything else until it gets here. But if it would require opening to know that suggests the Voyage isn't significantly larger if it is larger at all, so that pretty much answer my questions right there.

  Are you sure? yes | no

feiltom wrote 10/21/2020 at 12:17 • point

Very good idea !, I buy TI92 and the LCD this morning.  

  Are you sure? yes | no

Jacob B wrote 10/20/2020 at 19:02 • point

Am very interested in this project. I was playing around with the thought of shoving a pi4 into a nspire, a little more incognito, but this also looks very interesting.
<strike>Is the plan to find a touchscreen for mouse input, or maybe use the upper right hand pads to create mouse input?</strike>
Ahh, nevermind, touchscreen.

  Are you sure? yes | no

Pavel Brychta wrote 10/20/2020 at 15:09 • point

Please check your 6mm pad footprint - there is short circuit between P1 and P2 (second vertical trace from right on lower half)..

  Are you sure? yes | no

pcadic wrote 10/20/2020 at 15:19 • point

Thanks for the remark.  ahhhhhh correcting

  Are you sure? yes | no

Dan Maloney wrote 10/19/2020 at 21:15 • point

The donor calculator seems to offer a lot of space to work within. Looking forward to seeing what you come up with.

  Are you sure? yes | no

Cees Meijer wrote 10/19/2020 at 15:17 • point

Awesome! And these calculators are indeed very cheap on ebay, so I definitely consider making one as well.

  Are you sure? yes | no

pcadic wrote 10/19/2020 at 15:22 • point

yes. They were also widely distributed ... :)

  Are you sure? yes | no

Cees Meijer wrote 10/19/2020 at 19:16 • point

Well, I never saw one before, but I suppose that's an age thing. Every generation has it's own calculator :-)

  Are you sure? yes | no

pcadic wrote 10/19/2020 at 19:43 • point

yes. They are rather old. I remember using it with RAMSES II in class :)

  Are you sure? yes | no

Richard Hogben wrote 10/19/2020 at 14:28 • point

TI-92 memories...

  Are you sure? yes | no

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