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@@ -8,11 +8,24 @@ screen. With a tiny font, the best we can get is a 24x10 console. |
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There is, however, a built-in USB controller that might prove very handy. |
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[Further reading](../../doc/ti8x.md) |
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I haven't opened one up yet, but apparently, they have limited scavenging value |
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because its z80 CPU is packaged in a TI-specific chip. Due to its sturdy design, |
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and its ample RAM and flash, we could imagine it becoming a valuable piece of |
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equipment if found intact. |
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The best pre-collapse ressource about it is |
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[WikiTI](http://wikiti.brandonw.net/index.php). |
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As it is now, with its tiny screen and cumbersome keyboard, Collapse OS is |
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not really usable on the TI-84+. One could imagine a scenario where one has a |
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terminal and uses the TI-84+ through the link for its large amount of flash and |
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RAM. But using it standalone? Nah, not even post-collapse. |
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Therefore, this recipe is more of a "look, I run!" demo. |
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## Recipe |
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This recipe gets the Collapse OS BASIC shell to run on the TI-84+, using its LCD |
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This recipe gets the Collapse OS interpreter to run on the TI-84+, using its LCD |
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screen as output and its builtin keyboard as input. |
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## Gathering parts |
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@@ -25,7 +38,7 @@ screen as output and its builtin keyboard as input. |
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## Build the ROM |
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Running `make` will result in `os.rom` being created. |
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Running `make` will result in `stage1.rom` being created. |
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## Emulate |
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@@ -38,6 +51,30 @@ Collapse OS prompt will appear. See `emul/hw/ti/README.md` for details. |
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## Upload to the calculator |
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### Background notes |
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Getting software to run on it is a bit tricky because it needs to be signed |
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with TI-issued private keys. Those keys have long been found and are included |
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in `keys/`. With the help of the |
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[mktiupgrade](https://github.com/KnightOS/mktiupgrade), an upgrade file can be |
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prepared and then sent through the USB port with the help of |
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[tilp](http://lpg.ticalc.org/prj_tilp/). |
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That, however, requires a modern computing environment. As of now, there is no |
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way of installing Collapse OS on a TI-8X+ calculator from another Collapse OS |
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system. |
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Because it is not on the roadmap to implement complex cryptography in Collapse |
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OS, the plan is to build a series of pre-signed bootloader images. The |
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bootloader would then receive data through either the Link jack or the USB port |
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and write that to flash (I haven't verified that yet, but I hope that data |
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written to flash this way isn't verified cryptographically by the calculator). |
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As modern computing fades away, those pre-signed binaries would become opaque, |
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but at least, would allow bootstrapping from post-modern computers. |
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### Instructions |
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**WARNING: the instructions below will wipe all the contents of your calculator, |
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including TI-OS.** |
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