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doc: add TI83+/TI84+ doc page

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Virgil Dupras 2019-12-02 13:51:36 -05:00
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* [Using block devices](blockdev.md)
* [Using the filesystem](fs.md)
* [Assembling z80 source from the shell](zasm.md)
## Hardware
Some consolidated documentation about various hardware supported by Collapse OS.
Most of that information can already be found elsewhere, but the goal is to have
the most vital documentation in one single place.
* [TI-83+/TI-84+](ti8x.md)

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# TI-83+/TI-84+
Texas Instruments is well known for its calculators. Among those, two models
are particularly interesting to us because they have a z80 CPU: the TI-83+ and
TI-84+ (the "+" is important).
They lack accessible I/O ports, but they have plenty of flash and RAM. Collapse
OS runs on it (see `recipes/ti84`).
I haven't opened one up yet, but apparently, they have limited scavenging value
because its z80 CPU is packaged in a TI-specific chip. Due to its sturdy design,
and its ample RAM and flash, we could imagine it becoming a valuable piece of
equipment if found intact.
The best pre-collapse ressource about it is
[WikiTI](http://wikiti.brandonw.net/index.php).
## Getting software on it
Getting software to run on it is a bit tricky because it needs to be signed
with TI-issued private keys. Those keys have long been found and are included
in `recipes/ti84`. With the help of the
[mktiupgrade](https://github.com/KnightOS/mktiupgrade), an upgrade file can be
prepared and then sent through the USB port with the help of
[tilp](http://lpg.ticalc.org/prj_tilp/).
That, however, requires a modern computing environment. As of now, there is no
way of installing Collapse OS on a TI-8X+ calculator from another Collapse OS
system.
Because it is not on the roadmap to implement complex cryptography in Collapse
OS, the plan is to build a series of pre-signed bootloader images. The
bootloader would then receive data through either the Link jack or the USB port
and write that to flash (I haven't verified that yet, but I hope that data
written to flash this way isn't verified cryptographically by the calculator).
As modern computing fades away, those pre-signed binaries would become opaque,
but at least, would allow bootstrapping from post-modern computers.

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There is, however, a built-in USB controller that might prove very handy.
[Further reading](../../doc/ti8x.md)
## Recipe
This recipe gets the Collapse OS BASIC shell to run on the TI-84+, using its LCD