NOTE: I am not a software programmer.
A case study on how to implement an I2C interface for the TI-92+ (and may be others too).
Due to the circuit inside the calculator, I2C equipment can be directly connected to your 2.5mm jack.
Unfortunately I lost some newer source files during a power supply burnout, this is all I could recover...
I used TIGCC for this, just download, install and build the project.
Mhh, I guess it should be clear on how to write a TI basic application using the I2C routines, right?
Right place and time for an useless pic...
As usual: no docs, no warranty, no support.