Everything is fine, as long as we don’t give up, we will eventually reach all doable goals.
It is JavaScript based, correct. As a user, you just press the buttons on ITTS.js 0.0.2 (pushed a minor update), they do the exact same thing as the ITTS boxes in demo mod If the black area did not show up in the 0.0.1 version for you, it was not your fault but a bug.
Dynamic loading of ITTS packets is not yet supported, I have a good idea how the mapping to the different button, overwriting just a single line and so on works but I want to wait for ITTS packets from tape to be sure.
I think it is too early to write a simplified technical guide, my source won’t help much either for many reasons. If you have any question on that IEC (not ISO) standard, I do think that I have a fairly solid variety of understanding of it now and could feel the pain that it caused which may be one reason for the lack of real implementations outside of the ITTS box for myself.
Please keep in mind for further discussion, this is supposed to be the hardware thread, here is the display/software part: ITTS (DCC text) reimplementation