> The ITRON specs can be downloaded from the TRON website

I had seen that, but many things (including many of the older stuff) seems to be missing.

However, some stuff I had found elsewhere (not from TRON website), and I had been able to partially figure out from the Japanese documentation and had been able to write a program that can partially parse the TRON Application Databus format. However, many things I could not figure out very well.

I had also found what seems to be some document of TRON instruction set (I have some interest in the instruction sets of some older computers, not only TRON), but is Japanese and also seems that some files are missing, anyways. So, I don't know its working anyways. (I also found some English documentation but it does not actually explain much, although there is a few minor explanation of them.)

> CTRON appears to have been based on OSI-I see references to FTAM and MOTIS (the X.400 mail transport protocol)

However, I think X.400 uses ASN.1, and ASN.1 does not have a TRON string data type (I had once also wanted to use this in something else (unrelated to X.400 mail and CTRON), so I used the octet string type instead).

> I can’t find any references to actual specs for MTRON. I am wondering if it was ever actually specified, or if it was just vapourware

That was my guess as well, but I don't know either.

> You don’t need a whole operating system for that. It could just be a library which supported converting TRON code to other character sets, displaying text in TRON code, etc.

You are right, I do not need a whole operating system for that (see below). But, the operating system design is helpful for many other things. The use of TRON character code is only one of its features; it also has many other features, many of which are difference from POSIX and other systems (although some things are similar to other systems). (I had written elsewhere about my ideas of operating system designs, too.)

I had done some of the other stuff relating to TRON code in Linux too (although it is incomplete). I have written some programs that can display text, I had made fonts with TRON character set (although not all planes are implemented), and some programs that can convert some character codes (including e.g. EUC-JP, EUC-CN, EUC-KR). I had also been able to write partial English documentation from what I could figure out (which I documented on Just Solve The File Format Problem Wiki), although much of it is difficult.

(One of the problems I have is the way the GT fonts are coded; they are several TrueType fonts, that use an improper Unicode mapping that does not seem to have anything to do with the actual Unicode characters that those numbers are supposed to correspond to (except font 1, which does correspond correctly to Unicode), and the mapping of improper Unicode into TRON code is given in a large PDF file, and the mapping seems to not have any sort of reasonable order, and that I could not figure out how to handle automatically. If I could figure out how to handle it properly then I could implement a file that can use them with the TRON code directly; someone who is Japanese and is able to compare the characters to figure out how to make up your own bitmap fonts with the GT character set, could do that too, I suppose.)