CAS on Casio vs HP?

[jebem]

(05-10-2014 10:04 PM)eried Wrote:  Curious thing is that Algebra FX2.0 runs something like DOS-exes, every icon is and independent exe file. I struggled a lot in the FX2 due the lack of strings, so I remember using arrays with custom printing routines from the screen to handle "vars" with strings.

If the Wikipedia can be of any value, it is suggested there that "There are community written tools for accessing the ROM-DOS operating system thus allowing C and Pascal compilers to be used".
ROM-DOS was popular on embedded systems some years ago to run on Intel 80186 compatible processors, so this Casio AFX 2.0 Plus is of some interest to explore.
In fact the other day I was browsing around in the AFX features and I got myself into a DOS Prompt (something like C:>) and after a reset I couldn't duplicate the situation again...
I got mine just one year ago because it was such a low price that I couldn't resist, but I had no opportunity to explore it so far.