@Truck @neauoire
Development-wise, here are some resources for the #MSX:

#FusionC, a #C Library for #SDCC can compile #MSXDOS commands: https://www.msx.org/wiki/Fusion-C and http://www.ebsoft.fr/shop/en/19-fusion-c and support via https://www.msx.org/forum/msx-talk/development/msx-fusion-c-talking-about-bugs-errors-mistakes

#TurboPascal: https://www.msx.org/wiki/MCCE_Turbo_Pascal

MSX #Z80 Assembler basics: https://www.msx.org/wiki/Assembler_for_Dummies_(Z80)

(Cross-)Assemblers:
#Sjasm: http://www.xl2s.tk/
#tniASM: http://www.tni.nl/products/tniasm.html
#MSXGlass: http://www.grauw.nl/projects/glass/
#asMSX: https://symsx.github.io/asMSX/man/asmsx-en.html