You can developp very freely, even the RST vectors are free usable. Also the second register set of the Z80 is freely usable.
*''Z80 Assembler:'' You can use an assembler for AmsDOS or for CP/M. Switching between AmsDOS and FutureOS is fast and using |FDESK allows to come back to AmsDOS with the first 48 KB or RAM remaining untouched. There is a Z80 library for FutureOS the programmer can use for own applications. In addition [[CBM]] can make applicatioin developpment easy and quick.
*''Programming in C for FutureOS:'' With [[FIOLIB|FIOLIB]] - the IO-Lib for FutuerOS it 's also possible to use C as a programming language. Beside the usual I/O the FIOLIB provides a lot of valuable functions for management of text, keyboard, files, relative files, screen, colors, grafix and more.
== Applications / Demos / Games ==