Developer's guide

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Applications are stored as a collection of files and folders within a folder in a top-level folder called PROGRAMS. Application names can be any length and contain any valid FAT-32 filename character (including space). In SE BASIC, applications are launched with !MY APP NAME or RUN "MY APP NAME". The application name is truncated to derive the folder and binary filenames and spaces are converted to underscores.

PROGRAMS
|----------- MY_APP_N.AME
             |----------- PRG
                          |----------- MY_APP_N.PRG
                          RSC
                          |----------- RESOURCE.BIN

The RUN command sets the stack pointer to $6000, loads the binary (PRG file) at $6000, changes the path to the resource (RSC) folder and sets the program counter to $6000.

If the binary fails to load it restores the stack and falls back to BASIC. This means the binary can be up to 40K in length. The binary is then responsible for loading its own resources. The method for passing parameters to the app is to define a variable in BASIC.

This approach has a number of advantages over the single executable file method. For example, with multi-lingual software, only the selected language resources need to be loaded. It is also easy to customize the app without the need to recompile it.

Apps can use SEOS system calls to perform common tasks that would ordinarily require boiler-plate code.

Apps can also make use of the internal software floating point unit using the X80 instruciton set.