AKA Gold Star Electronics FC-150 (Famicom-150).
The stdio library has been tested with the “Integer BASIC” cartridge extension.
zcc +m5 -lm -create-app -Cz--audio program.c
This will create both a 'CAS' and a WAV file, for emulators or the real hardware. To load and run the program use the SORD BASIC 'TAPE' command.
zcc +m5 -lm -zorg 29696 program.c
This will create a binary file.
To upload something on the emulator use the “inject utility” from the /support/generic folder.