Software
A series of newsletters and small booklets offered by Netronics and Quest contained 1802 machine language and CHIP-8 programs, along with schematics for expanding the ELF and adding peripherals, including a light pen.
Tiny BASIC, a version of BASIC offered by Tom Pittman, could be used to write small BASIC programs on the ELF that could display through the PIXIE display or TV-Typewriter hardware.
Mike Riley has written an editor, assembler, BASIC and FORTH interpreters, a BIOS, and the Elf/OS disk operating system that will run on expanded ELF systems, including the COSMAC Elf 2000.
Read more about this topic: COSMAC ELF