High Quality Content by WIKIPEDIA articles! The Netronics ELF II was an early microcomputer trainer kit introduced about 1977 featuring an RCA 1802 microprocessor, 256 bytes of RAM, 0 bytes of ROM, DMA based bit mapped graphics, hex keypad for user interaction and DMA based program loading, a two digit hexadecimal LED display, an LED on the special processor Q line, and 5 expansion slots, an LED on the special processor Q line, and 5 expansion slots.