ELF II

The Netronics ELF II was an early microcomputer trainer kit featuring the RCA 1802 microprocessor, 256 bytes of RAM, DMA-based bitmap graphics, hexadecimal keypad, two digit hexadecimal LED display, a single "Q" LED, and 5 expansion slots. The system was developed and sold by Netronics Research and Development Limited in New Milford, CT, USA.
Hardware.
Available hardware accessories included:
Software.
Available software included:
Notable Innovations.
10 REM This program will print the number 30
20 A=10,B=20
30 C=A#B+
40 PRINT C
50 END
In the code above, the "#" symbol is equivalent to the "Enter" key on a RPN calculator.
The Name.
The ELF part of the name came from an earlier machine called the "COSMAC ELF", published as a construction project in Popular Electronics magazine. Improvements on its predecessor included an etched PCB, a hexadecimal keypad instead of toggle switches for program entry, the CDP1861 Pixie-graphics chip, and the 5 slot 86-line bus for expansion cards.