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: Available software included: Tiny BASIC Text Editor Full BASICNotable Innovations Unlike similar "bare circuit card" trainer/experimenter computers of the day , the ELF II could be easily expanded thanks to its built-in bus. The video card is mounted underneath the keyboard inside the metal case. This allows it to be used as a standalone computer terminal if needed. The Elf II used a simple and low-cost math coprocessor . The "Full BASIC" ROM card contained an RPN calculator chip. As a result, floating point operations were an order of magnitude faster than what was possible in software. However, the BASIC syntax for math was non-standard as it used postfix RPN . Historically, this was also the heyday of Hewlett Packard calculators , so it was a fair bet that any technically minded person willing to assemble a computer either already knew RPN or could easily learn it and adapt. 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 .
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