Editing ELF II (section)

==Notable Features==
* Unlike similar "bare circuit card" trainer/experimenter computers of the day, the ELF II could be easily expanded thanks to its built-in [[Bus (computing)|bus]].
* Memory mapped TV graphics was provided in the base kit by the [[RCA CDP1861|CDP1861]] "Pixie-Graphics" chip. Pixels were large. With unexpanded 256 byte memory, the [[interrupt]] routine needed to service the chip showed on the screen.
* The "Full BASIC" ROM card provided an [[Reverse Polish notation|RPN]] calculator chip as a simple and low-cost [[math coprocessor]].  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 (see code example below). 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.<syntaxhighlight lang="Qbasic">
10 REM This program will print the number 30
20 A=10,B=20
30 C=A#B+
40 PRINT C
50 END
</syntaxhighlight> In the code above, the "#" symbol is equivalent to the "Enter" key on a RPN calculator.