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== Languages: APL and BASIC == The 5100 supports two programming environments โ APL (the original target language) and BASIC (added for broader market appeal). Both run as the '''operating environment''': there is no separate operating system. The language is selected at power-on via a front-panel toggle on dual-language machines. '''APL''' on the 5100 is APLSV โ IBM's System/370 APL implementation โ slightly modified for the 5100. The PALM microcode emulates the System/370 instruction subset needed to run the APLSV object code without porting it.<ref>https://en.wikipedia.org/wiki/IBM_5100</ref> '''BASIC''' on the 5100 is a port of IBM's System/3 BASIC.
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