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Line 7: IBM had demonstrated use of a mainframe instruction set in their first desktop computer—the [[IBM 5100]], released in 1975. This product used microcode to execute many of the [[System/370]]'s processor instructions, so that it could run a slightly modified version of IBM's [[APL (programming language)\|APL]] mainframe program interpreter. In 1980 rumors spread of a new IBM personal computer, perhaps a miniaturized version of the ~~[[IBM System/~~370]].<ref name="byte198101">{{cite news \| url=https://archive.org/stream/byte-magazine-1981-01/1981_01_BYTE_06-01_Hand-held_Computers#page/n313/mode/2up \| title=Interest Group for Possible IBM Computer \| work=BYTE \| date=January 1981 \| accessdate=18 October 2013 \| pages=313}}</ref> In 1981 the [[IBM Personal Computer]] appeared, but it was not based on the System 370 architecture. However, IBM did use their new PC platform to create some exotic combinations with additional hardware that could execute S/370 instructions locally. ===Personal Computer XT/370===

PC-based IBM mainframe-compatible systems: Difference between revisions