Had an associate that, through a fluke, (timing) became a serviceman in his building of the orignal IBM PC. He insisted that the orignal came with *4KB* of RAM and as a pricey option, 16KB.

With two full-height floppy drives, (180KB ea.) you could run "VisiCalc." Wordstar was orinally offered for the pre-DOS "CP/M" operating system.