In 1981, IBM introduced the PC personal computer for $1,600 base price. It shortly eliminated most other machines suitable for home or small business such as those with the S-100 bus, running on CP/M or their own operating system. The PC was developed in less than a year at IBM's Boca Raton Florida facility by using existing off-the-shelf components. The IBM-PC established the dominance of the Microsoft operating system. The IBM PC hardware design also became the industry standard for PC compatibles, with the ISA bus. Its Intel 8080 processor speed was 4.77 MHz, and it used from 16K up to 640K of memory. Data storage choices included 5.25" floppy drives, cassette tape, and later hard disks.«