A: Manhattan, New York, New York, United States
On August 12, 1981 IBM introduced their open architecture personal computer (PC) based on the Intel 8088 processor. The IBM PC ran PC-DOS, the IBM-branded version of the 16-bit operating system, MS-DOS, provided by Microsoft. The machine was originally designated as the IBM 5150, putting it in the "5100" series, though its architecture was not directly descended from the IBM 5100.
On August 17, 1981 a review of the IBM PC appeared on USENET (accessed 10-16-2009).