The IBM Personal Computer (model 5150, commonly known as the IBM PC) is the first microcomputer released in the IBM PC model line and the basis for the IBM PC compatible de facto standard. Released on August 12, 1981
— https://en.wikipedia.org/wiki/IBM_Personal_Computer
IBM took the unusual approach of offering two different graphics options, the MDA and CGA cards
The software and hardware of the PC, at release, was designed around a single 8-bit adaptation of the ASCII character set, now known as code page 437.
— https://en.wikipedia.org/wiki/IBM_Personal_Computer#Display