The 8051's predecessor, the 8048, was used in the keyboard of the first IBM PC, where it converted keypresses into the serial data stream which is sent to the main unit of the computer.
Pendahulu 8051, Intel 8048, digunakan dalam keyboard pertama PC IBM, di mana dia mengubah tekanan kunci menjadi sebuah aliran data serial yang dikirimkan ke unit utama komputer.