The first normal looking drum machine Roland TR-808 Rhythm Composer was also one of the first programmable drum machines at the time. Introduced by the Roland Corporation in early 1980, it was originally manufactured for use as a tool for studio musicians to create demos. Like earlier Roland drum machines, it does not sound very much like a real drum kit.
Drum machines in general became an integral part of rap music as a cheap and simple way of producing a drum sound. The Roland TR-808 held specific appeal because of the ability of its bass drum sound to produce extremely low-frequency sounds. It's 100% analogue and is still proclaimed to having the best clap. It's also very famous for it's good marracas sounds.