The Motorola 6800 was designed beginning in 1971 and released in 1974. In overall design terms, it has a strong resemblance to other CPUs that were designed from the start as 8-bit designs, like the Intel 8080. It was initially fabricated using early NMOS logic, which normally required several different power supply voltages. A key feature was an on-chip voltage doubler allowed it to run on a single +5V supply, a major advantage over its competitors like the Intel 8080 which required -5, +5, -12 and ground. It was fabricated using the then-current contact lithography process, which led to the vast majority of the resulting chips being unusable and leading to high prices.