 This led to noisy signals as they all shared a common ground, a topic of considerable derision by many users.When the bus was extended into a 50-pin ribbon cable, the resulting signals were too noisy, and Marsh demanded that there be additional ground pins spread across the cable to reduce this noise.The Sol solved this problem by supporting only one of the two data busses at a time, allowing input or output and switching between them by signaling with the codice_1 pin on the 8080.