By early 1981 the Mac team had grown to about twenty, and Jobs decided that they should have bigger quarters. So he moved everyone to the second floor of a brown-shingled, two-story building about three blocks from Apple’s main offices. It was next to a Texaco station and thus became known as
Texaco Towers. In order to make the office more lively, he told the team to buy a stereo system. “Burrell and I ran out and bought a silver, cassette-based boom box right away, before he could change his mind,” recalled Hertzfeld.
a long-distance call to go through without extra charges. The article revealed that other tones that
served to route calls could be found in an issue of the Bell System Technical Journal, which AT&T
immediately began asking libraries to pull from their shelves.
As soon as Jobs got the call from Wozniak that Sunday afternoon, he knew they would have to get
their hands on the technical journal right away. “Woz picked me up a few minutes later, and we went
to the library at SLAC [the Stanford Linear Accelerator Center] to see if we could find it,” Jobs recounted.
It was Sunday and the library was closed, but they knew how to get in through a door that was rarely locked.
“I remember that we were furiously digging through the stacks, and it was Woz who finally found the journal
with all the frequencies. It was like, holy shit, and we opened it and there it was. We kept saying to ourselves,
‘It’s real. Holy shit, it’s real.’ It was all laid out—the tones, the frequencies.”
Wozniak went to Sunnyvale Electronics before it closed that evening and bought the parts to make
an analog tone generator. Jobs had built a frequency counter when he was part of the HP Explorers
Club, and they used it to calibrate the desired tones. With a dial, they could replicate and tape-record
the sounds specified in the article. By midnight they were ready to test it. Unfortunately the oscillators
they used were not quite stable enough to replicate the right chirps to fool the phone company.
“We could see the instability using Steve’s frequency counter,” recalled Wozniak, “and we just
couldn’t make it work. I had to leave for Berkeley
the next morning, so we
decided I would work
on building a digital
version once I got there.”