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The initial default hardware implementation for AppleTalk was a high-speed serial protocol known as LocalTalk that used the Macintosh's built-in RS-422 ports at 230. 4 kbit / s.
LocalTalk used a splitter box in the RS-422 port to provide an upstream and downstream cable from a single port.
The topology was a bus: cables were daisy-chained from each connected machine to the next, up to the maximum of 32 permitted on any LocalTalk segment.
The system was slow by today's standards, but at the time the additional cost and complexity of networking on PC machines was such that it was common that Macs were the only networked personal computers in an office.
Other larger computers, such as UNIX or VAX workstations, would commonly be networked via Ethernet.

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