Editing AppleTalk (section)

===AppleBus===
Through this period, Apple was deep in development of the Macintosh computer. During development, engineers had made the decision to use the [[Zilog SCC|Zilog 8530]] serial controller chip (SCC) instead of the lower-cost and more common [[UART]] to provide [[serial port]] connections.{{sfn|Oppenheimer|2004|loc=Slide 6}} The SCC cost about $5 more than a UART, but offered much higher speeds of up to 250&nbsp;kilobits per second (or higher with additional hardware) and internally supported a number of basic networking-like protocols like IBM's [[Binary Synchronous Communications|Bisync]].<ref>{{cite book |url=http://html.alldatasheet.net/html-pdf/96934/ZILOG/Z8530/1414/11/Z8530.html |title=Zilog Z8530 User's Manual |publisher=[[Zilog]] |page=1{{hyp}}1}}</ref>

The SCC was chosen because it would allow multiple devices to be attached to the port. [[Peripheral]]s equipped with similar SCCs could communicate using the built-in protocols, interleaving their data with other peripherals on the same bus. This would eliminate the need for more ports on the back of the machine, and allowed for the elimination of [[expansion slot]]s for supporting more complex devices. The initial concept was known as '''AppleBus''', envisioning a system controlled by the host Macintosh polling "dumb" devices in a fashion similar to the modern [[Universal Serial Bus]].{{sfn|Oppenheimer|2004|loc=Slide 9}}