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Get on the Bus: Data Busses Used in Macs, 1984 to 2000 – Low End Mac
A lot has changed since the first Macintosh. Apple no longer uses a phone connector for its keyboard or DE-9 serial ports for its mouse, printer, and modem.
Apple chose to use the Zilog 8530 chip to manage serial communication; speed was controlled using an external clock signal and could go as high as 1 Mbps. The GeoPort Telecom Adapter initially supported modem speeds to 9600 bps but over time was updated through software to reach 33.6 kbps. Going ATA was a cost saving factor that let Apple offer a PowerBook for as little as US$1,450, although PB 150 users will warn you that it has a horrid passive matrix 2-bit grayscale display.
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