In order to support expansion for high-end systems, similar to the card slots used in the Apple II or S-100 machines, the 1000 series also supported the Parallel Bus Interface (PBI), a single expansion slot on the back of the machine.
The Sorcerer was a modified S-100 bus based machine, but lacked the internal expansion system common to other S-100 systems.
The backplane was split into four separate cards, with the CPU on a fifth.
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IBM introduced the IBM Personal Computer in 1981 and followed it with increasingly capable models: the XT in 1983 and the AT in 1984.
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