BCC 500

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BCC 500

The BCC 500 was a computer made by the Berkeley Computer Corporation. When the company went bankrupt, the prototype went to Hawaii and was successfully deployed as an ARPANET host. It was also the hub of the ALOHA network which inspired Ethernet.

BCC was formed by members from Berkeley's Project Genie, where they made hardware and software for creating the BTSS timesharing system running on an SDS 930, eventually resulting in SDS offering the 940 as a product. When the BCC offices closed, the staff went on to Xerox PARC where they created first the MAXC and later the Alto.

The computer consists of six independent microcoded processors, having a 24-bit word width, 18-bit addressing, and access to a shared memory. The microcode implements a machine code with a 6-bit opcode and 18-bit address field. Two of the processors have expanded hardware capabilities and run user code. The other four are each responsible for implementing their own part of the operating system; part in microcode and part in macrocode.

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