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VAX-11
The VAX-11 was a family of minicomputers developed and manufactured by Digital Equipment Corporation (DEC) using processors implementing the VAX instruction set architecture (ISA). The VAX-11/780 was the first VAX computer.
== VAX-11/780 ==
The VAX-11/780, code-named "Star", was introduced on 25 October 1977 at DEC's Annual Meeting of Shareholders.〔Digital Equipment Corporation. ''VAX OpenVMS at 20''.〕 It was the first computer to implement the VAX architecture. The VAX-11/780 central processing unit (CPU) was built from transistor-transistor logic (TTL) devices and had a 200 ns cycle time (5 MHz) and a 2 kB cache. Memory and I/O were accessed via the Synchronous Backplane Interconnect (SBI).
The VAX-11/780 supported 128 kB to 8 MB of memory (2 MB initially) through one or two memory controllers. Each memory controller supported 128 kB to 4 MB of memory. The memory was constructed from 4 or 16 kbit metal oxide semiconductor (MOS) RAM chips mounted on memory array cards. Each memory controller controlled up to 16 array cards. The memory was protected by error correcting code (ECC).
The VAX-11/780 used the Unibus and Massbus for I/O. Unibus was used for attaching peripherals and Massbus for disk and tape drives. Both buses were provided by adapters that interfaced the bus to the SBI. All systems came with one Unibus as standard, with up to four supported. Massbus was optional, with up to four supported. The VAX-11/780 also supported Computer Interconnect (CI), a proprietary network to attach disk drives and potentially share them with other VAX computers. Later, this feature was used to connect VAX computers in a VMScluster.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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