The VAX-11 is a discontinued family of 32-bit superminicomputers, running the Virtual Address eXtension (VAX) instruction set architecture (ISA), developed and manufactured by Digital Equipment Corporation (DEC). Development began in 1976.

2020年9月15日 · 1978年，DEC推出了PDP-11的虚拟地址扩展VirtrualAddressExtension计算机VAX-11[17]。VAX-11的地址总线有32位，为了保证市场的平稳过渡，早期的VAX-11计算机使用兼容模式运行16位程序，但是性能上要比新的32位地址程序慢。

The name VAX refers to its virtual address extension concept that allowed programs to make use of this newly available memory while still being compatible with unmodified user mode PDP-11 code. The name "VAX-11", used on early models, was chosen to highlight this capability. The VAX ISA is considered a complex instruction set computer (CISC ...

The VAX-11/780 was the first member to ship of the VAX family of larger computers. The VAX series was conceived as the successor to the successful PDP-11 series of minicomputers ; in order to make the VAX seem more PDP-11 friendly, they retained the -11 moniker for the first VAXen, and provided the ability to execute PDP-11 object code - hence ...

VAX是Virtual Address eXtension的簡稱。 主要因其為 16位 的 PDP-11 擴展版本，及較早應用虛擬內存管理地址空間而命名。 早期的VAX處理器同時可以兼容PDP-11的指令。

VAX是Virtual Address eXtension的簡稱。主要因其為16位的PDP-11擴展版本，及較早應用虛擬内存管理地址空間而命名。 早期的VAX處理器同時可以兼容PDP-11的指令。甚至事實上有時會被叫做VAX-11，以彰顯其與PDP-11的淵源和兼容性。

2013年3月7日 · vax-11/780中的同步底板互联总线（sbi）是该系统的数据通路脊梁。通过sbi，cpu和i/o系统能够直接访问内存，实现了速度和效率的显著提升。sbi不仅服务于标准的i/o设备，而且能够连接到更高速的i/o设备。

The VAX line of 32-bit “super-minicomputers” rivaled much more expensive mainframe computers. Its success made DEC the second-largest company in the industry. VAX, a “complex instruction set computer,” was widely cloned in Eastern Europe.</p>

In addition, while we have become accus- tomed to single chip microprocessors with mini- mal interfaces to probe their internal operations, the VAX 11/780 CPU spanned about 20 boards. One such board was the microcode store, which directed much of the behavior of the machine.

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.