VAX

VAX

Designer	Digital Equipment Corporation
Bits	32-bit
Introduced	1977; 47 years ago (1977)
Design	CISC
Type	Register–register Register–memory Memory–memory
Encoding	Variable (1 to 56 bytes)
Branching	Condition code
Endianness	Little
Page size	512 bytes
Extensions	PDP-11 compatibility mode, VAX Vector Extensions,[1] VAX Virtualization Extensions[2]
Open	No
Predecessor	PDP-11
Successor	Alpha
Registers
General-purpose	16 × 32-bit
Floating point	not present, uses the GPR
Vector	16 × 4096-bit (64 elements of 64 bits each)

VAX (an acronym for Virtual Address eXtension) is a series of computers featuring a 32-bit instruction set architecture (ISA) and virtual memory that was developed and sold by Digital Equipment Corporation (DEC) in the late 20th century. The VAX-11/780, introduced October 25, 1977, was the first of a range of popular and influential computers implementing the VAX ISA. The VAX family was a huge success for DEC, with the last members arriving in the early 1990s. The VAX was succeeded by the DEC Alpha, which included several features from VAX machines to make porting from the VAX easier.

VAX was designed as a successor to the 16-bit PDP-11, one of the most successful minicomputers in history with approximately 600,000 units sold. The system was designed to offer backward compatibility with the PDP-11 while extending the memory to a full 32-bit implementation and adding demand paged virtual memory. 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) design.

DEC quickly dropped the −11 branding as PDP-11 compatibility was no longer a major concern. The line expanded to both high-end mainframes like the VAX 9000 as well as to the workstation-scale systems like the VAXstation series. The VAX family ultimately contained ten distinct designs and over 100 individual models in total. All of them were compatible with each other and normally ran the VAX/VMS operating system.

VAX has been perceived as the quintessential CISC ISA,^[3] with its very large number of assembly language programmer-friendly addressing modes and machine instructions, highly orthogonal instruction set architecture, and instructions for complex operations such as queue insertion or deletion, number formatting, and polynomial evaluation.^[4]