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Alpha AXP

Alpha
Designer Digital Equipment Corporation
Bits 64-bit
Introduced 1992
Design RISC
Type Register-Register
Encoding Fixed
Endianness Bi
Extensions Byte/Word Extension (BWX), Square-root and Floating-point Convert Extension (FIX), Count Extension (CIX), Motion Video Instructions (MVI)
Open Yes
Registers
General purpose 31 plus always-zero R31
Floating point 31 plus always-0.0 F31
DEC Alpha registers
63 . . . 47 . . . 31 . . . 15 . . . 01 00 (bit position)
General-purpose registers
R0 R0
R1 R1
R2 R2
 
 
 
R29 R29
R30 R30
           R31 (zero) R31, always zero
Floating-point registers
F0 F0
F1 F1
F2 F2
 
 
 
F29 F29
F30 F30
           F31 (zero) F31, always zero
Program counter
         PC 0 0 Program Counter
Control registers
LR0 Lock Register 0
LR1 Lock Register 1
FPCR FP Control Register

Alpha, originally known as Alpha AXP, is a 64-bit reduced instruction set computing (RISC) instruction set developed by Digital Equipment Corporation (DEC), designed to replace their 32-bit VAX complex instruction set computer (CISC) instruction set. Alpha was implemented in microprocessors originally developed and fabricated by DEC. These microprocessors were most prominently used in a variety of DEC workstations and servers, which eventually formed the basis for almost all of their mid-to-upper-scale lineup. Several third-party vendors also produced Alpha systems, including PC form factor motherboards.

Operating systems that supported Alpha included OpenVMS (previously known as OpenVMS AXP), Tru64 UNIX (previously known as DEC OSF/1 AXP and Digital UNIX), Windows NT (discontinued after NT 4.0; and pre-release Windows 2000 RC1),Linux (Debian, SUSE,Gentoo and Red Hat), BSD UNIX (NetBSD, OpenBSD and FreeBSD up to 6.x), Plan 9 from Bell Labs, as well as the L4Ka::Pistachio kernel.


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