DEC AlphaStation 255

The AlphaStation 255 used DEC's Alpha AXP processor, a 64-bit RISC architecture that DEC developed as a successor to its VAX line. The Alpha architecture was notable for its high clock speeds and 64-bit addressing at a time when most competitors still used 32-bit designs. Compaq later acquired DEC and eventually the Alpha architecture was phased out in favor of Intel Itanium.

The AlphaStation 255 primarily ran DEC's OpenVMS and Windows NT for Alpha AXP, along with UNIX variants such as DEC OSF/1 which was later renamed Tru64 UNIX. Some users also ran Linux distributions ported to the Alpha architecture. The choice of operating system depended on whether the workstation was used for engineering, scientific, or general computing tasks.

The AlphaStation 255 is obsolete vintage hardware with performance far below any modern system, making it impractical for contemporary computing tasks. It is primarily of interest to retro computing enthusiasts, collectors, and museums preserving DEC-era computing history. Some hobbyists run legacy OpenVMS or Tru64 UNIX environments on preserved hardware for historical exploration.

The Alpha AXP was a pure 64-bit RISC design that often outperformed contemporary Intel x86 processors in floating-point and compute-intensive workloads, which is why DEC targeted the scientific and engineering workstation markets. However, Intel's x86 ecosystem had overwhelming software compatibility advantages and lower cost, which eventually marginalized Alpha. The architecture's influence persisted in areas like 64-bit design concepts.