Template:Infobox CPU architectureVAX shine tsarin koyar da CISC da aka kafa gine-gine (ISA) da layin manyan injiniyoyi da wuraren aiki wanda Kamfanin Kayan Kayan Dijital (DEC) ya haɓaka a tsakiyar 1970s. VAX-11/780, wanda aka gabatar a ranar 25 ga watan Oktoba, a shekara ta 1977, shi ne na farko na kewayon mashahurai da manyan kwamfutoci masu aiwatar da VAX ISA. Fiye da samfura 100 aka gabatar a tsawon rayuwar ƙirar,[ana buƙatar hujja] tare da membobin ƙarshe da suka isa farkon shekarar 1990s. DEC Alpha ya ci nasarar VAX, wanda ya haɗa da fasali da yawa daga injin VAX don sauƙaƙe ɗaukar hoto daga VAX. An tsara VAX a matsayin wanda zai maye gurbin 16-bit PDP-11, ɗaya daga cikin mafi ƙarancin minicomputers a cikin tarihi tare da misalai kusan 600,000 da aka sayar. An tsara tsarin don bayar da jituwa ta baya tare da PDP-11 yayin da ake fadada ƙwaƙwalwar zuwa cikakken aiwatar da 32-bit da ƙara buƙatun da aka tsara ƙwaƙwalwar ajiya .