question: När introducerade ibm 20286 based pc/at?
answers.text: 1984
context: IBM Personal Computer/AT
  IBM Personal Computer AT, mer allmänt känd som IBM AT och ibland även kallad PC AT eller PC/AT, var IBM:s andra generation av PC:n. Den var utformad med en 6 MHz Intel 80286-mikroprocessor och släpptes 1984 som System Unit 5170. Namnet AT stod för "Advanced Technology" och valdes eftersom AT erbjöd olika tekniker som då var nya i persondatorer; ett sådant framsteg var att 80286-processorn stödde skyddat läge. IBM släppte senare en 8 MHz-version av AT.
answers_en.text: 1984
context_en: IBM Personal Computer/AT
  The IBM Personal Computer AT, more commonly known as the IBM AT and also sometimes called the PC AT or PC/AT, was IBM's second-generation PC, designed around the 6 MHz Intel 80286 microprocessor and released in 1984 as System Unit 5170. The name AT stood for "Advanced Technology," and was chosen because the AT offered various technologies that were then new in personal computers; one such advancement was that the 80286 processor supported protected mode. IBM later released an 8 MHz version of the AT.
title_en: IBM Personal Computer/AT