A sarrafa kwamfuta, BIOS ( /b aɪ ɒ s, - oʊ s /, BY -oss, - ⁠ ohss ; wani gajeren bayani ne na Basic Input / Output System wanda kuma aka fi sani da suna System BIOS, ROM BIOS ko PC BIOS ) ana amfani da firmware ne don aiwatar da farawar kayan masarufi yayin aiwatar da booting (farawa-kunnawa), da kuma samar da sabis na lokaci don tsarin aiki da shirye-shirye. . BIOS firmware ta kasance an riga an girka ta akan kwamiti na komputa na sirri, kuma shine software na farko da zata fara aiki yayin kunna ta. Sunan ya samo asali ne daga Asalin Input/Output System wanda aka yi amfani dashi a cikin tsarin aiki na CP/M a shekarar 1975. BIOS asalin mallakar IBM PC ne wasu kamfanoni suka sake kera shi (kamar su Phoenix Technologies ) suna neman ƙirƙirar tsarin da zai dace. A dubawa na cewa asalin tsarin hidima a matsayin zahiri shine misali. BIOS a cikin PCs na zamani suna farawa da kuma gwada abubuwan haɗin kayan aikin, kuma suna loda mai ɗora kaya daga na'urar adana kayan aiki wanda zai fara tsarin aiki.