a) computer programs and data loaded in a class of memory that cannot be dynamically modified by the computer during processing; b) a hardware that contains a computer program and data that cannot be changed in its user environment. The computer programs and data contained in firmware are classified as software; the circuitry containing the computer program and data is classified as hardware; c)program instructions stored in a read-only storage, talitluslikult põhimälust sõltumatul viisil salvestatud käsu- ja andmekogum, nt mikroprogramm püsimälus