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Low-level languages are generally referred to as '''assembly''' languages. Most instructions in such languages equate directly to a single machine instruction. Each machine architecture has its own assembly language, so programs written in such languages are generally very machine-specific and are not portable. The instructions in such languages are usually fairly cryptic, often using abbreviations such as ADD, JNE, LR, LI, etc. In the early days of computing (up to about 1ate late 1950's) most programming was done in [[assembly language]], partly due to the limited power and memory capacity of early computers.