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In page Intel 80186:

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A few new instructions were introduced with the 80186 (referred to as the 8086-2 instruction set in some datasheets[citation needed]): enter/leave (replacing several instructions when handling stack frames), pusha/popa (push/pop all general registers), bound (check array index against bounds), and ins/outs (input/output of string). A useful immediate mode was added for the push, imul, and multi-bit shift instructions. These instructions were also included in the contemporary 80286 and in successor chips.[b]