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+---
+title: "POWER Instruction Set Architecture 2.07"
+publicreview: false
+date: 2022-01-01
+draft: false
+---
+
+The Power Instruction Set Architecture (ISA) Version 2.07B is a specification that describes the architecture used
+for the IBM® POWER8®, IBM® POWER8® with NVIDIA® NVLink™ Technology, the Suzhou Powercore Technology CP1 processor
+& prior IBM Power Architecture® processors.
+It defines the instructions the processors execute. It consists of five books and a set of appendices.
+
+- Book I, Power ISA User Instruction Set Architecture,
+  covers the base instruction set and related facilities available to the application programmer.
+- Book II, Power ISA Virtual Environment Architecture,
+  defines the storage model and related instructions and facilities available to the application programmer.
+- Book III-S, Power ISA Operating Environment Architecture - Server Environment,
+  defines the supervisor instructions and related facilities used for general purpose implementations.
+- Book III-E, Power ISA Operating Environment Architecture - Embedded Environment,
+  defines the supervisor instructions and related facilities used for embedded implementations.
+- Book VLE, Power ISA Operating Environment Architecture - Variable Length Encoding (VLE) Instructions Architecture,
+  defines alternative instruction encoding and definitions intended to increase instruction density for very low end implementations.
+
+The Power ISA specification is an important resource for software developers especially compiler and tool chain developers.
+Firmware and operating system developers will also find it essential.
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+versions:
+  - number: "2.07"
+    date: "2013-05-03"
+    download: ""
+    description: "Initial release."
+  - number: "2.07b"
+    date: "2017-03-29"
+    download: "https://ibm.ent.box.com/s/1hzcwkwf8rbju5h9iyf44wm94amnlcrv"
+    description: "Update specification."