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26-bit architectures - ARM
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ARM 26-bit architectures refers to a number of early ARM ISA versions and microarchitectures that implement them that only implement a 26-bit address space. Those architectures have been long obsolete and are no longer supported or implemented. 26-bit ARM ISAs are known as ARMv1, ARMv2, and ARMv2a along with the corresponding microarchitectures ARM1, ARM2, ARM3, and the ARM250.