A closeup of the 8086 die with the registers labeled.

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1. Ken Shirriff (kenshirriff@oldbytes.space)'s status on Saturday, 11-Mar-2023 21:25:03 UTC Ken Shirriff

   Intel introduced the 8086 microprocessor in 1978 and it still has a huge influence through the modern x86 architecture used today. This 16-bit processor contains a bunch of registers, some of them hidden. I reverse-engineered the 5-bit code that it uses to select registers. 🧵