Die photo of the 8086 microprocessor with key functional blocks labeled.
https://assets.oldbytes.space/assets.oldbytes.space/media_attachments/files/110/005/947/810/191/820/original/576affa9c8349437.png
This system is a bit complicated, but gives the 8086 a lot of flexibility for specifying which registers to use.
For more information, see my blog post https://www.righto.com/2023/03/8086-register-codes.html
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