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Why mov 0900h, ax allowed in emu8086?

I just checked the manual again and MOV Immediate, REG is not allowed and actually illogical, but when I compile it works fine.

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The command immediate value MOV, REG is invalid, but emu8086 corrects this case. Instead of considering 0900h in MOV 0900h, ax as an immediate value, it marks 0900h as [DS: 0900h] , which represents a specific memory location.

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Source: https://habr.com/ru/post/1696032/

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