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in 16 bit assembly you can use a 16 bit register like or use one of the 2 8 bit registers that comprise it why can you only use the high memory addresses in 32 and 64 bit assembly ?

Zaper
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  • [Why can I access lower dword/word/byte in a register but not higher?](https://stackoverflow.com/q/45500399/995714) – phuclv Nov 09 '17 at 16:35
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    Because the architecture has not been designed to allow this. – fuz Nov 09 '17 at 17:06
  • arent ah and al sudo registers ? im pretty sure this is related to the assembly not the hardware – Zaper Nov 12 '17 at 10:56

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