mov 机器代码仅在一台机器上崩溃，两者都是 x86，可能不同的解释？

Question

Running the machine code

66 50 //push ax
b0 20 //mov al,0x20
a2 20 00 04 11 //mov ds:0x11040020,al // this seems to read 0xffffffffffffffff on one machine
66 58 //pop ax
c3 //ret

works on one machine but fails with an access violation trying to read 0xffffffffffffffff when executing the second move on the other.

both machines report report using the amd64 instruction set (checked via win10 environment variable)

none of these instructions seem to be from a new addition to the used instruction set but maybe they still get interpreted differently?

thanks in advance for the help

Answer 1

It seems like one machine interprets the machine code as x86-64 and the other as x86 leading to a crash on the x86-64 machine