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A comment on What Happens When a CPU Starts. Parent comment
Only watched the first video yet, after initializing itself the CPU actually runs this code (because D8-D15 is wired to zero):
addr opcode FFFFF0 90 NOP FFFFF1 00 90 00 90 ADD [BX+SI+9000],DL FFFFF5 00 90 00 90 ADD [BX+SI+9000],DL FFFFF9 00 90 00 90 ADD [BX+SI+9000],DL FFFFFD 00 90 00 -- !! general protection fault
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Only watched the first video yet, after initializing itself the CPU actually runs this code (because D8-D15 is wired to zero):
You can see it read and write the same address three times, then fetch the interrupt 0Dh vector and push flags+CS+IP to the stack :)