How likely is it that a newbie programmer in asm could mistakely cause hardware damage to the cpu etc by running some bad instructions.

How likely is it ?

If you're writing drivers and crap for a CNC or something, then you could cost a business millions.

Two ways that might cause damage to a PC style computer: wrong BIOS call to a device erasing data, or throwing an old CPU(with design flaw, and inadequate cooling device) into somesort of lock till it overheated.

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