Possibility of assembly programming on HP 42S

[yardmax]

I am very curious about the possibility of programming direct machine code onto an hp42s through either the built in monitor or some rpn bug. I can't seem to find much info on the topic. Also, what is the possibility of ruining the calculator or making it unusable? I know that a memory reset would be pretty easy to cause, but I absolutely do not want to brick my 42.

Thanks in advance,

-Jack