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Salam,
My friend works on UPS commercially. We can get help by him, he is an electrical engineer. Please contact on my cell for further discussion 03332992922.
jb means "jump if bit set"
$ means "same location where code rest in code memory
jb 'any bit of 8051',$
test the bit "any bit of 8051" if bit is set stay here else next statement
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