|> What I don't know how to do, nor find on Google,is turn off a specific bit whether it is set or not.
you "mask" (using & the "bitwise-and") with a bitvector which is only 0 if and only if you want to turn off.
DB<22> $in = 0b10101010
DB<23> $mask = 0b11110000 # 1 keep 0 erase
DB<24> printf "%b", $in & $mask
for more see Mask (computing)
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