On Sat, Sep 10, 2016 at 12:04:02AM -0500, Dave Philipsen wrote: > Looks like ECB will do boolean logic up to 15 bits. It does in 16 bit. ECB converts the result in signed values, so you get a value range from -32768 to +32767 dec hex -32768 $8000 -32767 $8001 ... -1 $FFFF 0 $0000 1 $0001 ... 32767 $7FFF Johann K.