Manufacturer and device code for a chip.
Lower byte will contain the device code.
Upper byte will contain the manufacturer code.
If a chip code is unknown because it could not
be queried out of the chip, the value of this
object will be 00:00.
Since programming algorithms differ from chip type to
chip type, this chip code should be used to determine
which algorithms to use (and thereby whether the chip
is supported in the first place).