Methods and apparatus to preform inter-integrated circuit address modification

An example system includes: a device coupled to a data line, the device configured to: send a first command on the data line, the first command including a first address; after sending the first command, read a first value on the data line, the first value including data from a first target device and a second target device; responsive to reading the first value, send a second command including the first address and data representing the first value on the data line; send a third command on the data line, the third command including the first address; after sending the third command, read a second value on the data line, the second value including data from the first target device and the second target device; responsive to reading the second value, send a fourth command on the data line, the fourth command including the first address.