Control Panel/Driver The Wacom Tablet control panel and driver file is required for any tablet on all systems. Extensions The following extension fix problems on various systems. The suggested extensions will already be automatically selected. av Serial Extension. This extension fixes problems with the serial driver in the ROMs of 660av and 840avs. It is recommended when using a serial tablet on these machines. PowerBook ADB Patch. This extension fixes problems with the ADB driver in the ROMs of the PowerBook 160/165/165c/180 or 180c machines. It is recommended when using an ADB tablet on these machines. ADB ReInit Patch. This extension fixes problems with the ADB driver in the ROMs of the PowerBook 140/145/170 or Quadra 700/900/950 machines. It is recommended when using an ADB tablet on these machines. Comm. Toolbox. This installs the Communications Toolbox on Systems 6 machines. The Communications Toolbox is required for both ADB and serial tablets when using System 6.