5ļ¼66
JMA-9100/7100 Installation Manual > 5.OPTION UNIT > 5.4  INSTALLATION OF SUB-OPERATION UNIT AND EXPANSION OF 
TRACKBALL
Remove eight screws from the side surface of the operating unit, remove the lid 
and turn the unit upside down. The board is fixed onto the top panel side.
Fig 5-66: Connection of expanded trackball
An USB to PS/2 conversion connector can be used.
Fig 5-67: Expanded trackball