4000A  (250-5000A)          Math Co-processor           Faxback Doc. # 1467

*Check Main Logic Board Revision

80287-8 mhz Math Co - 4000 Rev A or B main logic board
                      Installation in socket U25
                      Jumper E8-E9

80287-10 mhz Math Co - 4000 Rev B only
                       Install chip in socket U25
                       Jumper E8-E9
                       Installation of 10 mhz oscillator required

80387-16 mhz Math Co - 4000 Rev C or greater only
                       Installation recommended as improper installation
                       can cause damage to chip.
                       Install chip in socket U15 and also jumper E3-E4.