Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 12h Subfunction 35h
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     This subfunction cannot be used unless both video adapters have a
     disable capability (Int 10h Function 12h Subfunction 32h).
 
     If there is no conflict between the system board video and the
     adapter board video in memory or port use, both video
     controllers can be active simultaneously and this subfunction is
     not required.
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