qa.hlp (Table of Contents; Topic list)
Int 10H Function 12H Subfunction 35H
   Summary  Notes  Back
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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 usage, both video controllers can be active
    simultaneously and this subfunction is not required.
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