Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 1Ch
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     Subfunction 00h is used to determine the size of buffer that will
     be necessary to contain the specified state information. The
     caller must supply the buffer.
 
     The current video state is altered during a save state operation
     (AL = 01h). If the requesting program needs to continue in the same
     video state, it can follow the save state request with an
     immediate call to restore the video state.
 
     This function is supported on the VGA only.
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