INT 62 u - FGDRIVER v3.03 - "FG_PAGESIZE" - GET VIDEO PAGE SIZE FOR CURR MODE
        AX = 006Dh
Return: DX:AX = page size in bytes
Note:   For FGDRIVER v1.10, this function was "FG_WAITKEY" (see AX=00ADh);
          "FG_PAGESIZE" did not exist yet
SeeAlso: AX=005Dh

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