Int 21 Fn 252F  P - Phar Lap 386/dos-ext Vmm V3.0 - Write Record To Vmm P  [E]

   AX = 252Fh
   DS:EBX -> data to be written
   CX = size of data in bytes

Return: CF clear if successful
   CF set on error
       EAX = error code (85h no page log file or not 386/VMM)