Int 61 Fn 0F  - PC/tcp Kernel V2.05+ - "get_netversion" - Get Software Ve  [N]

   AH = 0Fh

Return: CF clear
   AX = version (AH = major, AL = minor)
   BX = patch level

Notes: patch levels are no longer used starting with version 2.10; instead,
     the minor version level is incremented.
   Beame&Whiteside's BWPCTCP v3.0a shim reports version 2.05, but does not
     set BX

See Also: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP"