INT 6B - DECnet DOS - PORTIBM PC Portable (uses same BIOS as XT) DRIVER InstallCheck: test for a signature area (see #03729) immediately preceding the interrupt handler SeeAlso: INT 6A"DECnet",INT 6C"DECnet" Index: installation check;DECnet DOS Port Driver Format of DECnet DOS signature area: Offset Size Description (Table 03729) -5 BYTE major version number -4 BYTE minor version number -3 3 BYTEs signature (ASCII "PDV")