66 INT 66 - reserved for user interrupt
66 INT 66 - Adaptec controllers - DRIVE 1 DATA
66 INT 66 - TI Professional PC - SYSTEM INFORMATION (NOT A VECTOR!)
66 INT 66 - Data General DG10 - MicroECLIPSE COPROCESSOR INTERFACE
66 INT 66 C - Nanosoft, Inc. TurboNET - NETWORK PROCESSING ???
66 INT 66 - Pdisk by Scott Garfinkle - Overwritten for Hard Drive information
66 INT 66 - Microsoft Windows VITD.386 Virtual Interval Timer
66 INT 66 - Newkey v5.4 - INSTALLATION VECTOR
66 INT 66 - PC-DRAFT - TABLET/DIGITIZER DRIVER
66 INT 66 - PC-Magazin - INCA
66 INT 66 - PenDOS - PMOUSE - ALTERNATE API

    01 02 03 04 05 06 07                        
 10 11 12 13 14 15 16                           
    21 22 23 24 25    27 28 29 2A 2B          2F
          33                                    
 40 41 42 43 44                                 
 50 51 52 53                                    
                                                
                               AA               
                                                
                C5                              
                                                
                                              FF