61 INT 61 - reserved for user interrupt
61 INT 61 - Atari Portfolio - EXTENDED BIOS
61 INT 61 - TI Professional PC - FACTORY ROM DATA AREA POINTER (NOT A VECTOR!)
61 INT 61 - HP 95LX System Manager - LOAD DS
61 INT 61 - JPI TopSPEED Modula-2 v1 - PROCEDURE EXIT TRAP
61 INT 61 - Adaptec and OMTI controllers - DRIVE 0 DATA
61 INT 61 - Sangoma CCIP (CCPOP 3270 resident module) INTERFACE
61 INT 61 - VIRUS - "SEMTEX"/"Screen Trasher" - INT 21h SUBSTITUTE
61 INT 61 - PC-Magazin - PAGE, SWAPx
61 INT 61 - TCPOpen kernel - API
61 INT 61 - XFS v1.76 - XFSKRNL.EXE - API
61 INT 61 - FTP Software PC/TCP - TCP/IP TSR System Call interface
61 INT 61 u - PC/TCP kernel v2.05 - NOP for SLIP kernel

 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E   
 30    32    34                                 
                                                
 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F