1                                  ; opcodes.asm -- which bytes does each spelling assemble to?  (read the listing, never run)
     2                                  bits 16
     3                                  org 0x100
     4 00000000 CC                          int3                    ; the one-byte breakpoint        -> CC
     5 00000001 CD03                        int 3                   ; "INT n" with n = 3 in NASM      -> CD 03
     6 00000003 CD03                        db 0CDh, 03h            ; the same two bytes, written out -> CD 03
     7 00000005 CD21                        int 21h                 ; DOS entry point                 -> CD 21
     8 00000007 CD10                        int 10h                 ; BIOS video                      -> CD 10
     9 00000009 CE                          into                    ; one-byte INTO                   -> CE