; opcodes.asm -- which bytes does each spelling assemble to?  (read the listing, never run)
bits 16
org 0x100
    int3                    ; the one-byte breakpoint        -> CC
    int 3                   ; "INT n" with n = 3 in NASM      -> CD 03
    db 0CDh, 03h            ; the same two bytes, written out -> CD 03
    int 21h                 ; DOS entry point                 -> CD 21
    int 10h                 ; BIOS video                      -> CD 10
    into                    ; one-byte INTO                   -> CE