I've always seen some notaions at the end of different versions of roms, but never really thought much about it until now. What do they actually mean? Hacked and beta versions?

The most common notations I see are:
[b1], [b2]......etc
[h1], [h2]......etc
[!]

Is there a way to tell whats different about each version?

Thanks

              ..................
...............: STANDARD CODES ::...............
:                                               :\
:   [a] Alternate        [p] Pirate             :\
:   [b  Bad Dump         [t] Trained            :\
:   [f] Fixed            [T-] OldTranslation    :\
:                        [T+] NewerTranslation  :\
:   [h] Hack             (-) Unknown Year       :\
:   [o] Overdump         [!] Verified Good Dump :\
:  (M#) Multilanguage (# of Languages)          :\
: (###) Checksum       (??k) ROM Size           :\
:  ZZZ_ Unclassified   (Unl) Unlicensed		:\
:...............................................:\
 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

                .................
................: SPECIAL CODES ::...............
:                                               :\
: .-----Gameboy-----.  .----Super Nintendo----. :\
: [  [C] Color      ]  [ (BS) BS ROMs         ] :\
: [  [S] Super      ]  [ (ST) Sufami Turbo    ] :\
: [ [BF] Bung Fix   ]  [ (NP) Nintendo Power  ] :\
: `-----------------'  `----------------------' :\
:                      .--------Atari---------. :\
: .-----Genesis-----.  [ (PAL) Euro Version   ] :\
: [ (1) Japan       ]  `----------------------' :\
: [ (4) USA         ]  .---------GBA----------. :\
: [ (5) NTSC Only   ]  [ [hI??] Intro hacks   ] :\
: [ (8) PAL Only    ]  `----------------------' :\
: [ (B) non USA     ]  .--------Coleco--------. :\
: [ [c] Checksum    ]  [ (Adam) ADAM Version  ] :\
: [ [x] Bad Checksum]  `----------------------' :\
: [ [R-] Countries  ]                           :\
: `-----------------'                           :\
:                      .--------NES/FC--------. :\
: .--NeoGeo Pocket--.  [ (PC10) PlayChoice 10 ] :\
: [ [M] Mono Only   ]  [   (VS) Versus        ] :\
: `-----------------'  [ [hFFE] FFE Copier fmt] :\
:                      `----------------------' :\
:...............................................:\
 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

                .................
................: COUNTRY CODES ::...............
:                                               :\
:   (1) Japan & Korea      (4) USA & BrazilNTSC :\
:   (A) Australia          (J) Japan            :\
:   (B) non USA (Genesis)  (K) Korea            :\
:   (C) China             (NL) Netherlands      :\
:   (E) Europe            (PD) Public Domain    :\
:   (F) France             (S) Spain            :\
:   (F) World (Genesis)                         :\
:  (FC) French Canadian   (SW) Sweden           :\
:  (FN) Finland            (U) USA              :\
:   (G) Germany           (UK) England          :\
:  (GR) Greece           (Unk) Unknown Country  :\
:  (HK) Hong Kong          (I) Italy		:\
:  (H)  Holland          (Unl) Unlicensed       :\
:...............................................:\
 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

             .......................
.............: STANDARD CODE NOTES ::............
:                                               :\
: [a] This is simply an alternate version of a  :\
:     ROM. Many games have been re-released to  :\
:     fix bugs or even to eliminate Game Genie  :\
:     codes (Yes, Nintendo hates that device).  :\
:             -------------------               :\
: [b  A bad dump often occurs with an older     :\
:     game or a faulty dumper (bad connection). :\
:     Another common source of [b  ROMs is a    :\
:     corrupted upload to a release FTP.        :\
:             -------------------               :\
: [f] A fixed game has been altered in some way :\
:     so that it will run better on a copier    :\
:     or emulator.                              :\
:             -------------------               :\
: [h] Something in this ROM is not quite as it  :\
:     should be. Often a hacked ROM simply has  :\
:     a changed header or has been enabled to   :\
:     run in different regions. Other times it  :\
:     could be a release group intro, or just   :\
:     some kind of cheating or funny hack.      :\
:             -------------------               :\
: [o] An overdumped ROM image has more data     :\
:     than is actually in the cart. The extra   :\
:     information means nothing and is removed  :\
:     from the true image.                      :\
:             -------------------               :\
: [t] A trainer is special code which executes  :\
:     before the game is begun. It allows you   :\
:     to access cheats from a menu.             :\
:             -------------------               :\
: [!] Verified good dump. Thank God for these!  :\
:...............................................:\
 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

> ..................
> ...............: STANDARD CODES ::...............
> : :\
> : [a] Alternate [p] Pirate :\
> : [b Bad Dump [t] Trained :\
> : [f] Fixed [T-] OldTranslation :\
> : [T+] NewerTranslation :\
> : [h] Hack (-) Unknown Year :\
> : [o] Overdump [!] Verified Good Dump :\
> : (M#) Multilanguage (# of Languages) :\
> : (###) Checksum (??k) ROM Size :\
> : ZZZ_ Unclassified (Unl) Unlicensed :\
> :...............................................:\
> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>
> .................
> ................: SPECIAL CODES ::...............
> : :\
> : .-----Gameboy-----. .----Super Nintendo----. :\
> : [ [C] Color ] [ (BS) BS ROMs ] :\
> : [ [S] Super ] [ (ST) Sufami Turbo ] :\
> : [ [BF] Bung Fix ] [ (NP) Nintendo Power ] :\
> : `-----------------' `----------------------' :\
> : .--------Atari---------. :\
> : .-----Genesis-----. [ (PAL) Euro Version ] :\
> : [ (1) Japan ] `----------------------' :\
> : [ (4) USA ] .---------GBA----------. :\
> : [ (5) NTSC Only ] [ [hI??] Intro hacks ] :\
> : [ (8) PAL Only ] `----------------------' :\
> : [ (B) non USA ] .--------Coleco--------. :\
> : [ [c] Checksum ] [ (Adam) ADAM Version ] :\
> : [ [x] Bad Checksum] `----------------------' :\
> : [ [R-] Countries ] :\
> : `-----------------' :\
> : .--------NES/FC--------. :\
> : .--NeoGeo Pocket--. [ (PC10) PlayChoice 10 ] :\
> : [ [M] Mono Only ] [ (VS) Versus ] :\
> : `-----------------' [ [hFFE] FFE Copier fmt] :\
> : `----------------------' :\
> :...............................................:\
> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>
> .................
> ................: COUNTRY CODES ::...............
> : :\
> : (1) Japan & Korea (4) USA & BrazilNTSC :\
> : (A) Australia (J) Japan :\
> : (B) non USA (Genesis) (K) Korea :\
> : (C) China (NL) Netherlands :\
> : (E) Europe (PD) Public Domain :\
> : (F) France (S) Spain :\
> : (F) World (Genesis) :\
> : (FC) French Canadian (SW) Sweden :\
> : (FN) Finland (U) USA :\
> : (G) Germany (UK) England :\
> : (GR) Greece (Unk) Unknown Country :\
> : (HK) Hong Kong (I) Italy :\
> : (H) Holland (Unl) Unlicensed :\
> :...............................................:\
> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>
> .......................
> .............: STANDARD CODE NOTES ::............
> : :\
> : [a] This is simply an alternate version of a :\
> : ROM. Many games have been re-released to :\
> : fix bugs or even to eliminate Game Genie :\
> : codes (Yes, Nintendo hates that device). :\
> : ------------------- :\
> : [b A bad dump often occurs with an older :\
> : game or a faulty dumper (bad connection). :\
> : Another common source of [b ROMs is a :\
> : corrupted upload to a release FTP. :\
> : ------------------- :\
> : [f] A fixed game has been altered in some way :\
> : so that it will run better on a copier :\
> : or emulator. :\
> : ------------------- :\
> : [h] Something in this ROM is not quite as it :\
> : should be. Often a hacked ROM simply has :\
> : a changed header or has been enabled to :\
> : run in different regions. Other times it :\
> : could be a release group intro, or just :\
> : some kind of cheating or funny hack. :\
> : ------------------- :\
> : [o] An overdumped ROM image has more data :\
> : than is actually in the cart. The extra :\
> : information means nothing and is removed :\
> : from the true image. :\
> : ------------------- :\
> : [t] A trainer is special code which executes :\
> : before the game is begun. It allows you :\
> : to access cheats from a menu. :\
> : ------------------- :\
> : [!] Verified good dump. Thank God for these! :\
> :...............................................:\
> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
>
>
> So long...
>
>
> 'Now the time is here
> for Iron Man to spread fear,
> Vengeance from the grave
> kills the people he once saved'
> © Black Sabbath '70
> *grunt* Metal *gnarf*
>