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/vr/ - Retro Games

File: 113 KB, 750x500, sega-genesis-mega-2-1.jpg [View same] [iqdb] [saucenao] [google]

Anonymous Tue Jan 3 05:20:39 2023 No.9539630 [Reply] [Original]

hey remember that mini genesis 2 that came out a few months ago? here the roms for it:
https://files.catbox.moe/4spm1f.zip

for space saving only games that differ from known dumps are included. also no sega cd games because they use some custom compression format that hasn't been figured out yet.
all the new games don't work in any of the emulators i've tried but hey it's out there now.

>>	Anonymous Tue Jan 3 05:49:54 2023 No.9539689 >>9539630 >games that differ from known dumps What's different about them?

Anonymous Tue Jan 3 05:59:42 2023 No.9539713

For people that don't know about the new games on it:
>The Mini 2 includes seven “bonus games,” two of which are previously unreleased titles, and the others are new ports of games from another platform. The previously unreleased games are Devi & Pii and Star Mobile. The five new ports are Fantasy Zone, Space Harrier 2 (+ Space Harrier), Spatter, Super Locomotive, and Vs. Puyo Puyo Sun.
https://www.polygon.com/23312308/sega-genesis-mini-2-full-games-list-release-date
https://www.youtube.com/watch?v=YlG9fuOeI_s
https://www.youtube.com/watch?v=HF95QMGeIGc

>>	Anonymous Tue Jan 3 06:00:47 2023 No.9539714 File: 23 KB, 400x400, thumbs.jpg [View same] [iqdb] [saucenao] [google] >>9539630 Thanks OP, I wanted to try these. I always feel weird downloading random files off 4chan, but you delivered.

>>	Anonymous Tue Jan 3 06:22:48 2023 No.9539745 >>9539689 not sure other than they didn't match known hashes the only difference i know for sure is that super street fighter 2 replaces the hong kong flag with the china flag (lol)

>>	Anonymous Tue Jan 3 06:41:07 2023 No.9539769 >>9539745 Based.

Anonymous Tue Jan 3 06:53:19 2023 No.9539786

>>9539630
Family got me one of these for Christmas, no idea how they even knew about it.

I've never owned a mini console before now, I know some people have managed to hack theirs to put more games on it, don't know if that's something that can be done with this thing.

>>	Anonymous Tue Jan 3 12:59:46 2023 No.9540157 >>9539630 Thanks for this. I can't get the new games to run at all. BlastEm Dev version gives an error or black screen.

>>	Anonymous Tue Jan 3 13:01:46 2023 No.9540160 >>9540157 they might have some sort of retarded header added to them, or maybe even weakly encrypted

>>	Anonymous Tue Jan 3 13:03:01 2023 No.9540162 >>9540160 I inspected their headers and did not see anything particularly out of place.

>>	Anonymous Tue Jan 3 13:06:23 2023 No.9540168 File: 278 KB, 2371x1299, hex.png [View same] [iqdb] [saucenao] [google] >>9540162 roms match to me, i think the only thing they changed were like copy right date shit

>>	Anonymous Tue Jan 3 13:13:41 2023 No.9540173 >>9540168 The variations work fine. It's the brand new games they made that aren't working. It's not a huge surprise.

>>	Anonymous Tue Jan 3 13:58:51 2023 No.9540265 >>9540173 seems .smd is an interleaved format. you probably just have to deinterleave them

Anonymous Tue Jan 3 14:08:14 2023 No.9540276

>>9539745
One difference I'm aware of is that for Bare Knuckle III, Ash's stage and mini-boss fight were removed, skipping a portion of the game by instead taking you to the next playable stage.

https://www.timeextension.com/news/2022/10/sega-removes-controversial-character-from-bare-knuckle-3-on-mega-drive-mini-2
https://www.youtube.com/watch?v=DSdmG5D_5OI

Although if that was accomplished through ROM modification or through something like Lua scripting, I wouldn't know.

Anonymous Tue Jan 3 14:16:52 2023 No.9540284

>>9540265
Is that some rudimentary form of obfuscation to try and deter running the dumps in conventional emulators?
Why do that specifically for the new titles and not all other ROMs in the system?

It doesn't sound terribly difficult to work around though, if someone has the knowledge to correct the data structure.

The new ROMs predictably wouldn't boot in KEGA Fusion 3.64 or Genesis Plus GX v1.7.4 (via Retroarch).

>>	Anonymous Tue Jan 3 14:27:02 2023 No.9540306 >>9539713 What about "sega mark v" roms? Do they use some shit on the emulator side? Unlikely they used Sega 32x patches.

Anonymous Tue Jan 3 14:33:08 2023 No.9540316

>>9540276
Just tested out jp_jp_bare_knuckle_3.bin and it does indeed skip the entirety of Ash's stage.
It's a modified ROM, not scripting done on the Mega Drive Mini 2 itself.

Would be curious if dissecting the ROM would reveal if data was actually removed, or if it just jumps ahead in round 1 by changing an instruction at the end of the first part of round 1.

>>	Anonymous Tue Jan 3 14:37:47 2023 No.9540325 >>9540284 it's actually just an old format

>>	Anonymous Tue Jan 3 14:38:48 2023 No.9540326 >>9540284 see if this works >https://emutopia.com/index.php/emulators/item/406-rom-conversion/1077-sbwin

>>	Anonymous Tue Jan 3 14:59:02 2023 No.9540342 >>9540265 It doesn't appear to be interleaved. The headers are all in plaintext and you can see plaintext strings in the ROM.

>>	Anonymous Tue Jan 3 15:11:09 2023 No.9540358 >>9539630 Is it possible to add games to the system yet?

Anonymous Tue Jan 3 15:20:30 2023 No.9540365

>>9540326
No success, although the file from OP's zip is "jp_jp_Fantasy_Zone.smd" as an example, converting it to a bin using SBWin didn't achieve anything.
Either ROM functioned the same in Kega Fusion, it just produces noise audio. The CRC32 hash did change, though.

>>	Anonymous Tue Jan 3 15:48:17 2023 No.9540416 >>9540365 ah bummer, not sure then anon

Anonymous Tue Jan 3 15:53:38 2023 No.9540429
File: 97 KB, 881x718, idk.png [View same] [iqdb] [saucenao] [google]

>>9539630
i got jp punchput 3 to load in an old dos emulator but it stays on a blank screen never going past 15 fps.maybe ill tinker around a bit with the .smd file in a hex editor and try and figure out whats up

>>	Anonymous Tue Jan 3 15:58:56 2023 No.9540437 File: 54 KB, 833x660, possibilities.png [View same] [iqdb] [saucenao] [google] >>9540429 in the zip its an smd but debugger says its a bin checksum doesnt match hmmm posibly a fix right here

>>	Anonymous Tue Jan 3 16:01:17 2023 No.9540441 >>9539630 >hey remember that mini genesis 2 that came out a few months ago? Ehmmmmmmmmmmm, No.. No I don't remember that. but that's because Sega didn't care and its just not very easy to get here in Europe.

>>	Anonymous Tue Jan 3 16:45:44 2023 No.9540541 >>9540437 fixing the checksum did not work

Anonymous Tue Jan 3 16:54:58 2023 No.9540564

>>9540160
From what I've heard they're deliberately corrupted so they'll only work in the specific emulator. Someone with the right knowhow could probably make a patch for them to work (except for the Space Harrier games since those are made for fantasy hardware).

>>	Anonymous Tue Jan 3 19:04:03 2023 No.9540856 >>9540564 >(except for the Space Harrier games since those are made for fantasy hardware). well shit, I'm actually going to have to buy this this then... so much for new year's resolutions

>>	Anonymous Tue Jan 3 19:06:16 2023 No.9540861 >>9540564 >>9540856 What kind of fantasy hardware we talking about? We got MSU working on real hardware and MSU is fantasy hardware too, right?

>>	Anonymous Tue Jan 3 19:08:48 2023 No.9540868 >>9540856 >Good luck buying them because sega is retarded

Anonymous Tue Jan 3 19:41:53 2023 No.9540951

>>9539689
swiped this list from a system11 post -- likely incomplete

1 After Burner II
2 Atomic Runner
3 Bonanza Bros.
4 ClayFighter
5 Crusader of Centy
6 Desert Strike
7 Earthworm Jim 2
8 Ecco CD
9 Ecco Tides of Time CD
10 Elemental Master
11 Fatal Fury 2
12 Final Fight CD
13 Gain Ground
14 Golden Axe II (6B pad compatibility fixed)
15 Granada
16 Hellfire
17 Herzog Zwei
18 Mansion of Hidden Souls
19 Midnight Resistance
20 Night Striker
21 Night Trap
22 The Ninjawarriors (altered title graphics?)
23 The Ooze
24 OutRun (Ferrari in-game graphics altered)
25 OutRunners
26 Phantasy Star II (Easy mode, fast walk, reduced epilepsy flashes in battle; hold down B button during battles for fast forward)
27 Populous
28 Rainbow Islands Extra (altered in game music)
29 Ranger X
30 The Revenge of Shinobi (altered graphics, rev?)
31 Ristar
32 Robo Aleste
33 Rolling Thunder 2
34 Sewer Shark
35 Shadow Dancer (Twin Towers removed in title graphics)
36 Shining Force CD
37 Shining Force II
38 Shining in the Darkness
39 Silpheed
40 Sonic 3D Blast
41 Sonic CD
42 Space Harrier II (new sprite scaling)
43 Splatterhouse 2
44 Streets of Rage 3 (Ash stage removed)
45 Super Hang-On (which rev?)
46 Super Street Fighter II (improved audio balance?)
47 ThunderForce IV (fast mode, score fix)
48 Toejam & Earl in Panic on Funkotron
49 Truxton (revised music)
50 Vectorman 2
51 Viewpoint (slowdown removed?)
52 Virtua Racing
53 Warsong

>>	Anonymous Tue Jan 3 19:45:57 2023 No.9540961 >>9540951 >28 Rainbow Islands Extra (altered in game music) revising taito music is hella sketchy, is it better?

>>	Anonymous Tue Jan 3 20:40:49 2023 No.9541092 >>9539630 I can’t find anything about these being dumped on DuckDuckGo or google. Did you dump them yourself and do you know how to get the roms working?

Anonymous Tue Jan 3 21:14:02 2023 No.9541150

>>9541092
>Did you dump them yourself
yes
if anyone has a japanese unit let me know and i can write up a guide on how to dump it
>and do you know how to get the roms working?
at the moment there's no way, see >>9540564
they need patches to fix them up to work in emulators or real hardware

>>	Anonymous Wed Jan 4 00:02:52 2023 No.9541471 >>9539630 That's nice but I'm waiting for the hack to upload more games on it.

>>	Anonymous Wed Jan 4 00:06:48 2023 No.9541478 >>9539630 Back when they had more than 20 games to play and no annoying updates/in-game-transactions

Anonymous Wed Jan 4 02:38:03 2023 No.9541790
File: 119 KB, 1280x720, strange.png [View same] [iqdb] [saucenao] [google]

>>9541150
tricky tricky, well the headers seem ok and they load up. the checksum is off but that doesnt seem to effect other roms, just the unreleased ones. besides ive fixed and headers, checksum and file type (seems they are .bin but labeled .smd) and converting them in numerous different way.im definitely n ot an expert but it seems like only part of the rom is encrypted or maybe has a second header to tell the md mini2 where the rom really starts? im tryi ng to compare star control and sonic 1 with devi and pii. i dont really see much offf, just certain parts of the header and then there is an ASCII table in it at h1880. which i only usually see in old dos game, im not versed enough in console rom hacking to say if that is strange

>>	Anonymous Wed Jan 4 03:47:16 2023 No.9541915 >>9539630 thank you based anon.

>>	Anonymous Wed Jan 4 03:48:40 2023 No.9541918 nvm they dont work fuk u anon

Anonymous Wed Jan 4 04:50:54 2023 No.9542050

>>9541790
I tried them on the mega sd and only puyo puyo got to a black screen. I tried them in the exodus emulator using the debugger and it shows that its using some invalid op codes. I don't know much about 68000, I'm more into 8 bit but 68000 has some rigid rules for working code such as instructions being aligned to 2 bytes. I wonder if just putting in a nop for invalid opcodes will make the code go further. I think its just the emulator they used on the mini allowed them to do some shortcuts you can't do on the real hardware. I think even eventually space harrier will work on real hardware using the mega cd for help. I don't know of a way to step through code line by line like you can in emuliscious but it would help a lot.

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