New Sonic 2 version

Nifty. Look at ROMNation for the ROM, they seem to have it. I've never been good at figuring out MAME though so I can't run it. You go for it.

 

Sweet. LOst can cut out the unecesarry bull from the ROM like he did with S1 Megaplay. I wonder if this is any different?

 

Perhaps Lost can port this baby to the Gen/MD like he did with S1.

Those screens look very interesting!

Edit: Download the ROM NEXT PAGE,

 

The ROM doesn't seem to use standard Genesis graphics. If you look through TLP you can find some weird things: (this is looking at it in GBA format, because it is slightly better looking)

These are obviously the CNZ art used in the slots. Why is it uncompressed?

Also, anyone mind explaining how to get the MAME emu to work?

 

I'm afraid I don't understand what you mean about the compression. After all, this was uncompressed data in the ROM for genesis.

 

Anyone had any luck running the rom? Regular MAME just keeps throwing errors at me about a missing file :P

EDIT:

Get MAME from here, then plonk turbo mame in the same folder as MAME. Create a folder in the roms folder called "mt_soni2" and put the rom files in it. Run tmame.exe Then type "mt_soni2" in the select game box

 

Well, I suppose you should look up that file on Google and drop it in the same directory as the other MAME files.

 

Aha! Apparently that extra file is the megatech bios, lets see if this works :D

EDIT: Yup it does Looks the same as regular Sonic 2 though

 

This is interesting to me. I never heard of Sonic arcade ports. Which levels were cut for the Sonic 1 port?
Also, how come ICEknight's screens show no TIME, but QJimbo's does?

 

Here's some info for you guys...

Rika, did you notice how the art is backwards? Everything in this ROM is byteswapped. I believe if we simply swap everything back, it'll work in an MD emulator. Don't take my word on this one though. All I knowis that all data will be normal if you byte swap the ROM. Look at the header: OSIN CHT E EHGDHEGO2 . All byteswapped data. This applies to all data in the ROM.

About the art being uncompressed, I don't know. Maybe the arcade system can't decipher the compression? Hell if I know.

 

That's not the same version. Remember, there were two Genesis-based arcade systems - Mega-Tech and Megaplay. You have the Mega-Tech version, the version that ICEknight is talking about is the Megaplay version. Sonic 1 was also different between Mega-Tech and Megaplay - the Megaplay version had a timer that counted down, instead of up, and no real ending.

 

I have the Mega Play ROM. :P

 

Well, you may have it, but you posted "mt_soni2.zip", which is the Mega-Tech version. =P

 

Ok I've got that one working fine as well. Again it needed the bios, in this case Megaplay :P The lack of time thingy is bizarre.

 

Sonic 2 —Mega Play
Sonic 2 —Mega Tech
Mega Play bios
Mega Tech bios


Happy?

 

Thanks a bunch. It looks like this ROM is indeed byteswapped (I know this was mentioned earlier, but I dunno if it was the MT or MP ROM being referred to). The game code is GM 00001051-02.

 

http://www.jameshansen.com/mame_with_sonic2_mp+mt.zip
That has everything you need to try these roms out, with mame, the roms, and bios. Just run tmame.exe Type in mt_soni2 in the Select game box for the MegaTech one and mp_soni2 for the MegaPlay one (the one with the missing time counter).

 

differances so far:

No level timer
insert coin text
Special Stages removed
100 rings does not give you an extra life
All 1-UP boxes have been replaced with Super Ring boxes
No jump sound (emu bug or rom?)
Some badniks removed (eg. the praying mantis at the top of a long screw in MTZ3)
No demo mode! Title screen never ends!

This ROM does have an ending and everything after you beat it, unlike S1.

 

Not that I give a shit, but you just violated the MAME license ^_^