Sega CD Question

[KnightWarrior]

I know for a fact Copied Games could be played on the Sega CD..I thought I heard you could run Genesis ROM's on it, Is that true, Can the Model 1 Sega CD run Copies also

[Iron Lizard]

I have a feeling not or we would all be doing that.

[evildragon]

They all can read copied CD-R's.

But ROMs, no. They would need to be literally reprogrammed because the memory mapping would be completely off. Besides, the medium is different, and there's only 768KB RAM on the Sega CD.

[tomaitheous]

They all can read copied CD-R's.

But ROMs, no. They would need to be literally reprogrammed because the memory mapping would be completely off. Besides, the medium is different, and there's only 768KB RAM on the Sega CD.

And at that, there's only 2megs(bit) available to the original CPU side.

[seganutt]

you can play coped games on any mega cd or sega cd what you need to do is download a rom convert the file to a iso covert music files to wyma and because you have a ntsc sega cd. it would be easy for you because most files are sega cd but if you are like me a mega cd pal owner you have to convert the files from say ntsc to pal with another program you can find out more by just cheking the net but it can be done :p

[evildragon]

you can play coped games on any mega cd or sega cd what you need to do is download a rom convert the file to a iso covert music files to wyma and because you have a ntsc sega cd. it would be easy for you because most files are sega cd but if you are like me a mega cd pal owner you have to convert the files from say ntsc to pal with another program you can find out more by just cheking the net but it can be done :p
Wow, I've never read such BS in a post before.

ROMs on a Sega CD IS NOT POSSIBLE! Memory mapping is different, and you CAN NOT play WMA music on Sega CD either.

[Joe Redifer]

And at that, there's only 2megs(bit) available to the original CPU side.
An entire 4 meg game can be stored in the RAM seamlessly, though. Take the Sega Classics disc(s) for example. The CD spins down for Streets of Rage and never ever spins again until you reset the system. Same goes for Revenge of Shinobi. Granted, the ROM is probably sliced up 6 ways from Sega's asshole, but it still plays as quickly as a real cart with no loading ever after the initial load.

[tomaitheous]

An entire 4 meg game can be stored in the RAM seamlessly, though.


No, it can't. The Genesis CPU only has 256k(2megabits) of RAM. The SegaCD unit has the rest of the ram and is not part of the Genesis CPU memory layout. Those conversion roms were re-assembled to for the SegaCD/Genesis memory system (i.e. swapping out 128k or 256k chunks at a time). That can get complicated depending on the games original layout (even requiring removing some things/features without building the game from the ground up).

[evildragon]

I thought Genesis had 64KB RAM.

[Zebbe]

Wow, I've never read such BS in a post before.

I have. A Sonic 2 port and a DVD for the NES. :D

[evildragon]

I have. A Sonic 2 port and a DVD for the NES. :D
Eck, I thought that was way past behind me.

Awful memory of a shameful past.

[TmEE]

I thought Genesis had 64KB RAM.

He meant MD 68K sees only 256K of the MCD RAM

[Joe Redifer]

No, it can't. .
What I meant by that is it can load an entire 4 meg game into it's RAM and never have to load any more data from the CD. When playing the game, it's as seamless as playing the real cartridge. I don't think any features would have to be removed as no one level will be bigger than 2 megs.

[tomaitheous]

I don't think any features would have to be removed as no one level will be bigger than 2 megs.

Probably true for lot/most of Genesis roms. It's too technical to go into details here, but there are situations were you would have to redesign a games structure to accommodate random access of reused info (tiles/data/LUTs/etc) that normally span the rom address range - or cut those features out. It's not always as simple as easily dividing a games levels into >2mbit sections. Just saying...

[Joe Redifer]

Do you believe this is why Golden Axe is only single player on the CD? I have a hard time believing that it was due to a memory restraint, being that it's only one more character on screen being controlled by another player.

[tomaitheous]

Do you believe this is why Golden Axe is only single player on the CD? I have a hard time believing that it was due to a memory restraint, being that it's only one more character on screen being controlled by another player.

I would assume it was something along those lines. It's possible that the process was more complicated then originally thought, and instead of redesigning the game, they just cut that feature. Remember, it's the combination of all the frames of sprites of the second player as well as the magic grafx, etc. Maybe it was fine for some levels, but a couple of levels it pushed the amount of ram over 2megabits? I dunno but I have a harder time believing that they accidentally left out that 2player feature. If the graphics are uncompressed, someone could look at the 2mbit Genesis ram of a save state and see what's up.

[seganutt]

Wow, I've never read such BS in a post before.

ROMs on a Sega CD IS NOT POSSIBLE! Memory mapping is different, and you CAN NOT play WMA music on Sega CD either.
crap roms can be coverted to play on on real hardware i have found a guide on how to do it just look for it on the net

[evildragon]

crap my but can be done google it :(
How about a better idea, which I know you'll never find, provide a link to said tool?

Know why it can't be found? Because it can't be done!

You can't put a ROM on an ISO, and load it into WRAM on the Sega CD, and expect it to magically work, because the correct memory location is on a cartridge that isn't even there. Oh, and to change memory locations, it involves recompiling from source. So, no binary ROM to ISO exists.

Gah, now I know why you guys hated me when I did those hoaxes years ago.

Oh, my favorite: WMA on Sega CD? WMA wasn't even around when Sega CD came out, let alone Sega CD having enough horse power to handle WMA decoding, it's a very complicated codec to the 68K CPU.

[seganutt]

well i dont know how to post a link yet but i can give you the name of site just whent and found it. emuasylum home off the top emulation cheak it out:)

[evildragon]

You do realize you were talking about ROMs right? You know a ROM is a CARTRIDGE, right?

Just want to make sure of this. Because a CART can't be converted to a CD with a magic tool.

Posting a link is as simple as copy and pasting, because it is copy and pasting.

[seganutt]

i mean mega cd games not mega drive .any way thank for that

[Iron Lizard]

If you must play your roms on the native hardware just buy the flashcart.

[TmEE]

You could play WMA/MP3/OGG on MCD, but not realtime to say so... maybe 1seconds of audio, then minute of silence, another second of sound, another minute of silence....

[Dirt Ball Gamer]

"Oh, my favorite: WMA on Sega CD? WMA wasn't even around when Sega CD came out, let alone Sega CD having enough horse power to handle WMA "

Whats WMA? womens martial arts?

[TmEE]

Windows Media Audio, you can think of it as Microsoft's own MP3 format