Need to find someone capable of burning the Mega CD model 2 bios off to use in a region mod in my Model 2 Sega CD. Any service out there that anyone knows of capable of doing it, and doing it correctly?
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Need to find someone capable of burning the Mega CD model 2 bios off to use in a region mod in my Model 2 Sega CD. Any service out there that anyone knows of capable of doing it, and doing it correctly?
www.buyicnow.com
Make sure your SCD Bios is byte swapped correctly, pick out a 27C1024 (or however big your BIOS is) and pay for 1x EPROM burning service. Keep the filename shorter than 4 characters. Email them the file.
You save more on shipping if you get more chips.
Ok what do I do to check to make sure it is byte swapped/what do I need to use to check the bios file I have on hand? Sorry man, this is new to me. Any info you can give me, much thanks in advance.
Load the BIOS into Kega Fusion as if it were a Genesis ROM. If the header on the top of the window is legible, then it's not byte swapped.
A byteswapped Sega CD BIOS V1.10 header should look like this (as an example):
ESAGC- DOBTOR MO
Yeah, guess it is not swapped. :(
http://i9.photobucket.com/albums/a66...ps9a16b9f4.png
What utility would I use to do it? Also, just out of curiosity, has someone tried to just make a Mega CD 2 bootcart by burning off the bios on a eprom and modding a normal Genesis cart, swapping out the maskrom for the eprom/bios? I know you can load the bios files up in a flash cart and all, but I'd actually be interested in making myself a dedicated bootcart instead. I can region mod the system and all just fine, but a cart method would be preferable since I could use it on a back up system in case my main one died.
Here's a batch file that can byte swap files for you. Rename your file to game.bin and double click the batch file.
http://www.mediafire.com/download/2s...9/byteswap.zip
You can't run a Sega CD BIOS from the cartridge slot, I already tried. I know the Everdrive carts can do it, but it probably starts up the Sega CD and sends the BIOS image to it. A plain BIOS in the cart slot can't do that.
If push comes to shove and you can't byteswipe it, ask on assembler forums. Thereare a couple of fellas on there that do it.
Good deal, the above helps for sure. Sucks about the cart thing, would have been nice. I don't think I can use the utility in Win 7 64 bit, but it will probably work in my Windows 98 machine, fine so I will try it in that. Thanks guys.
I tried it too :(Quote:
Originally Posted by Guntz
How about Linux users? I don't have Windows. (And no Macs anymore).
It makes me wonder what those dedicated region changing carts do. I've got the CDX (not talking about the console) which is designed for the Model 1 and works fine. If those have been dumped you could probably make your own using a copy of that ROM, doing whatever magic it does.Quote:
Originally Posted by Guntz
There might be some hex editors that support byte swapping. All you're doing, for Genesis at least, is swapping the position of two bytes at every two byte intervals. 1 2 3 4 becomes 2 1 4 3, or SEGA becomes ESAG.
It's probably no magic why devices like the CDX and Everdrives work, but all I know is a stock BIOS in the cart slot won't work. Normally, the Sega CD can't boot from that slot, the expansion port has some extra signals. (yes, the expansion port is basically a 2nd cartridge slot)
Mike PM me on PCEFX the bios you want. I have a folder handy with all binaries and can swap and burn a few for ya.
If you want a multi bios that switches region with the high address...I can do that too :)
Any decent hex editor should be able to byteswap the rom.
I use 010 editor, in that it's under tools->hex operations->swap->treat data as hex, and signed short.
I can burn bios files but I only have a couple of 1mbyte 44pin soic flash roms at the moment.
Sweet man thanks. Yeah I posted on PCEFX about this but did not get any replies. Left me kind of stumped lol. I will drop you a pm over there here in a few. Thanks!Quote:
Originally Posted by bustedstr8
I second this recommendation. I bought 10 chips from them via eBay. It was as easy as sending the Jp model 1 region free (byte swapped) to them via email and a few days later, the chips were sent. I thought they were good quality too, the legs are nice and sturdy. Very good if you are putting them in a socket, or if you own a Jp Model 1 with the socket.Quote:
Originally Posted by Guntz
I think all up, the chips cost me about $28US.
So, does this look correct to you guys as far as what to do to have two bios installed in a Model 2? (Forgive sub-par paintshop skills, was in a hurry)
http://i9.photobucket.com/albums/a66...psf65645bf.png
It looks pretty good, 1K seems a bit low for pullups....I would try 4.7K first.
http://www.mmmonkey.co.uk/console/sega/megacd.htm
1k is what they used on there on their switch, so I just figured that was the one everyone was using. :)
Yeah everyone seemed to be using 1k ohm resistors in their bios mod on the 5volt line so I figured that was just the norm for this mod.