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SpooNMan
Joined: 31 Oct 2007
Posts: 89
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 Posted: Sat Apr 18, 2009 3:31 am Post subject: Sonic Megamix working on a Super Magic Drive? |
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I have been trying to convert the rom, which is in .bin format, to .SMD using a few different apps, but it seems to corrupt the header making it unusable.
Using ucon64 converting .bin to .smd I get this. (If anyone has any ideas please let me know) I really wanted to play this rom on the real hardware.
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C:\Games\Sega Genesis\Super Magic Drive utils\ucon\sonic.smd
Super Com Pro/Super Magic Drive/SMD
00000300 53 45 47 41 20 4d 45 47 41 20 44 52 49 56 45 20 SEGA MEGA DRIVE
00000310 28 43 29 53 45 47 41 20 31 39 39 31 2e 41 50 52 (C)SEGA 1991.APR
00000320 53 6f 6e 69 63 20 31 20 4d 65 67 61 6d 69 78 20 Sonic 1 Megamix
00000330 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00000340 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00000350 53 6f 6e 69 63 20 31 20 4d 65 67 61 6d 69 78 20 Sonic 1 Megamix
00000360 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00000370 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00000380 47 4d 20 30 30 30 30 31 30 30 39 2d 30 30 64 0a GM 00001009-00d.
00000390 4a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 J
000003a0 00 00 00 00 00 13 94 97 00 ff 00 00 00 ff ff ff ................
000003b0 52 41 f0 20 00 20 00 00 00 20 3f ff 20 20 20 20 RA. . ... ?.
000003c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
000003d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
000003e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
000003f0 4a 55 45 20 20 20 20 20 20 20 20 20 20 20 20 20 JUE
Genesis/Sega Mega Drive/Sega CD/32X/Nomad
Sonic 1 Megamix
Sega
Japan, U.S.A., Europe
1277952 Bytes (9.7500 Mb)
Padded: No
Intro/Trainer: Maybe, 103576 Bytes
Interleaved/Swapped: Yes
Backup unit/emulator header: Yes, 512 Bytes
Japanese game name: Sonic 1 Megamix
Date: 1991.APR
Internal size: 9.7902 Mb
ROM start: 00000000
ROM end: 00139497
Cartridge RAM: Yes, 16 kBytes (backup)
RAM start: 00200000
RAM end: 00203fff
Product type: Game
I/O device(s): 3 Button Pad
Modem data:
Memo:
Product code: 00001009
Version: 1.00
Checksum: Bad, 0x6905 (calculated) != 0x640a (internal)
Search checksum (CRC32): 0x6aa31c0a
Data checksum (CRC32): 0x040126c5
Wrote backup to: sonic.bak
Wrote output to: sonic.smd
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I also tried header fixing with no luck. The original rom is version 3.0 btw (Sonic 1 Megamix_v3.0)
Thanks guys
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MottZilla
Joined: 08 Sep 2004
Posts: 765
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| Posted: Sat Apr 18, 2009 9:36 pm Post subject: |
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The ROM's header info IS bad. You need to correct it. Use a hex editor, and change at $1A4 the sequence of bytes that says 00139497 to 001FFFFF.
Next, pad the file until it is exactly 2 megabytes. Then try to convert it to SMD. It should work fine after that. If you can't do that I can throw the converted file up on a free file hosting thing. |
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SpooNMan
Joined: 31 Oct 2007
Posts: 89
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| Posted: Tue Apr 21, 2009 10:57 pm Post subject: |
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| MottZilla wrote: | The ROM's header info IS bad. You need to correct it. Use a hex editor, and change at $1A4 the sequence of bytes that says 00139497 to 001FFFFF.
Next, pad the file until it is exactly 2 megabytes. Then try to convert it to SMD. It should work fine after that. If you can't do that I can throw the converted file up on a free file hosting thing. |
Thanks for the info. I know how to hex edit, but padding to exactly 2MB I have no clue on  If it's not a big deal for you to upload the converted SMD, padded file I would really appreciate it.
Thanks,
Matt
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Chilly Willy
Joined: 08 Feb 2009
Posts: 174
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| Posted: Tue Apr 21, 2009 11:51 pm Post subject: |
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What do you need SMD format for? Ucon64 writes bin to carts, not SMD. I'm always converting FROM SMD, not TO it.  |
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SpooNMan
Joined: 31 Oct 2007
Posts: 89
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| Posted: Wed Apr 22, 2009 2:41 am Post subject: |
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| Chilly Willy wrote: | | What do you need SMD format for? Ucon64 writes bin to carts, not SMD. I'm always converting FROM SMD, not TO it. |
I have a Super Magic Drive copier (16Mbit) and a friend of mine just made a floppy drive add-on for me. I know it's a bit old fashioned to load games off of a floppy, but I like to. I figure when I finally do get an old motherboard or laptop with a parallel port, the roms should be in .SMD format anyway. I know some loaders will convert on the fly, but why convert when you have the "correct" format to start with?
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MottZilla
Joined: 08 Sep 2004
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RGB_Gamer
Joined: 01 Oct 2007
Posts: 879
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| Posted: Wed Apr 22, 2009 3:01 am Post subject: |
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| SpooNMan wrote: | | Chilly Willy wrote: | | What do you need SMD format for? Ucon64 writes bin to carts, not SMD. I'm always converting FROM SMD, not TO it. |
I have a Super Magic Drive copier (16Mbit) and a friend of mine just made a floppy drive add-on for me. I know it's a bit old fashioned to load games off of a floppy, but I like to. I figure when I finally do get an old motherboard or laptop with a parallel port, the roms should be in .SMD format anyway. I know some loaders will convert on the fly, but why convert when you have the "correct" format to start with? |
got pics on this or maybe how to make one of your own? I have an SMD that needs a floppy drive. |
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SpooNMan
Joined: 31 Oct 2007
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SpooNMan
Joined: 31 Oct 2007
Posts: 89
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| Posted: Wed Apr 22, 2009 4:32 am Post subject: |
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The only problem I have now is that 2MB won't fit on a 1.44Mb floppy
is there anyway to just convert it to smd without padding to 2MB?
Thanks
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MottZilla
Joined: 08 Sep 2004
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| Posted: Wed Apr 22, 2009 5:19 am Post subject: |
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| You need to use ucon64 with -s to split the ROM into smaller parts and then you just pick the first file and it should let you load each one so that with 2 disks you can load the full ROM. And with that you'll be able to play 2MByte games on there. |
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SpooNMan
Joined: 31 Oct 2007
Posts: 89
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| Posted: Wed Apr 22, 2009 5:45 pm Post subject: |
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| MottZilla wrote: | | You need to use ucon64 with -s to split the ROM into smaller parts and then you just pick the first file and it should let you load each one so that with 2 disks you can load the full ROM. And with that you'll be able to play 2MByte games on there. |
ok, I can do that.
So, is it the SMD format that requires full 512KB chunks? I was hoping since it was under 1.3MB to start that it could be padded, converted, then trimmed back to fit on a single disk... but it's really not that big of a deal when I think about it. I'm am a bit OCD, so I sometimes get picky. 
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madman
Joined: 07 Jul 2006
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| Posted: Thu Apr 23, 2009 6:54 am Post subject: |
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| Spoonman has been asking how to split ROM files since the mid 90s! |
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SpooNMan
Joined: 31 Oct 2007
Posts: 89
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| Posted: Fri Apr 24, 2009 1:14 am Post subject: |
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| madman wrote: | | Spoonman has been asking how to split ROM files since the mid 90s! |
Actually, that is the one thing I've never asked how to do. I have splitting and joining roms since '92. I joined, cracked, intro-removed, and converted to .smc on over 700 snes roms. Then I sold SNESDisc, the first commercially available CD full of snes roms, months before Number's collections.
What I don't know how to do is trim a rom that has been padded back to it's original size.
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MottZilla
Joined: 08 Sep 2004
Posts: 765
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| Posted: Fri Apr 24, 2009 2:04 am Post subject: |
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Anything past the original ROM size can be cut out in a hex editor if you like. The ROM was padded either with 00s or FFs I imagine. But really, just use two disks and enjoy it.  |
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LilJoe
Joined: 16 Oct 2013
Posts: 13
Location: Colorado
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| Posted: Wed Jan 01, 2014 7:14 pm Post subject: |
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Sorry for reviving such an old thread. I just bought a 16M SMD and want to play the game. but I'm having the same issue as the OP. The Megaupload posted file is now long gone too.
Does anyone one have a converted file?. Thanks for your help. |
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