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View topic - Golvellius bug: Lost Room has been found

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  • Joined: 18 Sep 1999
  • Posts: 498
  • Location: Portland, Oregon USA
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Golvellius bug: Lost Room has been found
Post Posted: Sun May 11, 2014 1:10 am
For many years, my brothers and I have been puzzled by a screen in Golvellius that appears out of place and identical to another room in the game. So, my brother (Quinntesson, author of the Genesis/SegaCD/32X emulator 'AGES') checked more deeply into it and found that there was, indeed, a bug in Golvellius where one room was inadvertently used twice. Since this bug didn't break the game, the game was shipped any way.

Today, we present you with a detailed description of the bug and a patch for Golvellius so that you can finally play this game with the proper room, as it was meant to be played.

All map locations refer to the coordinates on the following map:
http://www.smspower.org/seganotebook/golvlius/golvmap.html

The incorrect room is at C5 and is currently identical to the room layout used for room E1.

The patch also includes a fix for the cave in room H4 which has garbled graphics.

Enjoy!
golvellius_missing_room.png (24.86 KB)
missing room image (room C5)
golvellius_missing_room.png
golvellius_fixed_cave.png (25.39 KB)
fixed cave (room H4)
golvellius_fixed_cave.png
golvellius.txt (2.06 KB)
technical description
golvellius_file_compare.txt (137 B)
patch description

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  • Joined: 19 Oct 1999
  • Posts: 13773
  • Location: London
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Post Posted: Sun May 11, 2014 7:39 am
I believe it was correct in the Japanese version of the game. This ties in well with our new Hacks section, which you're welcome to add this to.
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  • Joined: 28 Sep 1999
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Post Posted: Sun May 11, 2014 1:17 pm
This is really cool! I'm very impressed with the detective work that went into determining the cause of the bug, and providing a fix as well.

Now I have a good excuse to play through Golvellius again. :D
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  • Joined: 21 Dec 2004
  • Posts: 24
  • Location: Hong Kong
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Post Posted: Mon May 12, 2014 12:31 pm
Hi everybody,

could anyone apply the patch and make the patched rom available to me? I'm running linux and am not sure any of the patchers will work on linux.

thanks a lot!
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  • Joined: 19 Oct 1999
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Post Posted: Mon May 12, 2014 4:57 pm
IPS is an ancient format, there must be patchers around. Here's a few candidates:

https://github.com/BlockoS/ips-patcher
Lunar IPS under WINE
http://zerosoft.zophar.net/jips.php with Java
It's only three bytes, patch it by hand!
Some options here, including a Perl script: http://wiki.superfamicom.org/snes/show/How+to+Use+ROM+Patches
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  • Joined: 21 Dec 2004
  • Posts: 24
  • Location: Hong Kong
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Post Posted: Tue May 13, 2014 1:25 am
Maxim wrote
IPS is an ancient format, there must be patchers around. Here's a few candidates:

https://github.com/BlockoS/ips-patcher
Lunar IPS under WINE
http://zerosoft.zophar.net/jips.php with Java
It's only three bytes, patch it by hand!
Some options here, including a Perl script: http://wiki.superfamicom.org/snes/show/How+to+Use+ROM+Patches


Thank you Maxim! BlockoS/ips-patcher did it for me :D

cheers
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  • Joined: 18 Sep 1999
  • Posts: 498
  • Location: Portland, Oregon USA
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Post Posted: Thu May 22, 2014 3:02 am
I created section for this hack here:

http://www.smspower.org/Hacks/Golvellius-SMS-Bugfix

There's also a link to this on the main Hacks page. It didn't fit into the 'Game Gear to Master System' section so I created a new one just called 'Master System'. Admins of the site can decide if that's the format they want or if it needs to be tweaked.

Thanks
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