Autoboot Castlevania games from Konami Collection!

Started by dACE, June 27, 2015, 01:05:41 PM

Previous topic - Next topic

dACE

I downloaded the gameboy emulator bgb (http://bgb.bircd.org/) - to help me debug my current hack Zelda: Missing Link (http://www.romhacking.net/forum/index.php/topic,19530.0.html).

This emulator has a really nice debugger and when I was finished with the modifications I needed for my hack
- I though I'll take a stab at something I (and others on this forum) have been thinking of:

Why not hack the two Konami Collections (1 & 4 in Europe) to automatically boot the Castlevania games.

So I took my new self-learned skills and got to work, and wouldn't you know it - here is how you do it:

1) First get your hands on the right versions:

Castlevania Adventure: Konami GB Collection Vol.1 (E)
Castlevania II - Belmonts Revenge: Konami GB Collection Vol.4 (E)

2) This is optional, but highly recommended: Download the speed-up patches and apply them:

Castlevania Adventure: http://www.romhacking.net/hacks/190/
Castlevania II - Belmonts Revenge: http://www.romhacking.net/hacks/213/

3) Load up the Hex-editor of your choice and change the following:

Castlevania Adventure
Offset: 1 8B5A
Replace
3E 01 EA A0 C0 EA A1 C0 3E 08 EA A1 C0
With
3E 09 EA A1 C0 3E 01 EA B0 C0 EA A0 C0

Castlevania II - Belmonts Revenge
Offset: 6 413B
Replace
3E 01 EA 0B C5 AF EA CA CC 3E 00 CD 70 49
With
3E 01 EA 0B C5 3E 02 EA A0 CC C3 75 02 00

Enjoy and let me know if you found this helpful...

/dACE

SunGodPortal

#1
I haven't had a chance to try this yet but I like the idea. I'm a Castlevania freak and still have yet to play the color versions of these two.

EDIT: Works like a charm.
Cigarettes, ice-cream, figurines of the Virgin Mary...

Jonesy47

Dude, I have actually wanted this specific hack for a while! Thank you!

Vanya

Now what about if I wanted to also remove all the other games from the ROMs? Can that be done with as much relative ease?

dACE

Thanks for the great response - I actually enjoyed making these two hacks a reality.

The first one was really easy, the second one took some more effort to get right.


As for completely remove the other games, there is a famous Swedish proverb that goes:

Det kommer att kosta mer än det smakar.

Literal translation into English:

It's going to cost more than it tastes.

Basically, the effort will overshadow the Kb's saved. That's my opinion at least.

/dACE

SunGodPortal

QuoteNow what about if I wanted to also remove all the other games from the ROMs? Can that be done with as much relative ease?

Why would anyone even WANT to do that? What would be gained from it?
Cigarettes, ice-cream, figurines of the Virgin Mary...

helaku

Hy dACE.

First of all nice hacks.
Second, can you upload a patch or something to be some easier?

Thanks!
Have at you!

M-Tee

When I firat saw this thread, I thought  it said "Autobot Castlevania" and I was slightly disapointed when I realized outherwise.

helaku

The same M-Tee
I was thinkg, what Transformers and Castlevania? ;D
Have at you!

Midna

Quote from: M-Tee on June 28, 2015, 04:40:54 AM
When I firat saw this thread, I thought  it said "Autobot Castlevania" and I was slightly disapointed when I realized outherwise.

Ah, good. Then I'm not crazy.

Vanya

Quote from: SunGodPortal on June 27, 2015, 05:30:26 PM
Why would anyone even WANT to do that? What would be gained from it?

By that logic why would anyone even want to have an autoboot hack?

And what I would gain is a neat self contained ROM of the colorized version of the games  I care about having without the other ones I don't care about.

Carnivol

This hack reminds me of how annoying it is that the Konami Collection releases in Europe calls the Contra titles for Probotector on the game selection menu, but once you boot them you're treated to what's essentially colorized Contra with Probotector title screens and not colorized Probotector :/

Bahamut ZERO

Woah, they made colored versions of those 2 Castlevania!?

Yeah, definitely trying this later. Also thanks for the links to the speed-up patch for Legends and quick-fix for Adventure. Those were both things I disliked about the originals.


Quote from: M-Tee on June 28, 2015, 04:40:54 AM
When I firat saw this thread, I thought  it said "Autobot Castlevania" and I was slightly disapointed when I realized outherwise.

Reading that makes me want to see out how the graphics are stored in these Konami Collections, as I suddenly have the urge to make a little Optimus Prime swinging a whip.    :laugh:
Like Super Mario Land? Then you'll love my first completed Rom Hack: Maniac on the Run!

KillerBob

#13
What's nice about Belmont's Revenge in this re-release is that it was treated with a new more faithful translation. However, being much more wordy than the original English and Japanese versions, I noticed the music is over before the text is even finished in the intro. I guess a little speed bump to the text could have avoided that. I also noted the intro lack the transparency/fog effect at the top and bottom edges of the screen.

The Japanese versions and this re-release uses the holy water and cross for sub-weapons. The original English release replaced the cross with the axe. I guess this was a difficulty tweak rather than censorship that some may believe, anyone who knows for sure why it was done, and does it change the gameplay in any significant way?

Rodimus Primal

#14
Works great! I was also able to undo the graphics changes made in the Castlevania Adventure speed patch restoring the Cross, Heart, and Coin graphics.

I also noticed that the code if modified can allow Konami Collection Vol 4 to select a different game instead of Belmont's Revenge. This happened when I accidentally put in a 01 instead of a 02 and it loaded Gradius II.

I can admit, I thought Autobot Castlevania as well. LOL. As a Transformers fan (PAINFULLY OBVIOUS!) I had to do a double take when reading it.

ShadowOne333

#15
AWESOME!!!

One of my all time dreams has finally been realized! :D
Thank you, dACE!

Hope you don't mind, but I already sent a Hack Submission for both games. :)
Crediting you as the creator of course!

PS: Now my dream to make standalone ROMs for the Super Mario Advance games (without the Mario Bros. game) is the only one remaining. xD

helaku

Quote from: ShadowOne333 on June 29, 2015, 11:42:39 AM
AWESOME!!!

One of my all time dreams has finally been realized! :D
Thank you, dACE!

Hope you don't mind, but I already sent a Hack Submission for both games. :)
Crediting you as the creator of course!

PS: Now my dream to make standalone ROMs for the Super Mario Advance games (without the Mario Bros. game) is the only one remaining. xD
The checksum displayed for the roms are not the correct ones.
For Belmont Revenge (Konami GB Collection Volume 4) MD5 checksum is f3414d53473e2cc43347774cc5f40495 and for Adventure (Konami GB Collection Volume 1) is 70ccaf1c458dc09b7c703191ef9b8541.
I think you have copied the checksum from dope site.
Have at you!

ShadowOne333

Quote from: helaku on July 04, 2015, 03:54:11 AM
The checksum displayed for the roms are not the correct ones.
For Belmont Revenge (Konami GB Collection Volume 4) MD5 checksum is f3414d53473e2cc43347774cc5f40495 and for Adventure (Konami GB Collection Volume 1) is 70ccaf1c458dc09b7c703191ef9b8541.
I think you have copied the checksum from dope site.
Thanks!
I just sent the submission to change the checksums for those ones. :)

helaku

Have at you!

KingMike

Quote from: Carnivol on June 28, 2015, 03:49:51 PM
This hack reminds me of how annoying it is that the Konami Collection releases in Europe calls the Contra titles for Probotector on the game selection menu, but once you boot them you're treated to what's essentially colorized Contra with Probotector title screens and not colorized Probotector :/
Those versions do some strange things.
I also notice that Probotector in the collection enables the stage select right away. Did the original EU version do that? (I know, in the original releases, it was unlocked in the Japanese version but locked with a code on the US version)
They renamed Quarth as "Block Game" which is very strange but perhaps permissible as from what I hear the original standalone version was not released in EU. However, Motocross Maniacs was renamed "Bikers" and that was originally released in EU?
"My watch says 30 chickens" Google, 2018