Sonic 2 LD

is it a dissasembly? if so, then probably look for a sub that has _pal, or pal. Something to that effect.

 

Apparently yes there were GG flashcards, and people/groups dumped GG games at the time for use on them. But I've never spoken to anyone who actually had one of them... like GB cards they are probably long lost mostly.

 

Well if thats true then...

Sonic 2 GG = 10 zones x 3 acts each = 30 Acts total

Sonic 2 = 7 zones x 2 acts each + 3 Acts (Metropolis) + 3 Acts (Sky Chase, Wing Fortress, and Death Egg) = 20 Acts total.

You've got 10 Acts to spare. :D

 

That means you won't run on level size limits anymore?

Awesome!

Now you can replicate the S2 level layouts with more accuracy, using more S2LD blocks.

Let me ask something. The data type is, one byte for Sonic's starting X position, one byte for Sonic's starting Y position, one byte for max level X (probably in blocks) and one byte for max level Y (probably in blocks as well)? Or are the data in 4 bits (and therefore two bytes for the whole thing)? I'm just curious.

 

The tileset is good. The mappings are good. Looks like your level layout pointer is off. The 45 degree ramp mapping is at index 0, so that block of ramps would correspond to a run of zero bytes.

<a href="http://svn.sonicretro.org/filedetails.php?repname=CommunityDisassemblies&path=%2FSonic+2+SMS+Disassembly%2Fsrc%2Flevel_layout_initial_positions.asm" target="_blank">*nudge* *nudge* *disassembly* *wink* *wink*</a>

 

The end-of-level camera locking is actually performed by either the signpost object or the floating prison capsule object, depending on the act. The prison capsule object's code is <a href="http://svn.sonicretro.org/filedetails.php?repname=CommunityDisassemblies&path=%2FSonic+2+SMS+Disassembly%2Fsrc%2Fobject_logic%2Flogic_prison_capsule.asm" target="_blank">here</a> and the array with the camera coordinates is labelled "Data_PrisonCapsule_CameraPositions" (just over half way down). The signpost object logic is <a href="http://svn.sonicretro.org/filedetails.php?repname=CommunityDisassemblies&path=%2FSonic+2+SMS+Disassembly%2Fsrc%2Fobject_logic%2Flogic_signpost.asm" target="_blank">here</a> and the data array you're looking for is labelled "DATA_B31_BA42" (right at the bottom of the file).

Edit to add: the prison capsule logic is in bank 28 and the signpost logic is in bank 31.

 

Did the Coconuts disappear at 0:53? O_o

 

Awesome trailer. The gameplay actually seems a lot more fluid than the clunkier 8 bit titles (though maybe it's because I'm more used the Game Gear screen res).

 

I am in love with this project and I have a couple questions about it.

The Genesis can use a Master System drawing mode if I remember right. Will you be using just that, or is this just 8 bit trickery with the normal 16 bit draw mode? (which 16 bit I would guess would give you more freedom which you might want)

And, will the music be remade for the 8 bit sound chip, or will it just be the same FM chip music?