what is the hex location of the unused goggle sprite in sonic 1

Just by looking at it, though, we can easily spot the problem: when the intro was reworked, the graphics for the surfboard and its splash were removed from the PLC: This is because the graphics for these objects have not been loaded.Īs part of the setup for his intro sequence, when Sonic first starts Angel Island Zone 1, the game loads PLC $A instead of the regular AIZ1 PLC. For instance, although the big waves have somehow fixed themselves, Sonic still has a splash of garbage trailing behind him, and as he jumps off the surfboard, it too turns into a garbled mess. That alone restores most of the scrapped intro, but there are still a bunch of rough spots. Since we're going to make a lot of modifications to the game this time around, I'll put any relevant PAR codes alongside their respective snippets. Move.l #Obj_PlaneIntro,($FFFFB172).w move.l #Obj_SurfboardIntro,($FFFFB172).wĬlr.b (Level_started_flag).w clr.b (Level_started_flag).w SpawnLevelMainSprites: SpawnLevelMainSprites:Ĭmpi.w #0,(Current_zone_and_act).w cmpi.w #0,(Current_zone_and_act).wĬmpi.w #2,(Player_mode).w cmpi.w #2,(Player_mode).w We can restore the surfboard intro by simply changing which intro object is spawned at the start of the level: The presence of Sonic 2 sprites suggests that this sequence was the stage's original intro, before the plane intro seen in the final game was implemented. So what's going on? It turns out that underneath its surface, this object contains code for an alternate intro sequence to Angel Island Zone 1.

However, when a subtype of 0 is supplied, the object actually turns Sonic invisible by setting his mapping frame to zero and disables his movement and animation routines by setting bits 0 and 1 of his object_control attribute:

And since it shares its VRAM address with the Sonic object, it corrupts Sonic's appearance as soon as it spawns. When this object is spawned through debug mode, its subtype is always set to a non-zero value.

What is the hex location of the unused goggle sprite in sonic 1