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Details for Vertical spawn/despawn fix
SMW Patches - Vertical spawn/despawn fix
File Name: Vertical spawn/despawn fix
Added: 2017-08-15 02:01:53 AM
Authors: GreenHammerBro
Tool: Asar
Requires Free Space: Yes
Bug Fix: Yes
Featured: No
Description: This patch fixes a glitch where sprites gets despawn when (re)entering the screen vertically.
Tags: despawn, sa-1, spawn
Download: Download - 2.44 KiB
  Submit Update
Working fine on non SA-1 and SA-1. I never knew these bugs existed in first place. Nice.
Posted by: LX5 - 2017-08-15 02:01:19 AM
I've realized that smw's suboffscreen routine does not delete sprites in horizontal levels when above the level, since most sprites never ascend infinitely into the sky. This is probably nintendo added this code that had a potential bug:

Originally posted by bullet bill
CODE_019017:        B5 D8         LDA RAM_SpriteYLo,X       
CODE_019019:        38            SEC                       
CODE_01901A:        E5 1C         SBC RAM_ScreenBndryYLo    
CODE_01901C:        C9 F0         CMP.B #$F0                
CODE_01901E:        90 03         BCC CODE_019023           
CODE_019020:        9E C8 14      STZ.W $14C8,X             
Posted by: GreenHammerBro - 2017-07-25 09:41:35 PM
Cool, bullet fix bill!
Posted by: RussianMan - 2017-07-25 09:53:51 AM

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