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;; Classic Goomba, by mikeyk, edited by HuFlungDu
;;
;; Description: A classic squashable goomba that can go upside down
;;
;; Uses first extra bit: YES. If not set, he starts on top. If set, on bottom.
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; goomba init JSL
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FreeRAMTable = $1594

                    
                    dcb "INIT"
                    PHY
                    JSR SUB_HORZ_POS
                    TYA
                    STA $157C,x
					LDA $7FAB10,x
					BIT #$04
					BEQ skipflip
					LDA #$01
					STA FreeRAMTable,x
					skipflip:
                    PLY
                    RTL


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; goomba main JSL
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                    dcb "MAIN"
                    PHB                     ; \
                    PHK                     ;  | main sprite function, just calls local subroutine
                    PLB                     ;  |
                    JSR GOOMB_CODE_START    ;  |
                    PLB                     ;  |
                    RTL                     ; /


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; goomba main code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

X_SPEED             dcb $08,$F8 
KILLED_X_SPEED      dcb $F0,$10

GOOMB_CODE_START    

					
					JSR GOOMB_GRAPHICS      ; graphics routine
					LDA $15AC,x
					BEQ NotRun
					CMP #$01
					BNE NotRun
					LDA #$C0
					STA $AA,x
					LDA $1594,x
					EOR #$01
					STA $1594,x
					NotRun:
                    LDA $14C8,x             ; \ 
                    CMP #$08                ;  | if status != 8, return
                    BNE RETURN              ; /
                    JSR SUB_OFF_SCREEN_X0   ; handle off screen situation
                    LDY $157C,x             ; \ set x speed based on direction
                    LDA X_SPEED,y           ;  |
                    STA $B6,x               ; /
                    LDA $9D                 ; \ if sprites locked, return
                    BNE RETURN              ; /
                    LDA $1558,x             ; \ if sprite not defeated (timer to show remains > 0)...
                    BEQ ALIVE               ; /    ... goto ALIVE
                    STA $15D0,x             ; \ 
                    DEC A                   ;  }   if sprite remains don't disappear next frame...
                    BNE RETURN              ; /    ... return
                    STZ $14C8,x             ; this is the last frame to show remains, so set sprite status = 0 (not alive)
RETURN              RTS                     ; return                    
ALIVE               LDA $1588,x             ;A:0100 X:0007 Y:0001 D:0000 DB:03 S:01EF P:envMXdiZCHC:0276 VC:077 00 FL:623
                    AND #$04                ;A:0100 X:0007 Y:0001 D:0000 DB:03 S:01EF P:envMXdiZCHC:0308 VC:077 00 FL:623
                    PHA                     ;A:0100 X:0007 Y:0001 D:0000 DB:03 S:01EF P:envMXdiZCHC:0324 VC:077 00 FL:623
                    JSL $01802A             ; update position based on speed values
                    JSL $018032             ; interact with other sprites
                    LDA $1588,x             ;A:254B X:0007 Y:0007 D:0000 DB:03 S:01EE P:envMXdizcHC:0684 VC:085 00 FL:623
                    AND #$04                ;A:2504 X:0007 Y:0007 D:0000 DB:03 S:01EE P:envMXdizcHC:0716 VC:085 00 FL:623
                    BEQ IN_AIR              ;A:2504 X:0007 Y:0007 D:0000 DB:03 S:01EE P:envMXdizcHC:0732 VC:085 00 FL:623
                    STZ $AA,x               ;A:2504 X:0007 Y:0007 D:0000 DB:03 S:01EE P:envMXdizcHC:0748 VC:085 00 FL:623
                    PLA                     ;A:2504 X:0007 Y:0007 D:0000 DB:03 S:01EE P:envMXdizcHC:0778 VC:085 00 FL:623
                    BRA ON_GROUND           ;A:2500 X:0007 Y:0007 D:0000 DB:03 S:01EF P:envMXdiZcHC:0806 VC:085 00 FL:623
IN_AIR              PLA                     ;A:2500 X:0007 Y:0006 D:0000 DB:03 S:01EB P:envMXdiZcHC:0316 VC:085 00 FL:4955
                    BEQ WAS_IN_AIR          ;A:2504 X:0007 Y:0006 D:0000 DB:03 S:01EC P:envMXdizcHC:0344 VC:085 00 FL:4955
                    LDA #$0A                ;A:2504 X:0007 Y:0006 D:0000 DB:03 S:01EC P:envMXdizcHC:0360 VC:085 00 FL:4955
                    STA $1540,x             ;A:25FF X:0007 Y:0006 D:0000 DB:03 S:01EC P:eNvMXdizcHC:0376 VC:085 00 FL:4955
WAS_IN_AIR          LDA $1540,x             ;A:25FF X:0007 Y:0006 D:0000 DB:03 S:01EC P:eNvMXdizcHC:0408 VC:085 00 FL:4955
                    BEQ ON_GROUND           ;A:25FF X:0007 Y:0006 D:0000 DB:03 S:01EC P:eNvMXdizcHC:0440 VC:085 00 FL:4955
                    STZ $AA,x               ;A:25FF X:0007 Y:0006 D:0000 DB:03 S:01EC P:eNvMXdizcHC:0456 VC:085 00 FL:4955
ON_GROUND           
                    LDA $1588,x             ; | if sprite is in contact with an object...
                    AND #$03                ; |
                    BEQ DONT_UPDATE         ; |
                    LDA $157C,x             ; | flip the direction status
                    EOR #$01                ; |
                    STA $157C,x             ; /


DONT_UPDATE         
					LDA FreeRAMTable,x
					BEQ OnTop
					LDA $066E
					BEQ RETURN_24
					BRA Hit
					OnTop
					LDA $066E
					BNE RETURN_24
					Hit:
					JSL $01A7DC             ; check for mario/sprite contact
                    BCC RETURN_24           ; (carry set = contact)
                    LDA $1490               ; \ if mario star timer > 0 ...
                    BEQ NOT_HAS_STAR            ; /    ... goto HAS_STAR
					JMP HAS_STAR
					NOT_HAS_STAR
                    LDA $7D                 ; \  if mario's y speed < 10 ...
                    CMP #$10                ;  }   ... sprite will hurt mario
                    BMI GOOB_WINS           ; /                       
                    
MARIO_WINS          
					LDA FreeRAMTable,x
					BEQ SkipBackupPos1
					LDA $96
					STA $0A
					EOR #$FF
					SEC
					SBC #$20
					STA $96
					LDA $97
					STA $0B
					EOR #$01
					STA $97
					LDA $D8,x
					STA $0C
					EOR #$FF
					STA $D8,x
					LDA $14D4,x
					STA $0D
					EOR #$01
					STA $14D4,x
					SkipBackupPos1:
					JSR SUB_STOMP_PTS       ; give mario points
                    JSL $01AA33             ; set mario speed
                    JSL $01AB99             ; display contact graphic
                    LDA $140D               ; \  if mario is spin jumping...
                    ORA $187A               ;  }    ... or on yoshi ...
                    BNE SPIN_KILL           ; /     ... goto SPIN_KILL
                    LDA #$20                ; \     ... time to show defeated sprite = $20
                    STA $1558,x             ; / 
					LDA FreeRAMTable,x
					BEQ RETURN_24
					LDA $0A
					STA $96
					LDA $0B
					STA $97
					LDA $0C
					STA $D8,x
					LDA $0D
					STA $14D4,x
					
RETURN_24           RTS                     ; return 

GOOB_WINS           LDA $1497               ; \ if mario is invincible...
                    ORA $187A               ;  }  ... or mario on yoshi...
                    ORA $15D0,x             ; |   ...or sprite being eaten...
                    BNE RETURN2             ; /   ... return
                    JSR SUB_GET_DIR         ; \  set new sprite direction
                    TYA                     ;  }  
                    STA $157C,x             ; /
                    JSL $00F5B7             ; hurt mario
RETURN2             RTS                     ; return

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; spin and star kill (still part of above routine)
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STAR_SOUNDS         dcb $00,$13,$14,$15,$16,$17,$18,$19

SPIN_KILL           LDA #$04                ; \ status = 4 (being killed by spin jump)
                    STA $14C8,x             ; /   
                    LDA #$1F                ; \ set spin jump animation timer
                    STA $1540,x             ; /
                    JSL $07FC3B             ; show star animation
                    LDA #$08                ; \ play sound effect
                    STA $1DF9               ; /
					LDA FreeRAMTable,x
					BEQ SkipRestorePos
					LDA $0A
					STA $96
					LDA $0B
					STA $97
					LDA $0C
					STA $D8,x
					LDA $0D
					STA $14D4,x
					SkipRestorePos:
                    RTS                     ; return
HAS_STAR            LDA #$02                ; \ status = 2 (being killed by star)
                    STA $14C8,x             ; /
                    LDA #$D0                ; \ set y speed
                    STA $AA,x               ; /
                    JSR SUB_HORZ_POS        ; get new direction
                    LDA KILLED_X_SPEED,y    ; \ set x speed based on direction
                    STA $B6,x               ; /
                    INC $18D2               ; increment number consecutive enemies killed
                    LDA $18D2               ; \
                    CMP #$08                ;  | if consecutive enemies stomped >= 8, reset to 8
                    BCC NO_RESET2           ;  |
                    LDA #$08                ;  |
                    STA $18D2               ; /   
NO_RESET2           JSL $02ACE5             ; give mario points
                    LDY $18D2               ; \ 
                    CPY #$08                ;  | if consecutive enemies stomped < 8 ...
                    BCS NO_SOUND2           ;  |
                    LDA STAR_SOUNDS,y       ;  |    ... play sound effect
                    STA $1DF9               ; /
NO_SOUND2           RTS                     ; final return


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; graphics routine
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                    ;frame 1, frame 2, squashed, star killed (2 bytes each)
TILE_SIZE           dcb $02,$02,$02,$02,$00,$00,$02,$02
GOOMB_HORIZ_DISP    dcb $00,$00,$00,$00,$00,$08,$00,$00
GOOMB_VERT_DISP     dcb $00,$00,$00,$00,$00,$00,$00,$00
GOOMB_TILEMAP       dcb $88,$88,$88,$88,$EE,$EE,$88,$88
GOOMB_PROPERTIES    dcb $00,$00,$40,$40,$00,$40,$80,$80

GOOMB_GRAPHICS      
					LDA FreeRAMTable,x
					BEQ SkipBackupPos2
					LDA $D8,x
					STA $0A
					EOR #$FF
					STA $D8,x
					LDA $14D4,x
					STA $0B
					EOR #$01
					STA $14D4,x
					SkipBackupPos2:
					JSR GET_DRAW_INFO   
					LDA FreeRAMTable,x
					BEQ SkipRestorePos2
					LDA $0A
					STA $D8,x
					LDA $0B
					STA $14D4,x
					SkipRestorePos2:
                    LDA $157C,x             ; \ $02 = direction
                    STA $02                 ; / 
                    
                    LDA $14                 ;\ 
                    LSR A                   ; |
                    LSR A                   ; |
                    LSR A                   ; |
                    CLC                     ; |
                    ADC $15E9               ; |
                    AND #$01                ; |
                    ASL A
                    STA $03                 ; | $03 = index to frame start (0 or 2)
                    PHX                     ; /

                    LDA $14C8,x
                    CMP #$02
                    BNE NO_STAR
                    LDA #$06
                    STA $03    

NO_STAR             LDA $1558,x             ; \ if time to show sprite remains > 0...
                    BEQ NOT_DEAD            ; |
                    LDA #$04                ; |  $03 = 4
                    STA $03                 ; /
                    STX $15E9
NOT_DEAD
                    
                    LDX #$01                ; run loop 4 times, cuz 4 tiles per frame
LOOP_START_2        PHX                     ; push, current tile

                    TXA                     ; \ X = index of frame start + current tile
                    CLC                     ;  |
                    ADC $03                 ;  |
                    TAX                     ; /

                    PHY                     ; set tile to be 8x8 or 16x16
                    TYA                     ;
                    LSR A                   ;
                    LSR A                   ;
                    TAY                     ;
                    LDA TILE_SIZE,x         ; 
                    STA $0460,y             ;
                    PLY                     ;
                    
                    LDA $00                 ; \ tile x position = sprite x location ($00) + tile displacement
                    CLC                     ; |
                    ADC GOOMB_HORIZ_DISP,x  ; |
                    STA $0300,y             ; /
                    
                    LDA $01                 ; |
                    CLC                     ; | tile y position = sprite y location ($01) + tile displacement
                    ADC GOOMB_VERT_DISP,x   ; |
                    STA $0301,y             ; /

                    LDA GOOMB_TILEMAP,x     ; \ store tile
                    STA $0302,y             ; /

                    PHX                     ;
                    LDX $15E9               ;
                    LDA $15F6,x             ; get palette info
                    PLX                     ;
                    ORA GOOMB_PROPERTIES,x  ; flip tile if necessary
					PHX
					PHY
					LDX $15E9
					TXY
					LDX FreeRAMTable,y
					BEQ skipfliptile
					ORA #$80
					skipfliptile:
					PLY
					PLX
                    ORA $64                 ; add in tile priority of level
                    STA $0303,y             ; store tile properties

                    PLX                     ; \ pull, current tile
                    INY                     ; | increase index to sprite tile map ($300)...
                    INY                     ; |    ...we wrote 1 16x16 tile...
                    INY                     ; |    ...sprite OAM is 8x8...
                    INY                     ; |    ...so increment 4 times
                    DEX                     ; | go to next tile of frame and loop
                    BPL LOOP_START_2        ; /

                    PLX                     ; pull, X = sprite index
					LDA FreeRAMTable,x
					BEQ SkipBackupPos4
					LDA $D8,x
					PHA
					EOR #$FF
					INC
					STA $D8,x
		LDA $14D4,x
		PHA
		EOR #$01
		STA $14D4,x
		SkipBackupPos4:
                    LDY #$FF                ; \ we've already set 460 so use FF
                    LDA #$01                ; | A = number of tiles drawn - 1
                    JSL $01B7B3             ; / don't draw if offscreen
					LDA FreeRAMTable,x
		BEQ SkipRestorePos4
		PLA
		STA $14D4,x
		PLA
		STA $D8,x
		SkipRestorePos4:
                    RTS                     ; return
                    
                    
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; points routine
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SUB_STOMP_PTS       PHY                     ; 
                    LDA $1697               ; \
                    CLC                     ;  | 
                    ADC $1626,x             ; / some enemies give higher pts/1ups quicker??
                    INC $1697               ; increase consecutive enemies stomped
                    TAY                     ;
                    INY                     ;
                    CPY #$08                ; \ if consecutive enemies stomped >= 8 ...
                    BCS NO_SOUND            ; /    ... don't play sound 
                    LDA STAR_SOUNDS,y       ; \ play sound effect
                    STA $1DF9               ; /   
NO_SOUND            TYA                     ; \
                    CMP #$08                ;  | if consecutive enemies stomped >= 8, reset to 8
                    BCC NO_RESET            ;  |
                    LDA #$08                ; /
NO_RESET            JSL $02ACE5             ; give mario points
                    PLY                     ;
                    RTS                     ; return


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; routines below can be shared by all sprites.  they are ripped from original
; SMW and poorly documented
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

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; $B760 - graphics routine helper - shared
; sets off screen flags and sets index to OAM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

                    ;org $03B75C

TABLE1              dcb $0C,$1C
TABLE2              dcb $01,$02

GET_DRAW_INFO       STZ $186C,x             ; reset sprite offscreen flag, vertical
                    STZ $15A0,x             ; reset sprite offscreen flag, horizontal
                    LDA $E4,x               ; \
                    CMP $1A                 ;  | set horizontal offscreen if necessary
                    LDA $14E0,x             ;  |
                    SBC $1B                 ;  |
                    BEQ ON_SCREEN_X         ;  |
                    INC $15A0,x             ; /

ON_SCREEN_X         LDA $14E0,x             ; \
                    XBA                     ;  |
                    LDA $E4,x               ;  |
                    REP #$20                ;  |
                    SEC                     ;  |
                    SBC $1A                 ;  | mark sprite invalid if far enough off screen
                    CLC                     ;  |
                    ADC.W #$0040            ;  |
                    CMP.W #$0180            ;  |
                    SEP #$20                ;  |
                    ROL A                   ;  |
                    AND #$01                ;  |
                    STA $15C4,x             ; / 
                    BNE INVALID             ; 
                    
                    LDY #$00                ; \ set up loop:
                    LDA $1662,x             ;  | 
                    AND #$20                ;  | if not smushed (1662 & 0x20), go through loop twice
                    BEQ ON_SCREEN_LOOP      ;  | else, go through loop once
                    INY                     ; / 
ON_SCREEN_LOOP      LDA $D8,x               ; \ 
                    CLC                     ;  | set vertical offscreen if necessary
                    ADC TABLE1,y            ;  |
                    PHP                     ;  |
                    CMP $1C                 ;  | (vert screen boundry)
                    ROL $00                 ;  |
                    PLP                     ;  |
                    LDA $14D4,x             ;  | 
                    ADC #$00                ;  |
                    LSR $00                 ;  |
                    SBC $1D                 ;  |
                    BEQ ON_SCREEN_Y         ;  |
                    LDA $186C,x             ;  | (vert offscreen)
                    ORA TABLE2,y            ;  |
                    STA $186C,x             ;  |
ON_SCREEN_Y         DEY                     ;  |
                    BPL ON_SCREEN_LOOP      ; /

                    LDY $15EA,x             ; get offset to sprite OAM
                    LDA $E4,x               ; \ 
                    SEC                     ;  | 
                    SBC $1A                 ;  | $00 = sprite x position relative to screen boarder
                    STA $00                 ; / 
                    LDA $D8,x               ; \ 
                    SEC                     ;  | 
                    SBC $1C                 ;  | $01 = sprite y position relative to screen boarder
                    STA $01                 ; / 
                    RTS                     ; return

INVALID             PLA                     ; \ return from *main gfx routine* subroutine...
                    PLA                     ;  |    ...(not just this subroutine)
                    RTS                     ; /

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; $B817 - horizontal mario/sprite check - shared
; Y = 1 if mario left of sprite??
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

                    ;org $03B817                ; Y = 1 if contact

SUB_GET_DIR         LDY #$00                ;A:25D0 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:1020 VC:097 00 FL:31642
                    LDA $94                 ;A:25D0 X:0006 Y:0000 D:0000 DB:03 S:01ED P:envMXdiZCHC:1036 VC:097 00 FL:31642
                    SEC                     ;A:25F0 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizCHC:1060 VC:097 00 FL:31642
                    SBC $E4,x               ;A:25F0 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizCHC:1074 VC:097 00 FL:31642
                    STA $0F                 ;A:25F4 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1104 VC:097 00 FL:31642
                    LDA $95                 ;A:25F4 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1128 VC:097 00 FL:31642
                    SBC $14E0,x             ;A:2500 X:0006 Y:0000 D:0000 DB:03 S:01ED P:envMXdiZcHC:1152 VC:097 00 FL:31642
                    BPL LABEL16             ;A:25FF X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1184 VC:097 00 FL:31642
                    INY                     ;A:25FF X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1200 VC:097 00 FL:31642
LABEL16             RTS                     ;A:25FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:1214 VC:097 00 FL:31642

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; $B829 - vertical mario/sprite position check - shared
; Y = 1 if mario below sprite??
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

                    ;org $03B829 

SUB_VERT_POS        LDY #$00               ;A:25A1 X:0007 Y:0001 D:0000 DB:03 S:01EA P:envMXdizCHC:0130 VC:085 00 FL:924
                    LDA $96                ;A:25A1 X:0007 Y:0000 D:0000 DB:03 S:01EA P:envMXdiZCHC:0146 VC:085 00 FL:924
                    SEC                    ;A:2546 X:0007 Y:0000 D:0000 DB:03 S:01EA P:envMXdizCHC:0170 VC:085 00 FL:924
                    SBC $D8,x              ;A:2546 X:0007 Y:0000 D:0000 DB:03 S:01EA P:envMXdizCHC:0184 VC:085 00 FL:924
                    STA $0F                ;A:25D6 X:0007 Y:0000 D:0000 DB:03 S:01EA P:eNvMXdizcHC:0214 VC:085 00 FL:924
                    LDA $97                ;A:25D6 X:0007 Y:0000 D:0000 DB:03 S:01EA P:eNvMXdizcHC:0238 VC:085 00 FL:924
                    SBC $14D4,x            ;A:2501 X:0007 Y:0000 D:0000 DB:03 S:01EA P:envMXdizcHC:0262 VC:085 00 FL:924
                    BPL LABEL11            ;A:25FF X:0007 Y:0000 D:0000 DB:03 S:01EA P:eNvMXdizcHC:0294 VC:085 00 FL:924
                    INY                    ;A:25FF X:0007 Y:0000 D:0000 DB:03 S:01EA P:eNvMXdizcHC:0310 VC:085 00 FL:924
LABEL11             RTS                    ;A:25FF X:0007 Y:0001 D:0000 DB:03 S:01EA P:envMXdizcHC:0324 VC:085 00 FL:924


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; $B817 - horizontal mario/sprite check - shared
; Y = 1 if mario left of sprite??
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

                    ;org $03B817        

SUB_HORZ_POS        LDY #$00                ;A:25D0 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:1020 VC:097 00 FL:31642
                    LDA $94                 ;A:25D0 X:0006 Y:0000 D:0000 DB:03 S:01ED P:envMXdiZCHC:1036 VC:097 00 FL:31642
                    SEC                     ;A:25F0 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizCHC:1060 VC:097 00 FL:31642
                    SBC $E4,x               ;A:25F0 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizCHC:1074 VC:097 00 FL:31642
                    STA $0F                 ;A:25F4 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1104 VC:097 00 FL:31642
                    LDA $95                 ;A:25F4 X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1128 VC:097 00 FL:31642
                    SBC $14E0,x             ;A:2500 X:0006 Y:0000 D:0000 DB:03 S:01ED P:envMXdiZcHC:1152 VC:097 00 FL:31642
                    BPL LABEL16             ;A:25FF X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1184 VC:097 00 FL:31642
                    INY                     ;A:25FF X:0006 Y:0000 D:0000 DB:03 S:01ED P:eNvMXdizcHC:1200 VC:097 00 FL:31642
LABEL16             RTS                     ;A:25FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:1214 VC:097 00 FL:31642


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; $B85D - off screen processing code - shared
; sprites enter at different points
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

                    ;org $03B83B             

TABLE3              dcb $40,$B0
TABLE6              dcb $01,$FF 
TABLE4              dcb $30,$C0,$A0,$80,$A0,$40,$60,$B0 
TABLE5              dcb $01,$FF,$01,$FF,$01,$00,$01,$FF

SUB_OFF_SCREEN_X0   LDA #$06                ; \ entry point of routine determines value of $03
                    BRA STORE_03            ;  | 
SUB_OFF_SCREEN_X1   LDA #$04                ;  |
                    BRA STORE_03            ;  |
SUB_OFF_SCREEN_X2   LDA #$02                ;  |
STORE_03            STA $03                 ;  |
                    BRA START_SUB           ;  |
SUB_OFF_SCREEN_HB   STZ $03                 ; /

START_SUB           JSR SUB_IS_OFF_SCREEN   ; \ if sprite is not off screen, return
                    BEQ RETURN_2            ; /    
                    LDA $5B                 ; \  goto VERTICAL_LEVEL if vertical level
                    AND #$01                ;  |
                    BNE VERTICAL_LEVEL      ; /     
                    LDA $D8,x               ; \
                    CLC                     ;  | 
                    ADC #$50                ;  | if the sprite has gone off the bottom of the level...
                    LDA $14D4,x             ;  | (if adding 0x50 to the sprite y position would make the high byte >= 2)
                    ADC #$00                ;  | 
                    CMP #$02                ;  | 
                    BPL ERASE_SPRITE        ; /    ...erase the sprite
                    LDA $167A,x             ; \ if "process offscreen" flag is set, return
                    AND #$04                ;  |
                    BNE RETURN_2            ; /
                    LDA $13                 ; \ 
                    AND #$01                ;  | 
                    ORA $03                 ;  | 
                    STA $01                 ;  |
                    TAY                     ; /
                    LDA $1A                 ;x boundry ;A:0101 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0256 VC:090 00 FL:16953
                    CLC                     ;A:0100 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdiZcHC:0280 VC:090 00 FL:16953
                    ADC TABLE4,y            ;A:0100 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdiZcHC:0294 VC:090 00 FL:16953
                    ROL $00                 ;A:01C0 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizcHC:0326 VC:090 00 FL:16953
                    CMP $E4,x               ;x pos ;A:01C0 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizcHC:0364 VC:090 00 FL:16953
                    PHP                     ;A:01C0 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:0394 VC:090 00 FL:16953
                    LDA $1B                 ;x boundry hi ;A:01C0 X:0006 Y:0001 D:0000 DB:03 S:01EC P:eNvMXdizCHC:0416 VC:090 00 FL:16953
                    LSR $00                 ;A:0100 X:0006 Y:0001 D:0000 DB:03 S:01EC P:envMXdiZCHC:0440 VC:090 00 FL:16953
                    ADC TABLE5,y            ;A:0100 X:0006 Y:0001 D:0000 DB:03 S:01EC P:envMXdizcHC:0478 VC:090 00 FL:16953
                    PLP                     ;A:01FF X:0006 Y:0001 D:0000 DB:03 S:01EC P:eNvMXdizcHC:0510 VC:090 00 FL:16953
                    SBC $14E0,x             ;x pos high ;A:01FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:0538 VC:090 00 FL:16953
                    STA $00                 ;A:01FE X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:0570 VC:090 00 FL:16953
                    LSR $01                 ;A:01FE X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:0594 VC:090 00 FL:16953
                    BCC LABEL20             ;A:01FE X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdiZCHC:0632 VC:090 00 FL:16953
                    EOR #$80                ;A:01FE X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdiZCHC:0648 VC:090 00 FL:16953
                    STA $00                 ;A:017E X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizCHC:0664 VC:090 00 FL:16953
LABEL20             LDA $00                 ;A:017E X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizCHC:0688 VC:090 00 FL:16953
                    BPL RETURN_2            ;A:017E X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizCHC:0712 VC:090 00 FL:16953
ERASE_SPRITE        LDA $14C8,x             ; \ if sprite status < 8, permanently erase sprite
                    CMP #$08                ;  |
                    BCC KILL_SPRITE         ; /
                    LDY $161A,x             ;A:FF08 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdiZCHC:0140 VC:071 00 FL:21152
                    CPY #$FF                ;A:FF08 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizCHC:0172 VC:071 00 FL:21152
                    BEQ KILL_SPRITE         ;A:FF08 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0188 VC:071 00 FL:21152
                    LDA #$00                ; \ mark sprite to come back    A:FF08 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0204 VC:071 00 FL:21152
                    STA $1938,y             ; /                             A:FF00 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdiZcHC:0220 VC:071 00 FL:21152
KILL_SPRITE         STZ $14C8,x             ; erase sprite
RETURN_2            RTS                     ; return

VERTICAL_LEVEL      LDA $167A,x             ; \ if "process offscreen" flag is set, return
                    AND #$04                ;  |
                    BNE RETURN_2            ; /
                    LDA $13                 ; \ only handle every other frame??
                    LSR A                   ;  | 
                    BCS RETURN_2            ; /
                    AND #$01                ;A:0227 X:0006 Y:00EC D:0000 DB:03 S:01ED P:envMXdizcHC:0228 VC:112 00 FL:1142
                    STA $01                 ;A:0201 X:0006 Y:00EC D:0000 DB:03 S:01ED P:envMXdizcHC:0244 VC:112 00 FL:1142
                    TAY                     ;A:0201 X:0006 Y:00EC D:0000 DB:03 S:01ED P:envMXdizcHC:0268 VC:112 00 FL:1142
                    LDA $1C                 ;A:0201 X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0282 VC:112 00 FL:1142
                    CLC                     ;A:02BD X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizcHC:0306 VC:112 00 FL:1142
                    ADC TABLE3,y            ;A:02BD X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizcHC:0320 VC:112 00 FL:1142
                    ROL $00                 ;A:026D X:0006 Y:0001 D:0000 DB:03 S:01ED P:enVMXdizCHC:0352 VC:112 00 FL:1142
                    CMP $D8,x               ;A:026D X:0006 Y:0001 D:0000 DB:03 S:01ED P:enVMXdizCHC:0390 VC:112 00 FL:1142
                    PHP                     ;A:026D X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNVMXdizcHC:0420 VC:112 00 FL:1142
                    LDA.W $001D             ;A:026D X:0006 Y:0001 D:0000 DB:03 S:01EC P:eNVMXdizcHC:0442 VC:112 00 FL:1142
                    LSR $00                 ;A:0200 X:0006 Y:0001 D:0000 DB:03 S:01EC P:enVMXdiZcHC:0474 VC:112 00 FL:1142
                    ADC TABLE6,y            ;A:0200 X:0006 Y:0001 D:0000 DB:03 S:01EC P:enVMXdizCHC:0512 VC:112 00 FL:1142
                    PLP                     ;A:0200 X:0006 Y:0001 D:0000 DB:03 S:01EC P:envMXdiZCHC:0544 VC:112 00 FL:1142
                    SBC $14D4,x             ;A:0200 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNVMXdizcHC:0572 VC:112 00 FL:1142
                    STA $00                 ;A:02FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizcHC:0604 VC:112 00 FL:1142
                    LDY $01                 ;A:02FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizcHC:0628 VC:112 00 FL:1142
                    BEQ LABEL22             ;A:02FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0652 VC:112 00 FL:1142
                    EOR #$80                ;A:02FF X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0668 VC:112 00 FL:1142
                    STA $00                 ;A:027F X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0684 VC:112 00 FL:1142
LABEL22             LDA $00                 ;A:027F X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0708 VC:112 00 FL:1142
                    BPL RETURN_2            ;A:027F X:0006 Y:0001 D:0000 DB:03 S:01ED P:envMXdizcHC:0732 VC:112 00 FL:1142
                    BMI ERASE_SPRITE        ;A:0280 X:0006 Y:0001 D:0000 DB:03 S:01ED P:eNvMXdizCHC:0170 VC:064 00 FL:1195

SUB_IS_OFF_SCREEN   LDA $15A0,x             ; \ if sprite is on screen, accumulator = 0 
                    ORA $186C,x             ;  |  
                    RTS                     ; / return

NOP