From 78b5695e30e4a3821844cc6bfcda003e30f740c3 Mon Sep 17 00:00:00 2001
From: aerinon <randall.rupper@gmail.com>
Date: Thu, 17 Aug 2023 13:39:18 -0600
Subject: [PATCH] Prevent cross dungeon drops Enemy drop indicator prototype

---
 doorrando/hudadditions.asm | 213 ++++++++++++++++++++++++++-----------
 keydrop/standing_items.asm | 124 +++++++++++++++++++--
 ram.asm                    |  24 ++++-
 util/utils.asm             |   2 +-
 4 files changed, 290 insertions(+), 73 deletions(-)

diff --git a/doorrando/hudadditions.asm b/doorrando/hudadditions.asm
index 83304b1..aaf6a1a 100644
--- a/doorrando/hudadditions.asm
+++ b/doorrando/hudadditions.asm
@@ -1,73 +1,156 @@
+!BlankTile = $207F
+!SlashTile = $2830
+!HyphenTile = $2405
+!PTile = $296C
+!CTile = $295F
+!RedSquare = $345E
+!BlueSquare = $2C5E
+
+!DungeonMask = $8098C0
+!EnemyDropIndicator = $7E072A
+!IndicatorAddress = $7EC790 ; used for both boss nearness and enemy drops
+!CurrentDungeonIndicator = $7EC702
+
+!KeysObtained = $7EC7A2
+!KeysSlash = $7EC7A4
+!KeysTotal = $7EC7A6
+
 DrHudOverride:
-{
-	jsl.l NewDrawHud
-	jsr HudAdditions
-	rtl
-}
+	PHB
+	SEP #$30
+	LDA.b #$7E
+	PHA
+	PLB
 
-HudAdditions:
-{
-    SEP #$10
-    LDA.l DRFlags : AND #$0008 : BNE + : JMP .end_item_count : +
-		LDA.l TotalItemCounter : PHA : CMP #1000 : !BLT +
-			JSL HexToDec4Digit_fast
-			LDX.b $04 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS ; draw 1000's digit
-			BRA .skip
-        + JSL HexToDec_fast
-        .skip
-        LDA #$207F : STA !GOAL_DRAW_ADDRESS+2 : STA !GOAL_DRAW_ADDRESS+4
-		PLA : PHA : CMP.w #100 : !BLT +
-			LDX.b $05 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+2 ; draw 100's digit
-		+ PLA : CMP.w #10 : !BLT +
-		 	LDX.b $06 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+4 ; draw 10's digit
-		+ LDX.b $07 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+6 ; draw 1's digit
-		LDA.w #$2830 : STA !GOAL_DRAW_ADDRESS+8 ; draw slash
-		LDA.l DRFlags : AND #$0100 : BNE +
-        	LDA.l MultiClientFlagsWRAM+1 : CMP #1000 : !BLT .three_digit_goal
-				JSL HexToDec4Digit_fast
-				LDX.b $04 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+10 ; draw 1000's digit
-				LDX.b $05 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+12 ; draw 100's digit
-				LDX.b $06 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+14 ; draw 10's digit
-				LDX.b $07 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+16 ; draw 1's digit
-				BRA .end_item_count
-			.three_digit_goal
-			JSL HexToDec_fast
-			LDX.b $05 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+10 ; draw 100's digit
-			LDX.b $06 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+12 ; draw 10's digit
-			LDX.b $07 : TXA : ORA.w #$2490 : STA !GOAL_DRAW_ADDRESS+14 ; draw 1's digit
-			BRA .end_item_count
-		+ LDA.w #$2405 : STA !GOAL_DRAW_ADDRESS+10 : STA !GOAL_DRAW_ADDRESS+12
-		                 STA !GOAL_DRAW_ADDRESS+14 : STA !GOAL_DRAW_ADDRESS+16
-    .end_item_count
+DRHUD_DrawItemCounter:
+    LDA.l DRFlags : AND #$08 : BNE .draw
+    JMP DRHUD_DrawIndicators
 
-	LDX $1B : BNE + : RTS : + ; Skip if outdoors
-	ldx $040c : cpx #$ff : bne + : rts : + ; Skip if not in dungeon
-	lda.l DRMode : bne + : rts : + ; Skip if not door rando
-        phb : phk : plb
-        lda CompassField : and.l $0098c0, x : beq +
-            lda.w CompassBossIndicator, x : and #$00ff : cmp $a0 : bne +
-                lda $1a : and #$0010 : beq +
-                    lda #$345e : sta $7ec790 : bra .next
-        + lda #$207f : sta $7ec790
-    .next lda.w DRMode : and #$0002 : bne + : plb : rts : +
-            lda CurrentHealth : and #$00ff : beq +
-                lda.w DungeonReminderTable, x : bra .reminder
-            + lda #$207f
-            .reminder sta $7ec702
-            + lda.w DRFlags : and #$0004 : beq .restore
-            lda MapField : and.l $0098c0, x : beq .restore
-                txa : lsr : tax
+.draw
+	REP #$30
+	LDY.w #!SlashTile : STY.w !GOAL_DRAW_ADDRESS+8
+	LDA.l TotalItemCounter : PHA
+	JSR DRHUDHex4Digit
 
-				lda.l GenericKeys : and #$00ff : bne +
-                	lda DungeonCollectedKeys, x : jsr ConvertToDisplay : sta $7ec7a2
-                	lda #$2830 : sta $7ec7a4
-                +
-                lda.w ChestKeys, x : jsr ConvertToDisplay : sta $7ec7a6
-                ; todo 4b0 no longer in use
+	LDY.w #!BlankTile ; copy these from newhud
+	LDA.b $04 : TAX : STX.w !GOAL_DRAW_ADDRESS+0
+    LDA.b $05 : TAX : STX.w !GOAL_DRAW_ADDRESS+2
+    LDA.b $06 : TAX : STX.w !GOAL_DRAW_ADDRESS+4
+    LDA.b $07 : TAX : STX.w !GOAL_DRAW_ADDRESS+6
+    PLX
+    CPX.w #1000 : BCS .leave_remaining_digits
+    STY.w !GOAL_DRAW_ADDRESS
+    CPX.w #100 : BCS .leave_remaining_digits
+	STY.w !GOAL_DRAW_ADDRESS+2
+	CPX.w #10 : BCS .leave_remaining_digits
+    STY.w !GOAL_DRAW_ADDRESS+4
+.leave_remaining_digits
+	LDA.l DRFlags+1 : LSR : BCC .real_goal
+	LDY.w #!HyphenTile : STA.w !GOAL_DRAW_ADDRESS+10 : STA.w !GOAL_DRAW_ADDRESS+12
+                       STA.w !GOAL_DRAW_ADDRESS+14 : STA.w !GOAL_DRAW_ADDRESS+16
+    BRA DRHUD_DrawIndicators
+
+.real_goal
+    REP #$30
+	LDA.l MultiClientFlagsWRAM+1 : CMP.w #1000 : BCS .four_digits
+	JSR DRHUDHex3Digit
+	LDA.b $05 : TAX : STX.w !GOAL_DRAW_ADDRESS+10
+	LDA.b $06 : TAX : STX.w !GOAL_DRAW_ADDRESS+12
+	LDA.b $07 : TAX : STX.w !GOAL_DRAW_ADDRESS+14
+	BRA DRHUD_DrawIndicators
+
+.four_digits
+	JSR DRHUDHex4Digit ; carry will be preserved
+	LDA.b $04 : TAX : STX.w !GOAL_DRAW_ADDRESS+10
+	LDA.b $05 : TAX : STX.w !GOAL_DRAW_ADDRESS+12
+	LDA.b $06 : TAX : STX.w !GOAL_DRAW_ADDRESS+14
+	LDA.b $07 : TAX : STX.w !GOAL_DRAW_ADDRESS+16
+
+DRHUD_DrawIndicators:
+	SEP #$30
+	LDA.b $1B : BNE .continue
+	JMP DRHUD_Finished
+.continue
+	LDA.b $1A : AND.b #$10 : BEQ DRHUD_EnemyDropIndicator
+
+DRHUD_BossIndicator:
+	LDA.l DRMode : BNE .continue
+.early_exit
+	JMP DRHUD_Finished
+.continue
+	LDA.w $040C : CMP.b #$1B : BCS .early_exit
+
+	SEP #$10 ; clears the high byte of X and prevents it from getting B register
+	TAX
+
+	REP #$30
+	LDY.w #!BlankTile
+	LDA.w CompassField : AND.l DungeonMask, x
+	SEP #$20
+	BEQ .draw_indicator
+    LDA.l CompassBossIndicator, x : CMP.b $A0 : BNE .draw_indicator
+    LDY.w #!RedSquare
+.draw_indicator
+    STY.w !IndicatorAddress
+	BRA DRHUD_DrawCurrentDungeonIndicator
+
+DRHUD_EnemyDropIndicator:
+	REP #$30
+	LDA.w !EnemyDropIndicator : STA.w !IndicatorAddress
+	SEP #$20
+	LDA.w $040C : CMP.b #$1B : BCS DRHUD_Finished
+	SEP #$10 : TAX : REP #$10
+
+DRHUD_DrawCurrentDungeonIndicator: ; mX
+    LDA.l DRMode : AND.b #$02 : BEQ DRHUD_Finished
+    LDY.w #!BlankTile
+    LDA.w CurrentHealth : BEQ .draw_indicator
+
+    REP #$20 : LDA.l DungeonReminderTable,X : SEP #$20
+	TAY
+.draw_indicator
+	STY.w !CurrentDungeonIndicator
+
+DRHUD_DrawKeyCounter:
+    LDA.l DRFlags : AND.b #$04 : BEQ DRHUD_Finished
+    REP #$20
+    LDA.w MapField : AND.l DungeonMask, X : BEQ DRHUD_Finished
+	TXA : LSR : TAX
+	LDA.l GenericKeys : AND.w #$00FF : BNE .total_only
+	LDA.l DungeonCollectedKeys, X : JSR ConvertToDisplay : STA.w !KeysObtained
+	LDA #!SlashTile : STA.w !KeysSlash
+.total_only
+	LDA.l ChestKeys, x : JSR ConvertToDisplay : STA.w !KeysTotal
+
+;===================================================================================================
+
+DRHUD_Finished:
+    PLB : RTL
+
+;===================================================================================================
+
+DRHUDHex3Digit:
+	JSL HexToDec_fast
+	JMP DRHUDHex4Digit_shared
+
+DRHUDHex4Digit:
+	JSL HexToDec4Digit_fast
+.shared
+	REP #$30
+	LDA.l $04
+	ORA.w #$9090
+	STA.b $04
+
+	LDA.l $06
+	ORA.w #$9090
+	STA.b $06
+	LDA.w #$2400  ; 2490
+
+	SEP #$20
+	RTS
+
+;===================================================================================================
 
-    .restore
-    plb : rts
-}
 
 ;column distance for BK/Smalls
 HudOffsets:
diff --git a/keydrop/standing_items.asm b/keydrop/standing_items.asm
index 8c04acd..e410dde 100644
--- a/keydrop/standing_items.asm
+++ b/keydrop/standing_items.asm
@@ -96,6 +96,7 @@ SpawnedItemIsMultiWorld = $7E0724 ; 0x02
 SpawnedItemFlag = $7E0726 ; 0x02 - one for pot, 2 for sprite drop
 ; (flag used as a bitmask in conjunction with StandingItemCounterMask)
 SpawnedItemMWPlayer = $7E0728 ; 0x02
+;!EnemyDropIndicator = $7E072A ; 0x02 either the blank tile or the blue square
 ; clear all of them in a loop during room load
 SprDropsItem = $7E0730 ; 0x16
 SprItemReceipt = $7E0740 ; 0x16
@@ -148,12 +149,43 @@ UWEnemyItemFlags:
 ; Reserved $250 296 * 2
 
 
-; Thoughs on multitile dungeon design
+org $A8AF00
+UWSpecialFlagIndex:
+; Reserved $128 (296)
 ; Initial table indexed by room id
 ; Special values: $FF indicates the room can use the UWEnemyItemFlags table
 ;                 Any other value tell you where to start in the special table
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
 
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+db $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF
+
+
+org $A8B028
+UWSpecialFlag:
+; reserved exactly $100 or 256 bytes for now estimated usage is at 159 bytes right now
 ; Simple mask table, 3 bytes per entry: 1st byte what dungeon it applies, if $FF, then the list is done
+; Lists that has even numbers of entries will end with $FF $FF to keep everything 2 byte aligned
+; (if not matched, assume mask of value 0)
 ; 2nd and 3rd bytes are the mask
 
 ; For indicator idea:
@@ -163,8 +195,7 @@ UWEnemyItemFlags:
 ; $FF indicates a spawn without further checking, otherwise need to check the mask in the simple table
 ; this should be checked in addition to SRAM
 
-org $A8AF00
-
+org $A8B128
 RevealPotItem:
 	STA.b $04 ; save tilemap coordinates
 	STZ.w SpawnedItemFlag
@@ -320,6 +351,7 @@ ClearSpriteData:
 			STA SprDropsItem, X :  STA SprItemReceipt, X : STA SprItemIndex, X
 			STA SprItemMWPlayer, X : STA SprItemFlags, X
 			INX : CPX #$10 : BCC .loop
+		JSR SetupEnemyDropIndicator
 	PLX
 	RTL
 
@@ -327,6 +359,49 @@ ClearSpriteData2:
 	LDA.b #$82 : STA.b $99
 	JMP ClearSpriteData_shared
 
+
+; this routine determines whether enemies still have drops or not
+; and sets EnemyDropIndicator appropriately
+; uses X register, assumes flags are (MX) but (mX) is fine
+SetupEnemyDropIndicator:
+	REP #$20
+	LDA.w #!BlankTile : STA.w !EnemyDropIndicator
+	LDX.b $1B : BEQ .done
+	; do we have a flag for enemy drops on? could check it here
+	LDA.w $040C : AND.w #$00FF : CMP.w #$00FF : BEQ .skipCompassChecks
+	; compass checks
+	; does compass for dungeon exist?
+	LSR : TAX : LDA.l ExistsTransfer, X : TAX : LDA.l CompassExists, X : BEQ .skipCompassChecks
+	; doe we have the compass
+	; todo: sewers?
+	LDA.l CompassField : LDX.w $040C : AND.l DungeonMask, X : BEQ .done
+
+.skipCompassChecks
+	; either we're in a cave ($040C: $FF), compass doesn't exist, or we have the compass
+	; check if there are enemy drops
+	LDA.b $02 : PHA : REP #$10 ; store 02/03 for later
+	LDX.b $A0 : LDA.l UWSpecialFlagIndex, X : AND.w #$00FF ; determine if special case or not
+	CMP.w #$00FF : BEQ .loadNormalFlags
+	JSR FetchBitmaskForSpecialCase
+	PHA : LDA $A0 : ASL : TAX : PLA
+	BRA .testAgainstMask
+
+.loadNormalFlags
+	TXA : ASL : TAX : LDA.l UWEnemyItemFlags, X
+
+.testAgainstMask
+	STA.b $02 : LDA.l SpritePotData, X : AND.b $02 : EOR.b $02
+	BEQ .cleanup
+	LDA.w #!BlueSquare : STA.w !EnemyDropIndicator
+
+.cleanup
+	SEP #$10 : PLA : STA.b $02
+
+.done
+SEP #$20
+RTS
+
+
 ; Runs during sprite load of the room
 LoadSpriteData:
 	INY : INY
@@ -354,7 +429,24 @@ LoadSpriteData:
 
 ; Run when a sprite dies ... Sets Flag to #$02 and Index to sprite slot for
 RevealSpriteDrop:
-	LDA.l SprDropsItem, X : BEQ .normal
+	LDA.l SprDropsItem, X : BNE CheckIfDropValid
+	JMP DoNormalDrop
+
+CheckIfDropValid:
+	REP #$30 : PHX ; save it for later
+	TXA : ASL : TAX : LDA.l BitFieldMasks, X : STA.b $00  ; stores the bitmask for the specific drop
+	; check sram, if gotten, run normal
+	LDA.b $A0 : ASL : TAX : LDA.l SpritePotData, X : PLX ; restore X in case we're done
+	BIT.b $00 : BNE DoNormalDrop ; zero indicates the item has not been obtained
+	PHX  ; save it for later
+	LDX.b $A0 : LDA.l UWSpecialFlagIndex, X : AND.w #$00FF
+	CMP.w #$00FF : BEQ + ; $FF indicates the EnemyItemFlags are sufficient
+		JSR FetchBitmaskForSpecialCase
+		BRA .test
+	+ TXA : ASL : TAX : LDA.l UWEnemyItemFlags, X
+	.test PLX : BIT.b $00 : BEQ DoNormalDrop ; zero indicates the enemy doesn't drop
+	SEP #$30
+	;This section sets up the drop
 		LDA #$02 : STA.l SpawnedItemFlag
 		STX.w SpawnedItemIndex
 		LDA.l SprItemReceipt, X : STA SpawnedItemID
@@ -377,7 +469,9 @@ RevealSpriteDrop:
 			+ INX #2 : BRA -
 		.done PLX
 		 RTL ; unstun if stunned
-	.normal
+
+DoNormalDrop:
+	SEP #$30
 	LDY.w $0CBA, X : BEQ .no_forced_drop
 		RTL
 	.no_forced_drop
@@ -396,6 +490,21 @@ RevealSpriteDrop2:
 	PEA.w $06E3CE-1 ; change return address to .no_forced_drop of (Sprite_DoTheDeath)
 	RTL
 
+; input - A the index from UWSpecialFlagIndex
+; uses X for loop, $02 for comparing first byte to dungeon
+; output - A the correct bitmask
+FetchBitmaskForSpecialCase:
+	ASL : TAX
+	LDA.w $040C : BNE +   ; could check if we are in a cave here and branch to different function?
+		INC #2 ; move sewers to HC
+	+ STA.b $02
+	- LDA.l UWSpecialFlag, X : AND.w #$00FF
+	CMP.w #$00FF : BNE +  ; if the value is FF we are done, use 0 as bitmask
+		LDA.w #$0000 : RTS
+	+  CMP.b $02 : BNE +  ; if the value matches the dungeon, use next 2 bytes as bitmasl
+		INX : LDA.l UWSpecialFlag, X : RTS
+	+ INX #3 : BRA - ; else move to the next row
+
 MinorForcedDrops:
 ; Item ID -> Sprite ID
 db $27, $DC ; BOMB REFILL 1
@@ -420,6 +529,7 @@ IncrementCountForMinor:
 	LDA.l SpritePotData, X : BIT $0A : BNE .obtained
 		ORA $0A : STA SpritePotData, X
 		SEP #$30
+		JSR SetupEnemyDropIndicator
 		LDA $040C : CMP #$FF : BEQ +
 			CMP #$00 : BNE ++
 				INC #2 ; treat sewers as HC
@@ -472,7 +582,9 @@ MarkSRAMForItem:
 		TAX : LDA.l BitFieldMasks, X : STA $00
 		TYX
 		LDA.w SpawnedItemFlag : CMP #$0001 : BEQ +
-			LDA SpritePotData, X : ORA $00 : STA SpritePotData, X : BRA .end
+			LDA SpritePotData, X : ORA $00 : STA SpritePotData, X
+			SEP #$10 : JSR SetupEnemyDropIndicator
+			BRA .end
 		+ LDA RoomPotData, X : ORA $00 : STA RoomPotData, X
 	.end
 	SEP #$30 : PLY : PLX
diff --git a/ram.asm b/ram.asm
index 3510b8f..11ff2f2 100644
--- a/ram.asm
+++ b/ram.asm
@@ -1,12 +1,26 @@
 ;================================================================================
 ; RAM Labels & Assertions
 ;--------------------------------------------------------------------------------
+pushpc
+org 0
+;--------------------------------------------------------------------------------
 ; Labels for values in WRAM and assertions that ensure they're correct and
 ; at the expected addresses. All values larger than one byte are little endian.
 ;--------------------------------------------------------------------------------
 ; Placeholder and for compass item max count allocations, still WIP
 ;--------------------------------------------------------------------------------
-CompassTotalsWRAM = $7F5410
+
+base $7F5000
+RedrawFlag: skip 1                 ;
+skip 2                             ; Unused
+HexToDecDigit1: skip 1             ; Space for storing the result of hex to decimal conversion.
+HexToDecDigit2: skip 1             ; Digits are stored from high to low.
+HexToDecDigit3: skip 1             ;
+HexToDecDigit4: skip 1             ;
+HexToDecDigit5: skip 1             ;
+
+base $7F5410
+CompassTotalsWRAM: skip $10
 
 ;================================================================================
 ; RAM Assertions
@@ -15,4 +29,12 @@ macro assertRAM(label, address)
   assert <label> = <address>, "<label> labeled at incorrect address."
 endmacro
 
+%assertRAM(RedrawFlag, $7F5000)
+%assertRAM(HexToDecDigit1, $7F5003)
+%assertRAM(HexToDecDigit2, $7F5004)
+%assertRAM(HexToDecDigit3, $7F5005)
+%assertRAM(HexToDecDigit4, $7F5006)
+%assertRAM(HexToDecDigit5, $7F5007)
 %assertRAM(CompassTotalsWRAM, $7F5410)
+
+pullpc
diff --git a/util/utils.asm b/util/utils.asm
index 32ae59f..8c21cf7 100644
--- a/util/utils.asm
+++ b/util/utils.asm
@@ -1,5 +1,5 @@
 HexToDec4Digit_fast:
-	LDY.b #$00
+	LDY.w #$0000
 	-
 		CMP.w #1000 : !BLT +
 		INY