Label and constant cleanup (#528)

* Label cleanup, add some constants instead of raw numbers

* Rename load/save game functions to be more explicit

30 files changed, 221 insertions, 214 deletions

diff --git a/constants/ram_constants.asm b/constants/ram_constants.asm
index 756aaa68..cc794133 100644
--- a/constants/ram_constants.asm
+++ b/constants/ram_constants.asm
@@ -49,6 +49,7 @@ DEF BIT_NO_PREVIOUS_MAP EQU 7
 
 ; wCurrentBoxNum
 DEF BIT_HAS_CHANGED_BOXES EQU 7
+DEF BOX_NUM_MASK EQU %01111111
 
 ; wObtainedBadges, wBeatGymFlags
 	const_def
@@ -153,3 +154,6 @@ DEF NUM_BADGES EQU const_value
 	const_def
 	const BIT_PLAYER_LOWER_Y ; 0
 	const BIT_PLAYER_LOWER_X ; 1
+
+; rLCDC
+DEF LCDC_DEFAULT EQU LCDC_ON | LCDC_WIN_9C00 | LCDC_WIN_ON | LCDC_BLOCK21 | LCDC_BG_9800 | LCDC_OBJ_8 | LCDC_OBJ_ON | LCDC_BG_ON
diff --git a/data/maps/objects/Route2Gate.asm b/data/maps/objects/Route2Gate.asm
index 6c46736d..44e4aa67 100644
--- a/data/maps/objects/Route2Gate.asm
+++ b/data/maps/objects/Route2Gate.asm
@@ -1,6 +1,6 @@
 	object_const_def
-	const_export ROUTE2_OAKS_AIDE
-	const_export ROUTE2_YOUNGSTER
+	const_export ROUTE2GATE_OAKS_AIDE
+	const_export ROUTE2GATE_YOUNGSTER
 
 Route2Gate_Object:
 	db $a ; border block
diff --git a/data/predef_pointers.asm b/data/predef_pointers.asm
index ebf81847..e6968c46 100644
--- a/data/predef_pointers.asm
+++ b/data/predef_pointers.asm
@@ -53,7 +53,7 @@ PredefPointers::
 	add_predef DoubleOrHalveSelectedStats
 	add_predef ShowPokedexMenu
 	add_predef EvolutionAfterBattle
-	add_predef SaveSAVtoSRAM0
+	add_predef SaveMainData
 	add_predef InitOpponent
 	add_predef CableClub_Run
 	add_predef DrawBadges
@@ -73,7 +73,7 @@ PredefPointers::
 	add_predef UsedCut
 	add_predef ShowPokedexData
 	add_predef WriteMonMoves
-	add_predef SaveSAV
+	add_predef SaveMenu
 	add_predef LoadSGB
 	add_predef MarkTownVisitedAndLoadMissableObjects
 	add_predef SetPartyMonTypes
@@ -90,10 +90,10 @@ PredefPointers::
 	add_predef EmptyFunc ; return immediately
 	add_predef AskName
 	add_predef PewterGuys
-	add_predef SaveSAVtoSRAM2
-	add_predef LoadSAV2
-	add_predef LoadSAV
-	add_predef SaveSAVtoSRAM1
+	add_predef SavePartyAndDexData
+	add_predef LoadPartyAndDexData
+	add_predef TryLoadSaveFile
+	add_predef SaveCurrentBoxData
 	add_predef DoInGameTradeDialogue
 	add_predef HallOfFamePC
 	add_predef DisplayDexRating
diff --git a/engine/battle/core.asm b/engine/battle/core.asm
index 28c164e5..296f9019 100644
--- a/engine/battle/core.asm
+++ b/engine/battle/core.asm
@@ -3137,30 +3137,30 @@ PlayerCalcMoveDamage:
 	jp c, .moveHitTest ; SetDamageEffects moves (e.g. Seismic Toss and Super Fang) skip damage calculation
 	call CriticalHitTest
 	call HandleCounterMove
-	jr z, handleIfPlayerMoveMissed
+	jr z, HandleIfPlayerMoveMissed
 	call GetDamageVarsForPlayerAttack
 	call CalculateDamage
-	jp z, playerCheckIfFlyOrChargeEffect ; for moves with 0 BP, skip any further damage calculation and, for now, skip MoveHitTest
+	jp z, PlayerCheckIfFlyOrChargeEffect ; for moves with 0 BP, skip any further damage calculation and, for now, skip MoveHitTest
 	               ; for these moves, accuracy tests will only occur if they are called as part of the effect itself
 	call AdjustDamageForMoveType
 	call RandomizeDamage
 .moveHitTest
 	call MoveHitTest
-handleIfPlayerMoveMissed:
+HandleIfPlayerMoveMissed:
 	ld a, [wMoveMissed]
 	and a
-	jr z, getPlayerAnimationType
+	jr z, GetPlayerAnimationType
 	ld a, [wPlayerMoveEffect]
 	sub EXPLODE_EFFECT
-	jr z, playPlayerMoveAnimation ; don't play any animation if the move missed, unless it was EXPLODE_EFFECT
-	jr playerCheckIfFlyOrChargeEffect
-getPlayerAnimationType:
+	jr z, PlayPlayerMoveAnimation ; don't play any animation if the move missed, unless it was EXPLODE_EFFECT
+	jr PlayerCheckIfFlyOrChargeEffect
+GetPlayerAnimationType:
 	ld a, [wPlayerMoveEffect]
 	and a
 	ld a, ANIMATIONTYPE_BLINK_ENEMY_MON_SPRITE ; move has no effect other than dealing damage
-	jr z, playPlayerMoveAnimation
+	jr z, PlayPlayerMoveAnimation
 	ld a, ANIMATIONTYPE_SHAKE_SCREEN_HORIZONTALLY_LIGHT ; move has effect
-playPlayerMoveAnimation:
+PlayPlayerMoveAnimation:
 	push af
 	ld a, [wPlayerBattleStatus2]
 	bit HAS_SUBSTITUTE_UP, a
@@ -3179,7 +3179,7 @@ playPlayerMoveAnimation:
 	ld b, BANK(ReshowSubstituteAnim)
 	call nz, Bankswitch
 	jr MirrorMoveCheck
-playerCheckIfFlyOrChargeEffect:
+PlayerCheckIfFlyOrChargeEffect:
 	ld c, 30
 	call DelayFrames
 	ld a, [wPlayerMoveEffect]
@@ -3246,7 +3246,7 @@ MirrorMoveCheck:
 	ld a, [wPlayerNumAttacksLeft]
 	dec a
 	ld [wPlayerNumAttacksLeft], a
-	jp nz, getPlayerAnimationType ; for multi-hit moves, apply attack until PlayerNumAttacksLeft hits 0 or the enemy faints.
+	jp nz, GetPlayerAnimationType ; for multi-hit moves, apply attack until PlayerNumAttacksLeft hits 0 or the enemy faints.
 	                             ; damage calculation and accuracy tests only happen for the first hit
 	res ATTACKING_MULTIPLE_TIMES, [hl] ; clear attacking multiple times status when all attacks are over
 	ld hl, MultiHitText
@@ -3523,7 +3523,7 @@ CheckPlayerStatusConditions:
 	ld [hl], a
 	ld a, BIDE
 	ld [wPlayerMoveNum], a
-	ld hl, handleIfPlayerMoveMissed ; skip damage calculation, DecrementPP and MoveHitTest
+	ld hl, HandleIfPlayerMoveMissed ; skip damage calculation, DecrementPP and MoveHitTest
 	jp .returnToHL
 
 .ThrashingAboutCheck
@@ -3557,7 +3557,7 @@ CheckPlayerStatusConditions:
 	ld a, [wPlayerNumAttacksLeft]
 	dec a ; did multi-turn move end?
 	ld [wPlayerNumAttacksLeft], a
-	ld hl, getPlayerAnimationType ; if it didn't, skip damage calculation (deal damage equal to last hit),
+	ld hl, GetPlayerAnimationType ; if it didn't, skip damage calculation (deal damage equal to last hit),
 	                ; DecrementPP and MoveHitTest
 	jp nz, .returnToHL
 	jp .returnToHL
@@ -5567,7 +5567,7 @@ RandomizeDamage:
 .loop
 	call BattleRandom
 	rrca
-	cp 217
+	cp 85 percent + 1
 	jr c, .loop
 	ldh [hMultiplier], a
 	call Multiply ; multiply damage by the random number, which is in the range [217, 255]
@@ -5660,7 +5660,7 @@ EnemyCalcMoveDamage:
 	jp c, EnemyMoveHitTest
 	call CriticalHitTest
 	call HandleCounterMove
-	jr z, handleIfEnemyMoveMissed
+	jr z, HandleIfEnemyMoveMissed
 	call SwapPlayerAndEnemyLevels
 	call GetDamageVarsForEnemyAttack
 	call SwapPlayerAndEnemyLevels
@@ -5671,13 +5671,13 @@ EnemyCalcMoveDamage:
 
 EnemyMoveHitTest:
 	call MoveHitTest
-handleIfEnemyMoveMissed:
+HandleIfEnemyMoveMissed:
 	ld a, [wMoveMissed]
 	and a
 	jr z, .moveDidNotMiss
 	ld a, [wEnemyMoveEffect]
 	cp EXPLODE_EFFECT
-	jr z, handleExplosionMiss
+	jr z, HandleExplosionMiss
 	jr EnemyCheckIfFlyOrChargeEffect
 .moveDidNotMiss
 	call SwapPlayerAndEnemyLevels
@@ -5686,13 +5686,13 @@ GetEnemyAnimationType:
 	ld a, [wEnemyMoveEffect]
 	and a
 	ld a, ANIMATIONTYPE_SHAKE_SCREEN_VERTICALLY
-	jr z, playEnemyMoveAnimation
+	jr z, PlayEnemyMoveAnimation
 	ld a, ANIMATIONTYPE_SHAKE_SCREEN_HORIZONTALLY_HEAVY
-	jr playEnemyMoveAnimation
-handleExplosionMiss:
+	jr PlayEnemyMoveAnimation
+HandleExplosionMiss:
 	call SwapPlayerAndEnemyLevels
 	xor a
-playEnemyMoveAnimation:
+PlayEnemyMoveAnimation:
 	push af
 	ld a, [wEnemyBattleStatus2]
 	bit HAS_SUBSTITUTE_UP, a ; does mon have a substitute?
@@ -6031,7 +6031,7 @@ CheckEnemyStatusConditions:
 	ld a, BIDE
 	ld [wEnemyMoveNum], a
 	call SwapPlayerAndEnemyLevels
-	ld hl, handleIfEnemyMoveMissed ; skip damage calculation, DecrementPP and MoveHitTest
+	ld hl, HandleIfEnemyMoveMissed ; skip damage calculation, DecrementPP and MoveHitTest
 	jp .enemyReturnToHL
 .checkIfThrashingAbout
 	bit THRASHING_ABOUT, [hl] ; is mon using thrash or petal dance?
@@ -6881,12 +6881,12 @@ _InitBattleCommon:
 	call PrintText
 	call SaveScreenTilesToBuffer1
 	call ClearScreen
-	ld a, $98
+	ld a, HIGH(vBGMap0)
 	ldh [hAutoBGTransferDest + 1], a
 	ld a, $1
 	ldh [hAutoBGTransferEnabled], a
 	call Delay3
-	ld a, $9c
+	ld a, HIGH(vBGMap1)
 	ldh [hAutoBGTransferDest + 1], a
 	call LoadScreenTilesFromBuffer1
 	hlcoord 9, 7
diff --git a/engine/battle/effects.asm b/engine/battle/effects.asm
index a3a552e7..e111f783 100644
--- a/engine/battle/effects.asm
+++ b/engine/battle/effects.asm
@@ -7,9 +7,9 @@ _JumpMoveEffect:
 	ldh a, [hWhoseTurn]
 	and a
 	ld a, [wPlayerMoveEffect]
-	jr z, .next1
+	jr z, .next
 	ld a, [wEnemyMoveEffect]
-.next1
+.next
 	dec a ; subtract 1, there is no special effect for 00
 	add a ; x2, 16bit pointers
 	ld hl, MoveEffectPointerTable
@@ -680,14 +680,14 @@ UpdateLoweredStatDone:
 	call PrintStatText
 	pop de
 	ld a, [de]
-	cp $44
+	cp ATTACK_DOWN_SIDE_EFFECT ; for all side effects, move animation has already played, skip it
 	jr nc, .ApplyBadgeBoostsAndStatusPenalties
 	call PlayCurrentMoveAnimation2
 .ApplyBadgeBoostsAndStatusPenalties
 	ldh a, [hWhoseTurn]
 	and a
 	call nz, ApplyBadgeStatBoosts ; whenever the player uses a stat-down move, badge boosts get reapplied again to every stat,
-	                              ; even to those not affected by the stat-up move (will be boosted further)
+	                              ; even to those not affected by the stat-down move (will be boosted further)
 	ld hl, MonsStatsFellText
 	call PrintText
 
@@ -1438,9 +1438,9 @@ CheckTargetSubstitute:
 	ld hl, wEnemyBattleStatus2
 	ldh a, [hWhoseTurn]
 	and a
-	jr z, .next1
+	jr z, .next
 	ld hl, wPlayerBattleStatus2
-.next1
+.next
 	bit HAS_SUBSTITUTE_UP, [hl]
 	pop hl
 	ret
diff --git a/engine/events/give_pokemon.asm b/engine/events/give_pokemon.asm
index 9e80bdfc..640a3dba 100644
--- a/engine/events/give_pokemon.asm
+++ b/engine/events/give_pokemon.asm
@@ -20,7 +20,7 @@ _GivePokemon::
 	callfar SendNewMonToBox
 	ld hl, wStringBuffer
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	cp 9
 	jr c, .singleDigitBoxNum
 	sub 9
diff --git a/engine/events/prize_menu.asm b/engine/events/prize_menu.asm
index c73d7ab8..15b991ed 100644
--- a/engine/events/prize_menu.asm
+++ b/engine/events/prize_menu.asm
@@ -2,12 +2,12 @@ CeladonPrizeMenu::
 	ld b, COIN_CASE
 	call IsItemInBag
 	jr nz, .havingCoinCase
-	ld hl, RequireCoinCaseTextPtr
+	ld hl, RequireCoinCaseText
 	jp PrintText
 .havingCoinCase
 	ld hl, wStatusFlags5
 	set BIT_NO_TEXT_DELAY, [hl]
-	ld hl, ExchangeCoinsForPrizesTextPtr
+	ld hl, ExchangeCoinsForPrizesText
 	call PrintText
 ; the following are the menu settings
 	xor a
@@ -28,7 +28,7 @@ CeladonPrizeMenu::
 	call TextBoxBorder
 	call GetPrizeMenuId
 	call UpdateSprites
-	ld hl, WhichPrizeTextPtr
+	ld hl, WhichPrizeText
 	call PrintText
 	call HandleMenuInput ; menu choice handler
 	bit B_PAD_B, a
@@ -42,16 +42,16 @@ CeladonPrizeMenu::
 	res BIT_NO_TEXT_DELAY, [hl]
 	ret
 
-RequireCoinCaseTextPtr:
+RequireCoinCaseText:
 	text_far _RequireCoinCaseText
 	text_waitbutton
 	text_end
 
-ExchangeCoinsForPrizesTextPtr:
+ExchangeCoinsForPrizesText:
 	text_far _ExchangeCoinsForPrizesText
 	text_end
 
-WhichPrizeTextPtr:
+WhichPrizeText:
 	text_far _WhichPrizeText
 	text_end
 
diff --git a/engine/gfx/palettes.asm b/engine/gfx/palettes.asm
index 429d8123..0497f74a 100644
--- a/engine/gfx/palettes.asm
+++ b/engine/gfx/palettes.asm
@@ -523,15 +523,15 @@ CopyGfxToSuperNintendoVRAM:
 	call CopySGBBorderTiles
 	jr .next
 .notCopyingTileData
-	ld bc, $1000
+	ld bc, 256 tiles
 	call CopyData
 .next
 	ld hl, vBGMap0
-	ld de, $c
+	ld de, TILEMAP_WIDTH - SCREEN_WIDTH
 	ld a, $80
-	ld c, $d
+	ld c, (256 + SCREEN_WIDTH - 1) / SCREEN_WIDTH ; enough rows to fit 256 tiles
 .loop
-	ld b, $14
+	ld b, SCREEN_WIDTH
 .innerLoop
 	ld [hli], a
 	inc a
@@ -540,7 +540,7 @@ CopyGfxToSuperNintendoVRAM:
 	add hl, de
 	dec c
 	jr nz, .loop
-	ld a, $e3
+	ld a, LCDC_DEFAULT
 	ldh [rLCDC], a
 	pop hl
 	call SendSGBPacket
diff --git a/engine/link/cable_club.asm b/engine/link/cable_club.asm
index 872e9b9c..a4307532 100644
--- a/engine/link/cable_club.asm
+++ b/engine/link/cable_club.asm
@@ -861,7 +861,7 @@ TradeCenter_Trade:
 	hlcoord 1, 14
 	ld de, TradeCompleted
 	call PlaceString
-	predef SaveSAVtoSRAM2
+	predef SavePartyAndDexData ; this allows reset into Pokecenter
 	vc_hook Trade_save_game_end
 	ld c, 50
 	call DelayFrames
diff --git a/engine/link/cable_club_npc.asm b/engine/link/cable_club_npc.asm
index 19e59eca..2c458b59 100644
--- a/engine/link/cable_club_npc.asm
+++ b/engine/link/cable_club_npc.asm
@@ -64,7 +64,7 @@ CableClubNPC::
 	and a
 	jr nz, .choseNo
 	vc_hook Wireless_TryQuickSave_block_input
-	callfar SaveSAVtoSRAM
+	callfar SaveGameData
 	call WaitForSoundToFinish
 	ld a, SFX_SAVE
 	call PlaySoundWaitForCurrent
diff --git a/engine/menus/display_text_id_init.asm b/engine/menus/display_text_id_init.asm
index 2ef1cfb1..f8bd6512 100644
--- a/engine/menus/display_text_id_init.asm
+++ b/engine/menus/display_text_id_init.asm
@@ -69,7 +69,7 @@ DisplayTextIDInit::
 	add hl, de
 	dec c
 	jr nz, .spriteStandStillLoop
-	ld b, $9c ; window background address
+	ld b, HIGH(vBGMap1)
 	call CopyScreenTileBufferToVRAM ; transfer background in WRAM to VRAM
 	xor a
 	ldh [hWY], a ; put the window on the screen
diff --git a/engine/menus/main_menu.asm b/engine/menus/main_menu.asm
index a3fe6587..c6f8547b 100644
--- a/engine/menus/main_menu.asm
+++ b/engine/menus/main_menu.asm
@@ -8,7 +8,7 @@ MainMenu:
 	call CheckForPlayerNameInSRAM
 	jr nc, .mainMenuLoop
 
-	predef LoadSAV
+	predef TryLoadSaveFile
 
 .mainMenuLoop
 	ld c, 20
@@ -701,8 +701,9 @@ CheckForPlayerNameInSRAM:
 ; in carry.
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK(sPlayerName) == BMODE_ADVANCED
 	ld [rRAMB], a
 	ld b, NAME_LENGTH
 	ld hl, sPlayerName
diff --git a/engine/menus/save.asm b/engine/menus/save.asm
index fba1dc53..7112207f 100644
--- a/engine/menus/save.asm
+++ b/engine/menus/save.asm
@@ -1,16 +1,15 @@
-LoadSAV:
-; if carry, write "the file data is destroyed"
+TryLoadSaveFile:
 	call ClearScreen
 	call LoadFontTilePatterns
 	call LoadTextBoxTilePatterns
-	call LoadSAV0
+	call LoadMainData
 	jr c, .badsum
-	call LoadSAV1
+	call LoadCurrentBoxData
 	jr c, .badsum
-	call LoadSAV2
+	call LoadPartyAndDexData
 	jr c, .badsum
 	ld a, $2 ; good checksum
-	jr .goodsum
+	jr .done
 .badsum
 	ld hl, wStatusFlags5
 	push hl
@@ -22,7 +21,7 @@ LoadSAV:
 	pop hl
 	res BIT_NO_TEXT_DELAY, [hl]
 	ld a, $1 ; bad checksum
-.goodsum
+.done
 	ld [wSaveFileStatus], a
 	ret
 
@@ -30,33 +29,34 @@ FileDataDestroyedText:
 	text_far _FileDataDestroyedText
 	text_end
 
-LoadSAV0:
+LoadMainData:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
 ; This vc_hook does not have to be in any particular location.
 ; It is defined here because it refers to the same labels as the two lines below.
 	vc_hook Unknown_save_limit
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld c, a
 	ld a, [sMainDataCheckSum]
 	cp c
-	jp z, .checkSumsMatched
+	jp z, .checkSumMatched
 
 ; If the computed checksum didn't match the saved on, try again.
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld c, a
 	ld a, [sMainDataCheckSum]
 	cp c
-	jp nz, SAVBadCheckSum
+	jp nz, CheckSumFailed
 
-.checkSumsMatched
+.checkSumMatched
 	ld hl, sPlayerName
 	ld de, wPlayerName
 	ld bc, NAME_LENGTH
@@ -73,46 +73,51 @@ LoadSAV0:
 	call CopyData
 	ld a, [sTileAnimations]
 	ldh [hTileAnimations], a
+
+; this part is redundant, LoadCurrentBoxData is always called next
 	ld hl, sCurBoxData
 	ld de, wBoxDataStart
 	ld bc, wBoxDataEnd - wBoxDataStart
 	call CopyData
+
 	and a
-	jp SAVGoodChecksum
+	jp GoodCheckSum
 
-LoadSAV1:
+LoadCurrentBoxData:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld c, a
 	ld a, [sMainDataCheckSum]
 	cp c
-	jr nz, SAVBadCheckSum
+	jr nz, CheckSumFailed
 	ld hl, sCurBoxData
 	ld de, wBoxDataStart
 	ld bc, wBoxDataEnd - wBoxDataStart
 	call CopyData
 	and a
-	jp SAVGoodChecksum
+	jp GoodCheckSum
 
-LoadSAV2:
+LoadPartyAndDexData:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld c, a
 	ld a, [sMainDataCheckSum]
 	cp c
-	jp nz, SAVBadCheckSum
+	jp nz, CheckSumFailed
 	ld hl, sPartyData
 	ld de, wPartyDataStart
 	ld bc, wPartyDataEnd - wPartyDataStart
@@ -122,40 +127,43 @@ LoadSAV2:
 	ld bc, wPokedexSeenEnd - wPokedexOwned
 	call CopyData
 	and a
-	jp SAVGoodChecksum
+	jp GoodCheckSum
 
-SAVBadCheckSum:
+CheckSumFailed:
 	scf
+	; fallthrough
 
-SAVGoodChecksum:
-	ld a, $0
+GoodCheckSum:
+	ld a, BMODE_SIMPLE ; preserve flags
 	ld [rBMODE], a
+	ASSERT RAMG_SRAM_DISABLE == BMODE_SIMPLE
 	ld [rRAMG], a
 	ret
 
-LoadSAVIgnoreBadCheckSum:
-; unused function that loads save data and ignores bad checksums
-	call LoadSAV0
-	call LoadSAV1
-	jp LoadSAV2
+TryLoadSaveFileIgnoreChecksum: ; unreferenced
+; don't update wSaveFileStatus upon success or failure
+; don't display warning in case of failed checksum
+	call LoadMainData
+	call LoadCurrentBoxData
+	jp LoadPartyAndDexData
 
-SaveSAV:
+SaveMenu:
 	farcall PrintSaveScreenText
 	ld hl, WouldYouLikeToSaveText
-	call SaveSAVConfirm
+	call SaveTheGame_YesOrNo
 	and a   ;|0 = Yes|1 = No|
 	ret nz
 	ld a, [wSaveFileStatus]
 	dec a
 	jr z, .save
-	call SAVCheckRandomID
+	call CheckPreviousSaveFile
 	jr z, .save
 	ld hl, OlderFileWillBeErasedText
-	call SaveSAVConfirm
+	call SaveTheGame_YesOrNo
 	and a
 	ret nz
 .save
-	call SaveSAVtoSRAM
+	call SaveGameData
 	hlcoord 1, 13
 	lb bc, 4, 18
 	call ClearScreenArea
@@ -175,13 +183,13 @@ SaveSAV:
 NowSavingString:
 	db "Now saving...@"
 
-SaveSAVConfirm:
+SaveTheGame_YesOrNo:
 	call PrintText
 	hlcoord 0, 7
 	lb bc, 8, 1
 	ld a, TWO_OPTION_MENU
 	ld [wTextBoxID], a
-	call DisplayTextBoxID ; yes/no menu
+	call DisplayTextBoxID
 	ld a, [wCurrentMenuItem]
 	ret
 
@@ -197,12 +205,14 @@ OlderFileWillBeErasedText:
 	text_far _OlderFileWillBeErasedText
 	text_end
 
-SaveSAVtoSRAM0:
+SaveMainData:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
+
 	ld hl, wPlayerName
 	ld de, sPlayerName
 	ld bc, NAME_LENGTH
@@ -216,26 +226,29 @@ SaveSAVtoSRAM0:
 	ld bc, wSpriteDataEnd - wSpriteDataStart
 	call CopyData
 	ld hl, wBoxDataStart
+
+; this part is redundant, SaveCurrentBoxData is always called next
 	ld de, sCurBoxData
 	ld bc, wBoxDataEnd - wBoxDataStart
 	call CopyData
 	ldh a, [hTileAnimations]
 	ld [sTileAnimations], a
+
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld [sMainDataCheckSum], a
 	xor a
 	ld [rBMODE], a
 	ld [rRAMG], a
 	ret
 
-SaveSAVtoSRAM1:
-; stored pokémon
+SaveCurrentBoxData:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
 	ld hl, wBoxDataStart
 	ld de, sCurBoxData
@@ -243,18 +256,19 @@ SaveSAVtoSRAM1:
 	call CopyData
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld [sMainDataCheckSum], a
 	xor a
 	ld [rBMODE], a
 	ld [rRAMG], a
 	ret
 
-SaveSAVtoSRAM2:
+SavePartyAndDexData:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
 	ld hl, wPartyDataStart
 	ld de, sPartyData
@@ -266,21 +280,21 @@ SaveSAVtoSRAM2:
 	call CopyData
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld [sMainDataCheckSum], a
 	xor a
 	ld [rBMODE], a
 	ld [rRAMG], a
 	ret
 
-SaveSAVtoSRAM::
+SaveGameData::
 	ld a, $2
 	ld [wSaveFileStatus], a
-	call SaveSAVtoSRAM0
-	call SaveSAVtoSRAM1
-	jp SaveSAVtoSRAM2
+	call SaveMainData
+	call SaveCurrentBoxData
+	jp SavePartyAndDexData
 
-SAVCheckSum:
+CalcCheckSum:
 ;Check Sum (result[1 byte] is complemented)
 	ld d, 0
 .loop
@@ -303,7 +317,7 @@ CalcIndividualBoxCheckSums:
 	push bc
 	push de
 	ld bc, wBoxDataEnd - wBoxDataStart
-	call SAVCheckSum
+	call CalcCheckSum
 	pop de
 	ld [de], a
 	inc de
@@ -317,7 +331,7 @@ GetBoxSRAMLocation:
 ; out: b = box SRAM bank, hl = pointer to start of box
 	ld hl, BoxSRAMPointerTable
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	cp NUM_BOXES / 2
 	ld b, 2
 	jr c, .next
@@ -379,7 +393,7 @@ ChangeBox::
 	ld a, [hl]
 	ld [de], a
 	call RestoreMapTextPointer
-	call SaveSAVtoSRAM
+	call SaveGameData
 	ld hl, wChangeBoxSavedMapTextPointer
 	call SetMapTextPointer
 	ld a, SFX_SAVE
@@ -396,7 +410,7 @@ CopyBoxToOrFromSRAM:
 	push hl
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
 	ld a, b
 	ld [rRAMB], a
@@ -404,7 +418,7 @@ CopyBoxToOrFromSRAM:
 	call CopyData
 	pop hl
 
-; mark the memory that the box was copied from as am empty box
+; mark the source box as an empty box
 	xor a
 	ld [hli], a
 	dec a
@@ -412,7 +426,7 @@ CopyBoxToOrFromSRAM:
 
 	ld hl, sBox1 ; sBox7
 	ld bc, sBank2AllBoxesChecksum - sBox1
-	call SAVCheckSum
+	call CalcCheckSum
 	ld [sBank2AllBoxesChecksum], a ; sBank3AllBoxesChecksum
 	call CalcIndividualBoxCheckSums
 	xor a
@@ -434,7 +448,7 @@ DisplayChangeBoxMenu:
 	xor a
 	ld [wMenuWatchMovingOutOfBounds], a
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	ld [wCurrentMenuItem], a
 	ld [wLastMenuItem], a
 	hlcoord 0, 0
@@ -455,7 +469,7 @@ DisplayChangeBoxMenu:
 	ld hl, hUILayoutFlags
 	res BIT_SINGLE_SPACED_LINES, [hl]
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	cp 9
 	jr c, .singleDigitBoxNum
 	sub 9
@@ -474,7 +488,7 @@ DisplayChangeBoxMenu:
 	hlcoord 18, 1
 	ld de, wBoxMonCounts
 	ld bc, SCREEN_WIDTH
-	ld a, $c
+	ld a, NUM_BOXES
 .loop
 	push af
 	ld a, [de]
@@ -517,12 +531,12 @@ EmptyAllSRAMBoxes:
 ; player changes the box)
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
-	ld a, 2
+	ld a, BANK("Saved Boxes 1")
 	ld [rRAMB], a
 	call EmptySRAMBoxesInBank
-	ld a, 3
+	ld a, BANK("Saved Boxes 2")
 	ld [rRAMB], a
 	call EmptySRAMBoxesInBank
 	xor a
@@ -546,7 +560,7 @@ EmptySRAMBoxesInBank:
 	call EmptySRAMBox
 	ld hl, sBox1 ; sBox7
 	ld bc, sBank2AllBoxesChecksum - sBox1
-	call SAVCheckSum
+	call CalcCheckSum
 	ld [sBank2AllBoxesChecksum], a ; sBank3AllBoxesChecksum
 	call CalcIndividualBoxCheckSums
 	ret
@@ -563,12 +577,12 @@ GetMonCountsForAllBoxes:
 	push hl
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
-	ld a, $2
+	ld a, BANK("Saved Boxes 1")
 	ld [rRAMB], a
 	call GetMonCountsForBoxesInBank
-	ld a, $3
+	ld a, BANK("Saved Boxes 2")
 	ld [rRAMB], a
 	call GetMonCountsForBoxesInBank
 	xor a
@@ -578,7 +592,7 @@ GetMonCountsForAllBoxes:
 
 ; copy the count for the current box from WRAM
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	ld c, a
 	ld b, 0
 	add hl, bc
@@ -602,25 +616,26 @@ GetMonCountsForBoxesInBank:
 	ld [hli], a
 	ret
 
-SAVCheckRandomID:
-; checks if Sav file is the same by checking player's name 1st letter
-; and the two random numbers generated at game beginning
-; (which are stored at wPlayerID)s
-	ld a, $0a
+; check if we're trying to save over a different playthrough
+; return result in zero flag
+; z set: a valid save file was found, and saved PlayerID is different from wPlayerID
+CheckPreviousSaveFile:
+	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $01
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
+	ASSERT BANK("Save Data") == BMODE_ADVANCED
 	ld [rRAMB], a
 	ld a, [sPlayerName]
 	and a
 	jr z, .next
 	ld hl, sGameData
 	ld bc, sGameDataEnd - sGameData
-	call SAVCheckSum
+	call CalcCheckSum
 	ld c, a
 	ld a, [sMainDataCheckSum]
 	cp c
-	jr nz, .next
+	jr nz, .next ; return z set if save data is corrupted
 	ld hl, sMainData + (wPlayerID - wMainDataStart) ; player ID
 	ld a, [hli]
 	ld h, [hl]
@@ -631,8 +646,9 @@ SAVCheckRandomID:
 	ld a, [wPlayerID + 1]
 	cp h
 .next
-	ld a, $00
+	ld a, BMODE_SIMPLE
 	ld [rBMODE], a
+	ASSERT RAMG_SRAM_DISABLE == BMODE_SIMPLE
 	ld [rRAMG], a
 	ret
 
@@ -674,7 +690,7 @@ LoadHallOfFameTeams:
 HallOfFame_Copy:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
 	xor a
 	ld [rRAMB], a
@@ -684,25 +700,26 @@ HallOfFame_Copy:
 	ld [rRAMG], a
 	ret
 
-ClearSAV:
+; Fill SRAM with $ff, erasing save data. Used by DoClearSaveDialogue
+ClearAllSRAMBanks:
 	ld a, RAMG_SRAM_ENABLE
 	ld [rRAMG], a
-	ld a, $1
+	ld a, BMODE_ADVANCED
 	ld [rBMODE], a
 	xor a
-	call PadSRAM_FF
-	ld a, $1
-	call PadSRAM_FF
-	ld a, $2
-	call PadSRAM_FF
-	ld a, $3
-	call PadSRAM_FF
+	call .PadSRAM_FF
+	ld a, 1
+	call .PadSRAM_FF
+	ld a, 2
+	call .PadSRAM_FF
+	ld a, 3
+	call .PadSRAM_FF
 	xor a
 	ld [rBMODE], a
 	ld [rRAMG], a
 	ret
 
-PadSRAM_FF:
+.PadSRAM_FF
 	ld [rRAMB], a
 	ld hl, STARTOF(SRAM)
 	ld bc, SIZEOF(SRAM)
diff --git a/engine/menus/start_sub_menus.asm b/engine/menus/start_sub_menus.asm
index 65f0b26e..e845941f 100644
--- a/engine/menus/start_sub_menus.asm
+++ b/engine/menus/start_sub_menus.asm
@@ -1,6 +1,6 @@
 StartMenu_Pokedex::
 	predef ShowPokedexMenu
-	call LoadScreenTilesFromBuffer2 ; restore saved screen
+	call LoadScreenTilesFromBuffer2
 	call Delay3
 	call LoadGBPal
 	call UpdateSprites
@@ -63,7 +63,7 @@ StartMenu_Pokemon::
 	ld [hl], a
 	call HandleMenuInput
 	push af
-	call LoadScreenTilesFromBuffer1 ; restore saved screen
+	call LoadScreenTilesFromBuffer1
 	pop af
 	bit B_PAD_B, a
 	jp nz, .loop
@@ -117,7 +117,7 @@ StartMenu_Pokemon::
 	ld a, [hli]
 	ld h, [hl]
 	ld l, a
-	ld a, [wObtainedBadges] ; badges obtained
+	ld a, [wObtainedBadges]
 	jp hl
 .outOfBattleMovePointers
 	dw .cut
@@ -286,7 +286,7 @@ StartMenu_Pokemon::
 ; writes a blank tile to all possible menu cursor positions on the party menu
 ErasePartyMenuCursors::
 	hlcoord 0, 1
-	ld bc, 2 * 20 ; menu cursor positions are 2 rows apart
+	ld bc, 2 * SCREEN_WIDTH ; menu cursor positions are 2 rows apart
 	ld a, 6 ; 6 menu cursor positions
 .loop
 	ld [hl], " "
@@ -296,7 +296,7 @@ ErasePartyMenuCursors::
 	ret
 
 ItemMenuLoop:
-	call LoadScreenTilesFromBuffer2DisableBGTransfer ; restore saved screen
+	call LoadScreenTilesFromBuffer2DisableBGTransfer
 	call RunDefaultPaletteCommand
 
 StartMenu_Item::
@@ -323,7 +323,7 @@ StartMenu_Item::
 	ld [wBagSavedMenuItem], a
 	jr nc, .choseItem
 .exitMenu
-	call LoadScreenTilesFromBuffer2 ; restore saved screen
+	call LoadScreenTilesFromBuffer2
 	call LoadTextBoxTilePatterns
 	call UpdateSprites
 	jp RedisplayStartMenu
@@ -363,7 +363,7 @@ StartMenu_Item::
 	bit B_PAD_B, a
 	jr z, .useOrTossItem
 	jp ItemMenuLoop
-.useOrTossItem ; if the player made the choice to use or toss the item
+.useOrTossItem
 	ld a, [wCurItem]
 	ld [wNamedObjectIndex], a
 	call GetItemName
@@ -459,14 +459,14 @@ StartMenu_TrainerInfo::
 	xor a
 	ldh [hTileAnimations], a
 	call DrawTrainerInfo
-	predef DrawBadges ; draw badges
+	predef DrawBadges
 	ld b, SET_PAL_TRAINER_CARD
 	call RunPaletteCommand
 	call GBPalNormal
-	call WaitForTextScrollButtonPress ; wait for button press
+	call WaitForTextScrollButtonPress
 	call GBPalWhiteOut
 	call LoadFontTilePatterns
-	call LoadScreenTilesFromBuffer2 ; restore saved screen
+	call LoadScreenTilesFromBuffer2
 	call RunDefaultPaletteCommand
 	call ReloadMapData
 	call LoadGBPal
@@ -489,7 +489,7 @@ DrawTrainerInfo:
 	ld de, vChars2 tile $00
 	ld bc, $1c tiles
 	call CopyData
-	ld hl, TrainerInfoTextBoxTileGraphics ; trainer info text box tile patterns
+	ld hl, TrainerInfoTextBoxTileGraphics
 	ld de, vChars2 tile $77
 	ld bc, 8 tiles
 	push bc
@@ -499,10 +499,10 @@ DrawTrainerInfo:
 	ld bc, $17 tiles
 	call TrainerInfo_FarCopyData
 	pop bc
-	ld hl, BadgeNumbersTileGraphics  ; badge number tile patterns
+	ld hl, BadgeNumbersTileGraphics
 	ld de, vChars1 tile $58
 	call TrainerInfo_FarCopyData
-	ld hl, GymLeaderFaceAndBadgeTileGraphics  ; gym leader face and badge tile patterns
+	ld hl, GymLeaderFaceAndBadgeTileGraphics
 	ld de, vChars2 tile $20
 	ld bc, 8 * 8 tiles
 	ld a, BANK(GymLeaderFaceAndBadgeTileGraphics)
@@ -555,12 +555,12 @@ DrawTrainerInfo:
 	ld c, 3 | LEADING_ZEROES | LEFT_ALIGN | MONEY_SIGN
 	call PrintBCDNumber
 	hlcoord 9, 6
-	ld de, wPlayTimeHours ; hours
+	ld de, wPlayTimeHours
 	lb bc, LEFT_ALIGN | 1, 3
 	call PrintNumber
 	ld [hl], $d6 ; colon tile ID
 	inc hl
-	ld de, wPlayTimeMinutes ; minutes
+	ld de, wPlayTimeMinutes
 	lb bc, LEADING_ZEROES | 1, 2
 	jp PrintNumber
 
@@ -642,8 +642,8 @@ StartMenu_SaveReset::
 	ld a, [wStatusFlags4]
 	bit BIT_LINK_CONNECTED, a
 	jp nz, Init
-	predef SaveSAV ; save the game
-	call LoadScreenTilesFromBuffer2 ; restore saved screen
+	predef SaveMenu
+	call LoadScreenTilesFromBuffer2
 	jp HoldTextDisplayOpen
 
 StartMenu_Option::
@@ -652,7 +652,7 @@ StartMenu_Option::
 	call ClearScreen
 	call UpdateSprites
 	callfar DisplayOptionMenu
-	call LoadScreenTilesFromBuffer2 ; restore saved screen
+	call LoadScreenTilesFromBuffer2
 	call LoadTextBoxTilePatterns
 	call UpdateSprites
 	jp RedisplayStartMenu
diff --git a/engine/movie/hall_of_fame.asm b/engine/movie/hall_of_fame.asm
index 236cf516..7653b4bc 100644
--- a/engine/movie/hall_of_fame.asm
+++ b/engine/movie/hall_of_fame.asm
@@ -7,7 +7,7 @@ AnimateHallOfFame:
 	call LoadTextBoxTilePatterns
 	call DisableLCD
 	ld hl, vBGMap0
-	ld bc, $800
+	ld bc, 2 * TILEMAP_AREA
 	ld a, " "
 	call FillMemory
 	call EnableLCD
diff --git a/engine/movie/oak_speech/clear_save.asm b/engine/movie/oak_speech/clear_save.asm
index d5c04e6e..f4a278b3 100644
--- a/engine/movie/oak_speech/clear_save.asm
+++ b/engine/movie/oak_speech/clear_save.asm
@@ -15,7 +15,7 @@ DoClearSaveDialogue:
 	ld a, [wCurrentMenuItem]
 	and a
 	jp z, Init
-	farcall ClearSAV
+	farcall ClearAllSRAMBanks
 	jp Init
 
 ClearSaveDataText:
diff --git a/engine/movie/title.asm b/engine/movie/title.asm
index 83fb32e8..bcd01f33 100644
--- a/engine/movie/title.asm
+++ b/engine/movie/title.asm
@@ -356,7 +356,7 @@ DrawPlayerCharacter:
 
 ClearBothBGMaps:
 	ld hl, vBGMap0
-	ld bc, $400 * 2
+	ld bc, 2 * TILEMAP_AREA
 	ld a, " "
 	jp FillMemory
 
diff --git a/engine/movie/trade.asm b/engine/movie/trade.asm
index 4d7bd54a..4cb9d394 100644
--- a/engine/movie/trade.asm
+++ b/engine/movie/trade.asm
@@ -167,7 +167,7 @@ LoadTradingGFXAndMonNames:
 	ld a, BANK(TradingAnimationGraphics2)
 	call FarCopyData2
 	ld hl, vBGMap0
-	ld bc, $800
+	ld bc, 2 * TILEMAP_AREA
 	ld a, " "
 	call FillMemory
 	call ClearSprites
@@ -223,7 +223,7 @@ Trade_Cleanup:
 	ret
 
 Trade_ShowPlayerMon:
-	ld a, %10101011
+	ld a, LCDC_ON | LCDC_WIN_9800 | LCDC_WIN_ON | LCDC_BLOCK21 | LCDC_BG_9C00 | LCDC_OBJ_8 | LCDC_OBJ_ON | LCDC_BG_ON
 	ldh [rLCDC], a
 	ld a, $50
 	ldh [hWY], a
@@ -279,7 +279,7 @@ Trade_DrawOpenEndOfLinkCable:
 	ld a, $a0
 	ldh [hSCX], a
 	call DelayFrame
-	ld a, %10001011
+	ld a, LCDC_ON | LCDC_WIN_9800 | LCDC_WIN_OFF | LCDC_BLOCK21 | LCDC_BG_9C00 | LCDC_OBJ_8 | LCDC_OBJ_ON | LCDC_BG_ON
 	ldh [rLCDC], a
 	hlcoord 6, 2
 	ld b, TILEMAP_LINK_CABLE
@@ -338,7 +338,7 @@ Trade_AnimateBallEnteringLinkCable:
 	ld a, $1
 	ldh [hAutoBGTransferEnabled], a
 	call ClearScreen
-	ld b, $98
+	ld b, HIGH(vBGMap0)
 	call CopyScreenTileBufferToVRAM
 	call Delay3
 	xor a
@@ -452,7 +452,7 @@ Trade_InitGameboyTransferGfx:
 	ldh [hAutoBGTransferEnabled], a
 	call Trade_LoadMonPartySpriteGfx
 	call DelayFrame
-	ld a, %10101011
+	ld a, LCDC_ON | LCDC_WIN_9800 | LCDC_WIN_ON | LCDC_BLOCK21 | LCDC_BG_9C00 | LCDC_OBJ_8 | LCDC_OBJ_ON | LCDC_BG_ON
 	ldh [rLCDC], a
 	xor a
 	ldh [hSCX], a
@@ -757,7 +757,7 @@ Trade_ShowClearedWindow:
 	ld a, $1
 	ldh [hAutoBGTransferEnabled], a
 	call ClearScreen
-	ld a, %11100011
+	ld a, LCDC_DEFAULT
 	ldh [rLCDC], a
 	ld a, $7
 	ldh [rWX], a
diff --git a/engine/overworld/missable_objects.asm b/engine/overworld/missable_objects.asm
index 8f88b138..1660a894 100644
--- a/engine/overworld/missable_objects.asm
+++ b/engine/overworld/missable_objects.asm
@@ -15,9 +15,6 @@ MarkTownVisitedAndLoadMissableObjects::
 	add hl, bc
 	ld a, [hli]                ; load missable objects pointer in hl
 	ld h, [hl]
-	; fall through
-
-LoadMissableObjects:
 	ld l, a
 	push hl
 	ld de, MissableObjects     ; calculate difference between out pointer and the base pointer
diff --git a/engine/pokemon/bills_pc.asm b/engine/pokemon/bills_pc.asm
index ea21e8e2..6d522377 100644
--- a/engine/pokemon/bills_pc.asm
+++ b/engine/pokemon/bills_pc.asm
@@ -151,7 +151,7 @@ BillsPCMenu:
 	ld c, 9
 	call TextBoxBorder
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	cp 9
 	jr c, .singleDigitBoxNum
 ; two digit box num
@@ -236,7 +236,7 @@ BillsPCDeposit:
 	call WaitForSoundToFinish
 	ld hl, wBoxNumString
 	ld a, [wCurrentBoxNum]
-	and $7f
+	and BOX_NUM_MASK
 	cp 9
 	jr c, .singleDigitBoxNum
 	sub 9
@@ -538,6 +538,7 @@ JustAMomentText::
 	text_far _JustAMomentText
 	text_end
 
+UnusedOpenBillsPC: ; unreferenced
 	ld a, [wSpritePlayerStateData1FacingDirection]
 	cp SPRITE_FACING_UP
 	ret nz
diff --git a/engine/pokemon/status_screen.asm b/engine/pokemon/status_screen.asm
index a68f9b38..344e7802 100644
--- a/engine/pokemon/status_screen.asm
+++ b/engine/pokemon/status_screen.asm
@@ -427,7 +427,7 @@ StatusScreen2:
 	ld a, $1
 	ldh [hAutoBGTransferEnabled], a
 	call Delay3
-	call WaitForTextScrollButtonPress ; wait for button
+	call WaitForTextScrollButtonPress
 	pop af
 	ldh [hTileAnimations], a
 	ld hl, wStatusFlags2
diff --git a/home/init.asm b/home/init.asm
index 67fa3ab1..2ed200b4 100644
--- a/home/init.asm
+++ b/home/init.asm
@@ -7,17 +7,6 @@ SoftReset::
 
 Init::
 ;  Program init.
-
-; * LCD enabled
-; * Window tile map at $9C00
-; * Window display enabled
-; * BG and window tile data at $8800
-; * BG tile map at $9800
-; * 8x8 OBJ size
-; * OBJ display enabled
-; * BG display enabled
-DEF LCDC_DEFAULT EQU LCDC_ON | LCDC_WIN_9C00 | LCDC_WIN_ON | LCDC_BLOCK21 | LCDC_BG_9800 | LCDC_OBJ_8 | LCDC_OBJ_ON | LCDC_BG_ON
-
 	di
 
 	xor a
@@ -100,7 +89,7 @@ DEF LCDC_DEFAULT EQU LCDC_ON | LCDC_WIN_9C00 | LCDC_WIN_ON | LCDC_BLOCK21 | LCDC
 	ld a, BANK(SFX_Shooting_Star)
 	ld [wAudioROMBank], a
 	ld [wAudioSavedROMBank], a
-	ld a, $9c
+	ld a, HIGH(vBGMap1)
 	ldh [hAutoBGTransferDest + 1], a
 	xor a
 	ldh [hAutoBGTransferDest], a
diff --git a/home/map_objects.asm b/home/map_objects.asm
index e0d9b6a5..44b012e6 100644
--- a/home/map_objects.asm
+++ b/home/map_objects.asm
@@ -30,27 +30,25 @@ TextScript_ItemStoragePC::
 	call SaveScreenTilesToBuffer2
 	ld b, BANK(PlayerPC)
 	ld hl, PlayerPC
-	jr bankswitchAndContinue
+	jr BankswitchAndContinue
 
 TextScript_BillsPC::
 	call SaveScreenTilesToBuffer2
 	ld b, BANK(BillsPC_)
 	ld hl, BillsPC_
-	jr bankswitchAndContinue
+	jr BankswitchAndContinue
 
 TextScript_GameCornerPrizeMenu::
-; XXX find a better name for this function
-; special_F7
 	ld b, BANK(CeladonPrizeMenu)
 	ld hl, CeladonPrizeMenu
-bankswitchAndContinue::
+BankswitchAndContinue::
 	call Bankswitch
 	jp HoldTextDisplayOpen        ; continue to main text-engine function
 
 TextScript_PokemonCenterPC::
 	ld b, BANK(ActivatePC)
 	ld hl, ActivatePC
-	jr bankswitchAndContinue
+	jr BankswitchAndContinue
 
 StartSimulatingJoypadStates::
 	xor a
diff --git a/home/overworld.asm b/home/overworld.asm
index 8c79d6e7..5af527c0 100644
--- a/home/overworld.asm
+++ b/home/overworld.asm
@@ -114,7 +114,7 @@ OverworldLoopLessDelay::
 	ld [wEnteringCableClub], a
 	jr z, .changeMap
 ; XXX can this code be reached?
-	predef LoadSAV
+	predef TryLoadSaveFile
 	ld a, [wCurMap]
 	ld [wDestinationMap], a
 	call PrepareForSpecialWarp
diff --git a/home/text_script.asm b/home/text_script.asm
index 35dd955b..389f2499 100644
--- a/home/text_script.asm
+++ b/home/text_script.asm
@@ -84,7 +84,7 @@ ENDM
 	dict  TX_SCRIPT_PRIZE_VENDOR,            TextScript_GameCornerPrizeMenu
 	dict2 TX_SCRIPT_CABLE_CLUB_RECEPTIONIST, callfar CableClubNPC
 
-	call PrintText_NoCreatingTextBox ; display the text
+	call PrintText_NoCreatingTextBox
 	ld a, [wDoNotWaitForButtonPressAfterDisplayingText]
 	and a
 	jr nz, HoldTextDisplayOpen
@@ -93,7 +93,7 @@ AfterDisplayingTextID::
 	ld a, [wEnteringCableClub]
 	and a
 	jr nz, HoldTextDisplayOpen
-	call WaitForTextScrollButtonPress ; wait for a button press after displaying all the text
+	call WaitForTextScrollButtonPress
 
 ; loop to hold the dialogue box open as long as the player keeps holding down the A button
 HoldTextDisplayOpen::
diff --git a/home/vcopy.asm b/home/vcopy.asm
index 92c78a88..e4ba2cdb 100644
--- a/home/vcopy.asm
+++ b/home/vcopy.asm
@@ -140,7 +140,7 @@ AutoBgMapTransfer::
 	ld h, a
 	ldh a, [hAutoBGTransferDest]
 	ld l, a
-	ld de, 12 * 32
+	ld de, 12 * TILEMAP_WIDTH
 	add hl, de
 	xor a ; TRANSFERTOP
 	jr .doTransfer
@@ -160,7 +160,7 @@ AutoBgMapTransfer::
 	ld h, a
 	ldh a, [hAutoBGTransferDest]
 	ld l, a
-	ld de, 6 * 32
+	ld de, 6 * TILEMAP_WIDTH
 	add hl, de
 	ld a, TRANSFERBOTTOM
 .doTransfer
diff --git a/scripts/HallOfFame.asm b/scripts/HallOfFame.asm
index eb26afaf..31d56022 100644
--- a/scripts/HallOfFame.asm
+++ b/scripts/HallOfFame.asm
@@ -47,7 +47,7 @@ HallOfFameResetEventsAndSaveScript:
 	ld [wHallOfFameCurScript], a
 	ld a, PALLET_TOWN
 	ld [wLastBlackoutMap], a
-	farcall SaveSAVtoSRAM
+	farcall SaveGameData
 	ld b, 5
 .delayLoop
 	ld c, 600 / 5
diff --git a/scripts/PokemonMansionB1F.asm b/scripts/PokemonMansionB1F.asm
index e31bbd3e..176c243a 100644
--- a/scripts/PokemonMansionB1F.asm
+++ b/scripts/PokemonMansionB1F.asm
@@ -16,30 +16,30 @@ MansionB1FCheckReplaceSwitchDoorBlocks:
 	CheckEvent EVENT_MANSION_SWITCH_ON
 	jr nz, .switchTurnedOn
 	ld a, $e
-	ld bc, $80d
+	lb bc, 8, 13
 	call Mansion2ReplaceBlock
 	ld a, $e
-	ld bc, $b06
+	lb bc, 11, 6
 	call Mansion2ReplaceBlock
 	ld a, $5f
-	ld bc, $304
+	lb bc, 3, 4
 	call Mansion2ReplaceBlock
 	ld a, $54
-	ld bc, $808
+	lb bc, 8, 8
 	call Mansion2ReplaceBlock
 	ret
 .switchTurnedOn
 	ld a, $2d
-	ld bc, $80d
+	lb bc, 8, 13
 	call Mansion2ReplaceBlock
 	ld a, $5f
-	ld bc, $b06
+	lb bc, 11, 6
 	call Mansion2ReplaceBlock
 	ld a, $e
-	ld bc, $304
+	lb bc, 3, 4
 	call Mansion2ReplaceBlock
 	ld a, $e
-	ld bc, $808
+	lb bc, 8, 8
 	call Mansion2ReplaceBlock
 	ret
 
diff --git a/scripts/SeafoamIslandsB4F.asm b/scripts/SeafoamIslandsB4F.asm
index 314a8d50..40ecee0a 100644
--- a/scripts/SeafoamIslandsB4F.asm
+++ b/scripts/SeafoamIslandsB4F.asm
@@ -37,7 +37,7 @@ SeafoamIslandsB4FDefaultScript:
 	ld a, [wCoordIndex]
 	cp $3
 	jr nc, .only1UpInputNeeded
-	ld a, NPC_MOVEMENT_UP
+	ld a, PAD_UP
 	ld [wSimulatedJoypadStatesEnd + 1], a
 	ld a, 2
 	jr .forcePlayerUpFromSurfExit
diff --git a/scripts/VermilionDock.asm b/scripts/VermilionDock.asm
index 608d2b7e..237b4175 100644
--- a/scripts/VermilionDock.asm
+++ b/scripts/VermilionDock.asm
@@ -50,7 +50,7 @@ VermilionDockSSAnneLeavesScript:
 	ld [wSpritePlayerStateData1ImageIndex], a
 	ld c, 120
 	call DelayFrames
-	ld b, $9c
+	ld b, HIGH(vBGMap1)
 	call CopyScreenTileBufferToVRAM
 	hlcoord 0, 10
 	ld bc, SCREEN_WIDTH * 6