Minor cleanup (remove unused HRAM, predef folder) before continuing.

engine/gfx/color.asm

@@ -1,5 +1,5 @@
 PALPACKET_LENGTH EQU $10
-INCLUDE "predef/sgb.asm"
+INCLUDE "engine/gfx/sgb_layouts.asm"
 
 SHINY_ATK_BIT EQU 5
 SHINY_DEF_VAL EQU 10
@@ -378,7 +378,7 @@ LoadMailPalettes:
 .MailPals:
 INCLUDE "gfx/mail/mail.pal"
 
-INCLUDE "predef/cgb.asm"
+INCLUDE "engine/gfx/cgb_layouts.asm"
 
 Function9a94: ; 9a94 (2:5a94)
 	ld hl, Palettes_9aaa

engine/menus/intro_menu.asm

@@ -277,13 +277,13 @@ Function5c41: ; 5c41 (1:5c41)
 	call ByteFill
 
 	ldh a, [rLY]
-	ldh [hSecondsBackup], a
+	ldh [hUnusedBackup], a
 	call DelayFrame
 	ldh a, [hRandomSub]
 	ld [wPlayerID], a
 
 	ldh a, [rLY]
-	ldh [hSecondsBackup], a
+	ldh [hUnusedBackup], a
 	call DelayFrame
 	ldh a, [hRandomAdd]
 	ld [wPlayerID + 1], a

engine/overworld/init_map.asm

@@ -60,10 +60,10 @@ Function656b: ; 656b (1:656b)
 	ld a, $1
 	ldh [hOAMUpdate], a
 	ld a, $3
-	ldh [hVBlankCounter + 1], a
+	ldh [hFF9E], a
 .asm_65bc
 	call DelayFrame
-	ldh a, [hVBlankCounter + 1]
+	ldh a, [hFF9E]
 	and a
 	jr nz, .asm_65bc
 	pop af

home/vblank.asm

@@ -136,7 +136,7 @@ VBlank0::
 	rst Bankswitch
 
 	ldh a, [hSeconds]
-	ldh [hSecondsBackup], a
+	ldh [hUnusedBackup], a
 
 	ret
 
@@ -387,7 +387,7 @@ VBlank3::
 
 	xor a
 	ldh [rIF], a
-	; enable ints 
+	; enable ints
 	ld a, %11111
 	ldh [rIE], a
 	ret

home/video.asm

@@ -399,7 +399,7 @@ AnimateTileset::
 
 Function1642::
 	nop
-	ldh a, [hVBlankCounter + 1]
+	ldh a, [hFF9E]
 	and a
 	ret z
 
@@ -409,7 +409,7 @@ Function1642::
 	jr z, .two
 
 	ld a, 2
-	ldh [hVBlankCounter + 1], a
+	ldh [hFF9E], a
 	ld hl, hBGMapAddress
 	ld a, [hli]
 	ld h, [hl]
@@ -437,7 +437,7 @@ endr
 	ld de, $320
 
 .go
-	ldh [hVBlankCounter + 1], a
+	ldh [hFF9E], a
 	ld hl, hBGMapAddress
 	ld a, [hli]
 	ld h, [hl]

hram.asm

@@ -1,10 +1,8 @@
 SECTION "HRAM", HRAM
 
-hTransferVirtualOAM:: ds 12 ; ff80
+hTransferVirtualOAM:: ds 10 ; ff80
 
-hROMBankBackup:: db ; ff8c
-hBuffer:: db ; ff8d
-hSRAMBank:: db ; ff8e
+	ds 5
 
 hRTCDayHi::   db ; ff8f
 hRTCDayLo::   db ; ff90
@@ -23,13 +21,15 @@ hSeconds::  db ; ff9a
 	ds 1
 
 hVBlankCounter:: db ; ff9d
-	ds 1
+
+hFF9E:: db ; ff9e
 
 hROMBank::  db ; ff9f
-hVBlank ::  db ; ffa0
+hVBlank::   db ; ffa0
 hMapEntryMethod:: db ; ffa1
 hMenuReturn:: db ; ffa2
-	ds 1
+
+hFFA3:: db ; ffa3
 
 hJoypadReleased:: db ; ffa4
 hJoypadPressed::  db ; ffa5
@@ -110,7 +110,8 @@ hLCDCPointer::      db ; ffc8
 hLYOverrideStart::  db ; ffc9
 hLYOverrideEnd::    db ; ffca
 
-hMobileReceive::             db ; ffcb
+	ds 1
+
 hSerialReceivedNewData::     db ; ffcc
 hSerialConnectionStatus::    db ; ffcd
 hSerialIgnoringInitialData:: db ; ffce
@@ -144,7 +145,7 @@ hRandom::
 hRandomAdd:: db ; ffe3
 hRandomSub:: db ; ffe4
 
-hSecondsBackup:: db ; ffe5
+hUnusedBackup:: db ; ffe5
 
 hBattleTurn:: ; ffe6
 ; Which trainer's turn is it? 0: player, 1: opponent trainer
@@ -153,8 +154,3 @@ hBattleTurn:: ; ffe6
 hCGBPalUpdate:: db ; ffe7
 hCGB::          db ; ffe8
 hSGB::          db ; ffe9
-
-hDMATransfer:: db ; ffea
-hMobile:: db ; ffeb
-hSystemBooted:: db ; ffec
-hClockResetTrigger:: db ; ffed