Reorganize home header

home/clear_sprites.asm

@@ -0,0 +1,21 @@
+ClearSprites::
+	xor a
+	ld hl, wOAMBuffer
+	ld b, 40 * 4
+.loop
+	ld [hli], a
+	dec b
+	jr nz, .loop
+	ret
+
+HideSprites::
+	ld a, 160
+	ld hl, wOAMBuffer
+	ld de, 4
+	ld b, 40
+.loop
+	ld [hl], a
+	add hl, de
+	dec b
+	jr nz, .loop
+	ret

home/header.asm

@@ -0,0 +1,57 @@
+; rst vectors (unused)
+
+SECTION "rst0", ROM0[$0000]
+	rst $38
+
+SECTION "rst8", ROM0[$0008]
+	rst $38
+
+SECTION "rst10", ROM0[$0010]
+	rst $38
+
+SECTION "rst18", ROM0[$0018]
+	rst $38
+
+SECTION "rst20", ROM0[$0020]
+	rst $38
+
+SECTION "rst28", ROM0[$0028]
+	rst $38
+
+SECTION "rst30", ROM0[$0030]
+	rst $38
+
+SECTION "rst38", ROM0[$0038]
+	rst $38
+
+
+; Game Boy hardware interrupts
+
+SECTION "vblank", ROM0[$0040]
+	jp VBlank
+
+SECTION "lcd", ROM0[$0048]
+	rst $38
+
+SECTION "timer", ROM0[$0050]
+	jp Timer
+
+SECTION "serial", ROM0[$0058]
+	jp Serial
+
+SECTION "joypad", ROM0[$0060]
+	reti
+
+
+SECTION "Header", ROM0[$0100]
+
+Start::
+; Nintendo requires all Game Boy ROMs to begin with a nop ($00) and a jp ($C3)
+; to the starting address.
+	nop
+	jp _Start
+
+; The Game Boy cartridge header data is patched over by rgbfix.
+; This makes sure it doesn't get used for anything else.
+
+	ds $0150 - @, $00

home/lcd.asm

@@ -0,0 +1,25 @@
+DisableLCD::
+	xor a
+	ld [rIF], a
+	ld a, [rIE]
+	ld b, a
+	res 0, a
+	ld [rIE], a
+
+.wait
+	ld a, [rLY]
+	cp LY_VBLANK
+	jr nz, .wait
+
+	ld a, [rLCDC]
+	and $ff ^ rLCDC_ENABLE_MASK
+	ld [rLCDC], a
+	ld a, b
+	ld [rIE], a
+	ret
+
+EnableLCD::
+	ld a, [rLCDC]
+	set rLCDC_ENABLE, a
+	ld [rLCDC], a
+	ret

home/start.asm

@@ -0,0 +1,10 @@
+_Start::
+	cp GBC
+	jr z, .gbc
+	xor a
+	jr .ok
+.gbc
+	ld a, 0
+.ok
+	ld [wGBC], a
+	jp Init