itch.io

diff --git a/celeste.s b/celeste.s
index 79b3778..259ee3b 100644
--- a/celeste.s
+++ b/celeste.s
@@ -217,7 +217,10 @@ oamtrashheap:
        ds 256
 
 SECTION "Reserve",ROM0[$0]
-       ds 256
+
+SECTION "Vblank", ROM0[$40]
+Vblank:
+       reti
 
 SECTION "Header", ROM0[$100]
        nop
@@ -242,7 +245,7 @@ ENDM
 ;
 ; TODO
 
-SECTION "Code", ROM0
+SECTION "Code", ROM0[$150]
 entry:
        ld a, 0
        ld [rNR52], a
@@ -335,6 +338,10 @@ copyspritedma:
        ld [rBGP], a
        ld [rOBP0], a
 
+       ld a, IEF_VBLANK
+       ldh [rIE], a
+       ei
+
        ld a, 2
        call playsong
 titleloop:
@@ -402,7 +409,7 @@ flashskip:
        call gensprites
        call adjustsprites
        call updatetitleparticles
-       call shakescroll
+       call titlescroll
        call musstep
        call musseq
        jp titleloop
@@ -820,13 +827,8 @@ assertfailed:
        jr assertfailed
 
 wblank:
-       ld a, [rLY]
-       cp 144
-       jr z, wblank
-wblank2:
-       ld a, [rLY]
-       cp 144
-       jr nz, wblank2
+       halt
+       nop
        ret
 
 wblo:
@@ -982,6 +984,13 @@ noshake:
 yesshake:
        ret
 
+titlescroll:
+       ld a, -12
+       ld [rSCX], a
+       ld a, -8
+       ld [rSCY], a
+       ret
+
 inittitleparticles:
        ld hl, titleparticles
        ld b, 12
@@ -3392,7 +3401,7 @@ loadborder:
        ld hl, $9800
        ld de, $0400
 loadborderloop:
-       ld a, $28
+       ld a, $00
        ld [hli], a
        dec de
        ld a, d

I modified part of the code, mainly changing the border to black—similar to the effect of a GBA port—and to make it easier to center the image on the title screen. I also enabled interrupts to reduce CPU usage, which helps save some battery life when running on actual hardware.