Skeetendo

0xFf2- upper side
0x1009-right side
0x1002- left side
0x1013-downleft
0x1016- down part
0x101b-downright

Okay, I understand how I would replace change the tile that the script points to now, but now I need to find the location of the script that loads the borders into VRAM in the first place.  I want the borders placement in VRAM to start where the leftover ぇ is right now, at tile 77 instead of at tile 79, that way the game can still have multiple borders available for the player to choose.  I also know that I would have to repoint the location of the borders, but that's simple enough to do later on.

Last edited by Munchulax (2013-06-02 01:06:07)

Don't I only have to repoint the routine that loads the tiles into VRAM and the borders themselves?  Unless I'm missing something here.

So this is what I have right now:

(The borders are placeholders)

Back in September last year I asked a question about changing 1bpp borders to 2bpp borders.  Sawakita replied with a disassembly of the border code in Gold:

The beginning of the code he posted started at 3E:4040 in Gold.  I have found the equivalent code in Crystal at 3E:74CC:

ld a,(CFCE)    ; get current border type from CFCE in RAM (0-7)
and a,07        ; probably makes sure that A be less than 8 
ld bc,0030        ; each 1bpp tile is 0x08 bytes large -> 0x30 = (0x8 * 6) bytes
ld hl,4800        ; pointer to first border graphics (they're consecutives)
call 30FE        ; calculate correct pointer (HL + (BC * A))
ld d,h            ; put graphics pointer
ld e,l                ; into de
ld hl,9790        ; (¹) VRAM destination
ld bc,3E06        ; (²) put bank in B and number of tiles in C
call 0DDC         ; (³) load 1bpp graphics (on-the-fly conversion to 2bpp) into VRAM
ld hl,97F0         ; same as (¹)
ld de,5204        ; 1bpp graphics source
ld bc,3E01     ; same as (²)
call 0DDC         ; same as (³)
ret

Looking at the code, I think I know what I need to modify in order to load parts of borders into certain addresses in VRAM, but I'm not sure if the actual code for the borders starts here or not because I can't find a pointer in the same ROM bank (3E) that points to FB4CC.  Could someone point me in the right direction so that I can repoint the routine so I can modify the routine that loads the tiles into VRAM?

Now that I have time to work on this again:

I felt like that would be the easy way to do it (even though players of the hack and the game itself don't care and it doesn't make a difference), so I changed some of the code that loads the borders from ROM into VRAM, and now the tile arrangement looks like this (borders are placeholders):

Overworld:    In Battle:

Borders load correctly and correctly change as well.  The only problem I have now is that I can't figure out where the code that tells the game where to place Battle HUD tiles onscreen is in the ROM.  Therefore, because the code is currently unmodified the Battle HUD looks like this because:
was shifted left from 0:9710 to 0:9700
was shifted left from 0:9740 to 0:9710
was shifted left from 0:9740 - 0:9770 to 0:9720 - 0:9750

Could someone point me in the right direction with this problem so I can fix the Battle HUD?