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Note from Mateo: Okay, this was originally posted by RED and he sent it to me via Facebook, and told me I could repost it. So I figured I would post it here to help people out.
Tools that will be needed.
First open your rom in your hex editor..Find 2 blank areas of space, long run of zero will be good enough (As much as possible are both at the same bank)
Now in this TuT I will use the address 0xA0000 but you can use your own address
Now write this to the blank that you have found:
21 A0 C3 11 D9 CC 06 12 0E 14 7E E5 CB 3F 38 10 21 CF D0 86 6F FA D0 D0 CE 00 67 7E E6 0F 18 10 21 CF D0 86 6F FA D0 D0 CE 00 67 7E CB 37 E6 0F E1 12 CB BE 23 13 0D 20 D1 05 20 CC C9
21 20 CC 11 48 CC 7E E5 CB 3F 38 10 21 CF D0 86 6F FA D0 D0 CE 00 67 7E E6 0F 18 10 21 CF D0 86 6F FA D0 D0 CE 00 67 7E CB 37 E6 0F E1 12 CB BE 23 13 0D 20 D1 C9
Now we will now repoint the data...Just Go this following address and replace it by the bytes of the pointer you've found..
0xD5C = zz -bank
0xD5F = xx yy -2byte pointer
0xD68 = zz -bank
0xD6B = xx yy -2byte pointer
Now you can go into Melash's Tileset Editor and store pallet data in your new bank.
I am no longer active on this forum. I only pop in from time to time.
I can't comment it right now, but I felt that this was a little more comprehensible than the bytecodes. From what I can tell this is a copied version of the old routine at the start of bank 2, which maps palettes to tile ids. The palette maps are condensed to nybbles, with the least-significant nybble first.
So if your first 4 tiles had palettes [1 4 8 6] in that order, the first 2 bytes of your palette map would look like [41 68].
At a glance, $c3a0 is the tilemap and $ccd9 is the attribute map. For our purposes we're just taking the nybble we got earlier and putting each one in its own byte so it maps to a specific tile. The screen is 20x18 tiles ($14 x $12).
RO28:4000 21 A0 C3 ld hl,C3A0 RO28:4003 11 D9 CC ld de,CCD9 RO28:4006 06 12 ld b,12 RO28:4008 0E 14 ld c,14 RO28:400A 7E ld a,(hl) RO28:400B E5 push hl RO28:400C CB 3F srl a RO28:400E 38 10 jr c,4020 RO28:4010 21 CF D0 ld hl,D0CF RO28:4013 86 add (hl) RO28:4014 6F ld l,a RO28:4015 FA D0 D0 ld a,(D0D0) RO28:4018 CE 00 adc a,00 RO28:401A 67 ld h,a RO28:401B 7E ld a,(hl) RO28:401C E6 0F and a,0F RO28:401E 18 10 jr 4030 RO28:4020 21 CF D0 ld hl,D0CF RO28:4023 86 add (hl) RO28:4024 6F ld l,a RO28:4025 FA D0 D0 ld a,(D0D0) RO28:4028 CE 00 adc a,00 RO28:402A 67 ld h,a RO28:402B 7E ld a,(hl) RO28:402C CB 37 swap a RO28:402E E6 0F and a,0F RO28:4030 E1 pop hl RO28:4031 12 ld (de),a RO28:4032 CB BE res 7,(hl) RO28:4034 23 inc hl RO28:4035 13 inc de RO28:4036 0D dec c RO28:4037 20 D1 jr nz,400A RO28:4039 05 dec b RO28:403A 20 CC jr nz,4008 RO28:403C C9 ret
Similarly, $cc20 is the bg map, and $cc48 is the bg map palettes. It works the same way, except the bg map is 32x32.
RO28:403D 21 20 CC ld hl,CC20 RO28:4040 11 48 CC ld de,CC48 RO28:4043 7E ld a,(hl) RO28:4044 E5 push hl RO28:4045 CB 3F srl a RO28:4047 38 10 jr c,4059 RO28:4049 21 CF D0 ld hl,D0CF RO28:404C 86 add (hl) RO28:404D 6F ld l,a RO28:404E FA D0 D0 ld a,(D0D0) RO28:4051 CE 00 adc a,00 RO28:4053 67 ld h,a RO28:4054 7E ld a,(hl) RO28:4055 E6 0F and a,0F RO28:4057 18 10 jr 4069 RO28:4059 21 CF D0 ld hl,D0CF RO28:405C 86 add (hl) RO28:405D 6F ld l,a RO28:405E FA D0 D0 ld a,(D0D0) RO28:4061 CE 00 adc a,00 RO28:4063 67 ld h,a RO28:4064 7E ld a,(hl) RO28:4065 CB 37 swap a RO28:4067 E6 0F and a,0F RO28:4069 E1 pop hl RO28:406A 12 ld (de),a RO28:406B CB BE res 7,(hl) RO28:406D 23 inc hl RO28:406E 13 inc de RO28:406F 0D dec c RO28:4070 20 D1 jr nz,4043 RO28:4072 C9 ret
Last edited by comet (2013-03-08 08:02:38)