HUD and Inventory

Puzzledude wrote:
1.) Spining hearts in the HUD (when gaining health) (found by PuzzleDude)

address (no header) 6F152
address (with heder) 6F352

value of the byte is 68 (hearts spin on the right = Alttp position)
value of the byte is 06 (hearts spin on the left = parallel worlds position)

--------------------------------------------------------------------------------------

5.) Old HUD and MENU location (found by PuzzleDude)

bytes from 6DDA0 to 6FFC0 (no header), (on original rom):
Location of the hud and menu as it is presented in A link to the past.

bytes from 6DFA0 to 701C0 (with header), (on original rom):
Location of the hud and menu as it is presented in A link to the past.


You must search for the values as they are in Alttp to match it with the hack,
might not be on the exact same place but close to it.

--------------------------------------------------------------------------------------

8.) New HUD (Parallel Worlds HUD) but OLD menu (Alttp menu) = best combination (found by PuzzleDude)

A) spining hearts in the HUD (all is for NO header)
address 6F152, value must be 06 (spining on the left = parallel worlds)
, old value is 68 (spining on the right = Alttp)


B) new HUD position, from 6FB75 to 6FFC0 (no header)

For the header addresses simply go 32 lines Down from the current address!

* after hex editing = graphics must be changed!, so that the new magic bar is horizontal!

--------------------------------------------------------------------------------------

9.) Old Menu position (found by PuzzleDude)
from 6DDA0 to 6FB74 (no header + graphics must be compatible)


globaly (no header)
-MENU = from 6DDA0 to 6FB74

-HUD = from 6FB75 to 6FFC0

-MENU + HUD = from 6DDA0 to 6FFC0


If you want to insert the New hud or menu, go to acmlm board2, uploader, hack ips patches,
and find Gates of Darkness by SePH. It has new menu and hud (like in parallel worlds),
on these locations, compatible with the original rom + you have access to the data.
But graphics must be changed to new menu and hud graphics.

The new menu (parallel worlds) has one problem = one space is empty

Spane wrote:Who has done the hud and menu in parallel worlds?

Puzzledude wrote:While this is all true, you can not achieve Spane's menu with just hex.

You need to use asm to achiever this, but there are not many asm Z3 people out there.

Spane wrote:Who has done the hud and menu in parallel worlds?

Puzzledude wrote:I'm also wondering how to move the element elsewhere in the menu. for when you change the gfx and the colour, the spot is still hardcoded to this item. For instance the first item is always a Bow. How to change this, so that boomerang is first and bow second (not just gfx but in the actual game).

Euclid and NEONswift wrote:
Zelda 3 HUD Assembly
TILE FORMAT - HVPP PBBB

first you need to learn tile layout or the data for each tile
each tile is 2 bytes - 16 bits
Their layout: HVpp pbbb tttt tttt
16 bits there starting from the right

t is the tile number
basically, if you say open up the lttp gfx file in yychr you may have noticed when you mouse over the gfx tiles, it'll say "bank $xx" somewhere
the xx basically refers to this
the gfx is already loaded to the PPU already all you got is this value to point it
and also the 3 b bits to determine which block of gfx to use out of about 7 of them
p is the palette, one out of 7 already defined palettes
H and V are horizontal and vertical mirroring of the gfx tile

------------------------------

YY-CHR AND THE TILESET BLOCKS

first boot up yy-chr, load lttp gfx, switch it to 2gb and find those menu items, load a palette file if you want
ok lets take... something which is shown on the hud
top left you should see bug catching net
ok lets see... the numbers are good
they're 90 to 99
boot up lttp according to MoN's doc you should find out that 7EC700 or so
anyway the data which is written straight to the PPU is at about 7EC700
so in your zsnes cheat (or snes9x cheat)
in your cheat box type in say 7EC70090 and see the change on your screen
if you want say the first tile of the bug catching net word you would write 00
that's the low 8 bytes - the its on that format thing

you may notice the 0 has a different palette than your other numbers so to change that we have to look in the high byte, 7EC701with no mirroring
so say we want palette 0 just write 00 to 7EC70100
the palette is black, try something else say palette 5 what would you write in there
well ok Hip pbbb 5 is 101

0010 1000 = 0x28
so type in 7EC70128

lets try mirroring 0 is probably not the best letter to mirror
say... 7 would be good so go change it to a 7
7EC70097
then now flipping the first 2 bits on in the second byte
7EC701E0
notice the change in the 7

all the game does is pick out stuff from there and draw it onto the screen
that's one tile you're modifying, imagine the whole screen is made of these tiles
so in the actual rom its all stored in $6FE77 - $6FFC0
changing that is ok when you want it to always appear

for stuff which changes, you need code

------------------------------

HUD DISPLAY AND DISTANCE

first you need to know the 7EC700 ram area only goes up to a specific spot

C:\Documents and Settings\User\Desktop\loz1.png from Euclid

should go up to only 164 8x8 blocks right
I just made it so it goes from 7EC500 all the way to like 7ECC00 or so

wouldn't that clash with existing ram data?
I didn't know what the existing ram data is used but I did it anyway and it seemed to worked fine at first
my first problem was the monologue box, when it pops up on the bottom it flashes like crazy
because it's writing both my rupee count and the box on the same HUD
that sucked, I managed to like make sure my rupee counter doesn't get updated when the box is up
apparently that area of the ram is used for scrolling the secret wall
creates a rather nasty effect, but it works fine afterwards
and so far, apart from these 2 bugs, I see no problems with it.
in the end if you want to expand it I can tell you how to fix the monologue problem

------------------------------

RUPEE DISPLAY

Anyway let me start doing some quick explanation on the hud code
first do a trace of the lttp rom anywhere
just get into the rom, have link staying somewhere, trace, run for a while, stop trace
ok say I want to find out where the money gets drawn
go search for some LDA on 7EF362

$0D/FC4C 8F C6 C7 7E STA $7EC7C6[$7E:C7C6] A:3C5E X:0080 Y:0012 P:envmxdizc
$0D/FC50 BD F5 FD LDA $FDF5,x[$0D:FE75] A:3C5E X:0080 Y:0012 P:envmxdizc
$0D/FC53 8F 06 C8 7E STA $7EC806[$7E:C806] A:3C5E X:0080 Y:0012 P:envmxdizc
$0D/FC57 AF 62 F3 7E LDA $7EF362[$7E:F362] A:3C5E X:0080 Y:0012 P:envmxdizc
$0D/FC5B 20 F7 F0 JSR $F0F7 [$0D:F0F7] A:03E7 X:0080 Y:0012 P:envmxdizc

yep that looks right now you're in the middle of the code
ok let me explain the JSR $F0F7
it's a routine which takes a hex number (the number of rupees in this case) and writes the tile number which is needed to draw that number in some memory
basically a hex -> decimal converter
so scroll down a bit
upon return from that routine
you'll see a LDA $03 AND #$00FF ORA #$2400
then a STA $7EC750 then the same thing repeats for $04 and $05

$03 in this case has the 100th digit
$04 has the 10th digit
$05 has the last digit

they just write it to $7EC750/52/54 which is the 3 tiles for the money
they ORA #$24 is to make it use palette 6
so basically that's that
if you EA those code there, the money won't appear

------------------------------

ARROWS AND BOMBS DISPLAY

you may notice the stuff afterwards
LDA $7EF343 that address ring any bells?
that's the bomb counter
after that you will see the same routine JSR $F0F7 the hex -> decimal routine gets called again
and numbers are written into 7EC758 7EC75A
then it loads 7EF377, the same thing happens
7EF377 is the arrow counter

-----------------------------

DUNGEON FLOOR DISPLAY

scroll down a bit more
$7EF36F
Keys: $36F. Number of Keys you have in a dungeon. You can earn keys on the Overworld but they don't do anything. If you're in a non-keyed dungeon it will generally read FF.

scroll down a bit more, you've got RTS and some more code afterwards

$0A/FD92 A9 7F 00 LDA #$007F A:0000 X:00FF Y:00FE P:envmxdiZC
$0A/FD95 8F F2 C7 7E STA $7EC7F2[$7E:C7F2] A:007F X:00FF Y:00FE P:envmxdizC
$0A/FD99 8F 32 C8 7E STA $7EC832[$7E:C832] A:007F X:00FF Y:00FE P:envmxdizC
$0A/FD9D 8F F4 C7 7E STA $7EC7F4[$7E:C7F4] A:007F X:00FF Y:00FE P:envmxdizC
$0A/FDA1 8F 34 C8 7E STA $7EC834[$7E:C834] A:007F X:00FF Y:00FE P:envmxdizC

notice that bunch of STAs which are related to that $7ECxxx area?
well if you did the trace in the Overworld that wouldn't show up
because that's to clear the area which it writes "1F" etc

anyway scrolling down ends the code

---------------------------

MAGIC BAR DISPLAY

scroll up this time
from the rupees
you may notice 4 STAs
746 786 7C6 806
btw each row in the screen is 0x40 bytes long
that's actually one vertical row of tiles it's writing to
should be able to guess it is the magic bar
it uses a somewhat complicated method, I rewrote it because I have a more convenient method
and mine is horizontal

you see writes to 7EC704 06 08
then a bit above that you see a $7EF37B
if you look in MoN's doc
37B is the half magic trigger
that's basically drawing that

---------------------------

HEARTS AND ITEM DISPLAY

up a bit more you'll see reads from 7EF36C/6D
not entirely sure what it is but my guess is the hearts
that's about it for the code
scroll up a bit more you won't see much writes into the 7ECxxx area
you might be thinking when does that item in the item box gets updated
it gets updated when you move the cursor in the subscreen.
that's it for the code which runs every frame to keep the screen looking right
for other stuff which doesn't change it just gets loaded once from that 6FBxx area at the start of the game

the code is shorter than you'd think
the subscreen one is way longer though if you want to learn that one day.

-----------------------

FUTURE AREA HUD DISPLAY

basically if you want to put code to make say text appear in a place, just make sure it goes around the same place where all these updating code is
for a start I would try like writing the area name in say top left corner
because you can always change the place it writes to later

if you have trouble writing the ASM code, try thinking how you would do something like it in another programming language
then slowly convert it to ASM

with the block set to 0 you get that page of gfx in yychr
the letters are in block 1
and if you scroll down in yychr until you see the font
line up the top left with that MAP gfx
that's where block 1 starts
so A is block 1 0x50