From d1d68d94bc0f2b93554528284d2b17ec1989a3fe Mon Sep 17 00:00:00 2001
From: nn <53490794+nn357@users.noreply.github.com>
Date: Sun, 25 Oct 2026 06:18:24 +0900
Subject: [PATCH] Initial

hud_expansion_opaque already fixed the DMA transfer size but didn't remove the BG2 backup/restore routine (which is only there because of the vanilla transfer size being too large)

Interestingly the hudfix copies 112 tiles over ($0E00) vs what should be correct vanilla 128 tiles ($1000), with a note in the .asm saying to not get bottom row of screen.

I assume this was / is for some graphical corruption? I tried it with both and couldn't see any differences but left the vanilla_hudfix patch to the DMA transfer size in place and just removed the unnecessary backup/restore of the bg2 tiles on pause/unpause.
---
 patches/ips/vanilla_bugfixes.ips | Bin 281 -> 297 bytes
 patches/rom_map/Bank 82.txt      |   1 +
 patches/rom_map/RAM.txt          |   1 +
 patches/src/vanilla_bugfixes.asm |  23 +++++++++++++++++++++--
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/patches/ips/vanilla_bugfixes.ips b/patches/ips/vanilla_bugfixes.ips
index 97aad0bd32951e7e900f91dd3e7bf6f2ea064c3e..7787949c8b3ce5f63030e5a63967c612f751c170 100644
GIT binary patch
delta 30
icmbQqw310Qz%j(xgOQhmfw_V46{B!DnBK@L!UzCvA_o)z

delta 14
VcmZ3<G?R%nz%j(xW22}DBLE&G1D5~*

diff --git a/patches/rom_map/Bank 82.txt b/patches/rom_map/Bank 82.txt
index 5ca9c5edb..7a6e78e64 100644
--- a/patches/rom_map/Bank 82.txt	
+++ b/patches/rom_map/Bank 82.txt	
@@ -1,5 +1,6 @@
 [unused vanilla code]
 8B18 - 8B1F: [free] [unused vanilla code] - 8 bytes
+8D51 - 8DBC: [free] [vanilla bg2 code, patched out in vanilla_bugfixes] - 108 bytes
 A3D9 - A424: [free] [unused vanilla code] - 76 bytes
 B5E8 - B62A: [free] [unused vanilla code] - 67 bytes
 B650 - B671: [free] [unused vanilla code] - 34 bytes
diff --git a/patches/rom_map/RAM.txt b/patches/rom_map/RAM.txt
index 6a1ad7731..434235e4f 100644
--- a/patches/rom_map/RAM.txt
+++ b/patches/rom_map/RAM.txt
@@ -36,6 +36,7 @@ $7ED823: randomizer-specific event flags:
   $0010: metal pirates room door unlocked
 $7ED825: pause menu room name enabled (map_area.asm)
 $7ed86c: bomb_torizo.asm
+$7EDF5C-$7EEF5B: [FREE] (vanilla_bugfixes removes the BG2 backup that used this block of ram.)
 $7EF4A0-$7EF4AF: temp storage for special tile (reserve_hud.asm)
 $7EF4B0-$7EF4E0: backup of DMA registers in decompression.asm
 $7EF4E0-$7EF4E4: pending MSU/SPC playback state (msu1.asm)
diff --git a/patches/src/vanilla_bugfixes.asm b/patches/src/vanilla_bugfixes.asm
index 4c99ef01c..ec86d16e4 100644
--- a/patches/src/vanilla_bugfixes.asm
+++ b/patches/src/vanilla_bugfixes.asm
@@ -225,7 +225,7 @@ org $84B7EF ; PLM $B8AC (speed booster escape) LDA $09A4  [$7E:09A4]
 ; this is due to a missing conditional branch instruction in the vanilla code.
 ; updated for split_speed compatibility, now fits in vanilla location with external table.
 ;
-; -nn357
+; nn_357
 
 org $82ac00
 	.loop
@@ -248,4 +248,23 @@ bootstable:
   dw $0100, $0200, $2000, $0040, $0080
 bootscat:
   dw $0003, $0103, $0203, $0203, $0303
-assert pc() <= !bank_82_free_space_end
\ No newline at end of file
+assert pc() <= !bank_82_free_space_end
+
+; Pause menu tiles routine DMA transfer size bug fix.
+; Vanilla code transfers too many bytes, destroying the BG2 tilemap.
+; Correcting the DMA transfer size means the backup/restore BG2 pause hook isn't needed.
+; Which also frees up the 4k block of ram used for the backup / restore.
+; nn_357
+
+;org $828ed2 ; Correct DMA transfer size $1000, [hud_expansion_opaque already fixes this, included for reference].
+;  db $10
+
+org $828d08 ; Back up BG2 tilemap for pause menu
+  bra +
+  nop
++
+
+org $829377 ; Restore BG2 tilemap from pause menu
+  bra +
+  nop
++
\ No newline at end of file