From b996ed922052a06e47d844e914652d3469ef6bc7 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Sat, 19 Jan 2019 23:37:44 +0200
Subject: [PATCH] =?UTF-8?q?Writing=20to=20BGPD/OBPD=20while=20it=E2=80=99s?=
 =?UTF-8?q?=20blocked=20still=20increases=20BGPI/OBPI=20if=20needed.=20Fix?=
 =?UTF-8?q?es=20#145?=
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---
 Core/memory.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Core/memory.c b/Core/memory.c
index 262fc4d..bf01d20 100644
--- a/Core/memory.c
+++ b/Core/memory.c
@@ -792,10 +792,15 @@ static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
                        is required. */
                     return;
                 }
+                
+                uint8_t index_reg = (addr & 0xFF) - 1;
                 if (gb->cgb_palettes_blocked) {
+                    if (gb->io_registers[index_reg] & 0x80) {
+                        gb->io_registers[index_reg]++;
+                        gb->io_registers[index_reg] |= 0x80;
+                    }
                     return;
                 }
-                uint8_t index_reg = (addr & 0xFF) - 1;
                 ((addr & 0xFF) == GB_IO_BGPD?
                  gb->background_palettes_data :
                  gb->sprite_palettes_data)[gb->io_registers[index_reg] & 0x3F] = value;