From 5e4a1f6db78f51449d745c66e31c23017443b78e Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Fri, 23 Feb 2024 19:03:36 +0200
Subject: [PATCH] Adjust the handling of >4MB ISX files

---
 Core/gb.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Core/gb.c b/Core/gb.c
index e89cac8..b22a01c 100644
--- a/Core/gb.c
+++ b/Core/gb.c
@@ -549,7 +549,10 @@ int GB_load_isx(GB_gameboy_t *gb, const char *path)
                 bank = byte;
                 if (byte >= 0x80) {
                     READ(byte);
-                    bank |= byte << 8;
+                    /* TODO: This is just a guess, the docs don't elaborator on how banks > 0xFF are saved,
+                       other than the fact that banks >= 80 requires two bytes to store them, and I haven't
+                       encountered an ISX file for a ROM larger than 4MBs yet. */
+                    bank += byte << 7;
                 }
                 
                 READ(address);
@@ -603,7 +606,6 @@ int GB_load_isx(GB_gameboy_t *gb, const char *path)
                 uint8_t flag;
                 uint16_t bank;
                 uint16_t address;
-                uint8_t byte;
                 READ(count);
                 count = LE16(count);
                 while (count--) {