2 files changed, 23 insertions, 13 deletions
diff --git a/1_hello_world/main.c b/1_hello_world/main.c
index 5852765..ee4ee64 100644
--- a/1_hello_world/main.c
+++ b/1_hello_world/main.c
@@ -218,7 +218,7 @@ static void VDP_LoadRegisters(void)
     }
 }
 
-void __start(void)
+int main(void)
 {
     // ==============================================================
     //  Initialise the Mega Drive
diff --git a/1_hello_world/startup.c b/1_hello_world/startup.c
index 3b3c017..06ca39e 100644
--- a/1_hello_world/startup.c
+++ b/1_hello_world/startup.c
@@ -22,9 +22,11 @@ struct smd_header {
     char country_codes[16];
 };
 
-extern void __start(void);
-static void HSYNC_handler(void);
-static void VSYNC_handler(void);
+extern int main(void);
+static __attribute__((interrupt)) void __start(void);
+static __attribute__((interrupt)) void HSYNC_handler(void);
+static __attribute__((interrupt)) void VSYNC_handler(void);
+static __attribute__((interrupt)) void CPUException_handler(void);
 
 extern unsigned __stacktop;
 
@@ -32,13 +34,13 @@ __attribute__((section(".stack"), used)) unsigned *__stack_init = &__stacktop;
 
 __attribute__((section(".vectors"), used)) ptr_func_t __isr_vectors[] = {
     __start,
-    __start,
-    __start,
-    __start,
-    __start,
-    __start,
-    __start,
-    __start,
+    CPUException_handler,
+    CPUException_handler,
+    CPUException_handler,
+    CPUException_handler,
+    CPUException_handler,
+    CPUException_handler,
+    CPUException_handler,
     __start,
     __start,
     __start,
@@ -118,5 +120,13 @@ __attribute__((section(".smd_header"), used)) struct smd_header __smd_header = {
     .country_codes = "  E             ",
 };
 
-void HSYNC_handler(void) {}
-void VSYNC_handler(void) {}
+static void __start(void)
+{
+    main();
+}
+static void HSYNC_handler(void) {}
+static void VSYNC_handler(void) {}
+static void CPUException_handler(void)
+{
+     asm inline volatile ("  stop #2700");
+}