# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1498015930 -10800
# Node ID df2c6b3c6f2ed7157737688896bd5261ee0b06ac
# Parent  ea70f3da150fd983ee6f12c57573732367de3bec
added NTSC/PAL detection

diff -r ea70f3da150f -r df2c6b3c6f2e src/io.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/io.h	Wed Jun 21 06:32:10 2017 +0300
@@ -0,0 +1,13 @@
+#ifndef MEGADRIVE_IO_H_
+#define MEGADRIVE_IO_H_
+
+#define IO_REG_VER	*((volatile uint8_t*)0xa10001)
+
+enum {
+	IO_VER_VERSION_MASK = 0x0f,
+	IO_VER_EXP		= 0x20,
+	IO_VER_PAL		= 0x40,
+	IO_VER_NONJP	= 0x80
+};
+
+#endif	/* MEGADRIVE_IO_H_ */
diff -r ea70f3da150f -r df2c6b3c6f2e src/main.c
--- a/src/main.c	Tue Jun 20 06:08:58 2017 +0300
+++ b/src/main.c	Wed Jun 21 06:32:10 2017 +0300
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include "vdp.h"
+#include "io.h"
 #include "tun_data.h"
 
 #define NAMETAB_A	6
@@ -31,7 +32,9 @@
 
 	vdp_init();
 
-	vdp_setreg(VDP_REG_MODE2, vdp_getreg(VDP_REG_MODE2) | VDP_MODE2_V30CELL);
+	if(IO_REG_VER & IO_VER_PAL) {
+		vdp_setreg(VDP_REG_MODE2, vdp_getreg(VDP_REG_MODE2) | VDP_MODE2_V30CELL);
+	}
 
 	vdp_begin_palette(0, 0);
 	for(i=0; i<16; i++) {