diff --git a/src/video/vid_tgui9440.c b/src/video/vid_tgui9440.c
index a95da1056..bac0242e1 100644
--- a/src/video/vid_tgui9440.c
+++ b/src/video/vid_tgui9440.c
@@ -483,7 +483,8 @@ tgui_out(uint16_t addr, uint8_t val, void *p)
 						break;
 
 					case 0x37:
-						i2c_gpio_set(tgui->i2c, (val & 0x02) || !(val & 0x04), (val & 0x01) || !(val & 0x08));
+						if (tgui->type >= TGUI_9440)
+							i2c_gpio_set(tgui->i2c, (val & 0x02) || !(val & 0x04), (val & 0x01) || !(val & 0x08));
 						break;
 
 					case 0x40: case 0x41: case 0x42: case 0x43:
@@ -609,7 +610,7 @@ tgui_in(uint16_t addr, void *p)
                 return svga->crtcreg;
                 case 0x3D5:
 		temp = svga->crtc[svga->crtcreg];
-		if (svga->crtcreg == 0x37) {
+		if ((svga->crtcreg == 0x37) && (tgui->type >= TGUI_9440)) {
 			if (!(temp & 0x04)) {
                                 temp &= ~0x02;
                                 if (i2c_gpio_get_scl(tgui->i2c))