diff --git a/src/boards/592.c b/src/boards/592.c
index 3c91f35..3185658 100644
--- a/src/boards/592.c
+++ b/src/boards/592.c
@@ -21,14 +21,21 @@
 #include "mapinc.h"
 #include "asic_latch.h"
 
+static uint8 submapper;
+
 static void sync () {
-	setprg16(0x8000, Latch_data);
-	setprg16(0xC000, Latch_data);
+	if (submapper == 1)
+		setprg32(0x8000, Latch_data);
+	else {
+		setprg16(0x8000, Latch_data);
+		setprg16(0xC000, Latch_data);
+	}
 	setchr8(Latch_data);
 	setmirror(Latch_data &0x08? MI_H: MI_V);
 }
 
 void Mapper592_Init (CartInfo *info) {
+	submapper = info->submapper;
 	Latch_init(info, sync, 0x8000, 0xFFFF, NULL);
 	info->Reset = Latch_clear;
 }
diff --git a/src/boards/8in1.c b/src/boards/8in1.c
index 68b8af1..6498caf 100644
--- a/src/boards/8in1.c
+++ b/src/boards/8in1.c
@@ -27,7 +27,7 @@
 #include "mapinc.h"
 #include "mmc3.h"
 
-uint8 submapper;
+static uint8 submapper;
 
 static void BMC8IN1CW(uint32 A, uint8 V) {
 	setchr1(A, ((EXPREGS[0] & 0xC) << 5) | (V & 0x7F));