diff --git a/src/boards/datalatch.c b/src/boards/datalatch.c
index c13454b..be7bd9b 100644
--- a/src/boards/datalatch.c
+++ b/src/boards/datalatch.c
@@ -94,7 +94,7 @@ static DECLFW(NROMWrite) {
 static void NROMPower(void) {
 	setprg8r(0x10, 0x6000, 0);	/* Famili BASIC (v3.0) need it (uses only 4KB), FP-BASIC uses 8KB */
 	setprg16(0x8000, 0);
-	setprg16(0xC000, ~0);
+	setprg16(0xC000, 1);
 	setchr8(0);
 
 	SetReadHandler(0x6000, 0x7FFF, CartBR);