diff --git a/ram2e.c b/ram2e.c
index efefeb6..e90b7d4 100644
--- a/ram2e.c
+++ b/ram2e.c
@@ -55,6 +55,16 @@ static char auxram_detect() {
 	__asm__("sta $C009"); // Store in ALTZP
 	__asm__("sta $C073"); // Set RW bank 0
 
+	// Save RW bank 0 $00-03
+	__asm__("lda $00");
+	__asm__("pha");
+	__asm__("lda $01");
+	__asm__("pha");
+	__asm__("lda $02");
+	__asm__("pha");
+	__asm__("lda $03");
+	__asm__("pha");
+
 	// Store 00 FF 55 AA in RW bank 0 ZP
 	__asm__("lda #$00");
 	__asm__("sta $00");
@@ -81,11 +91,29 @@ static char auxram_detect() {
 
 	// Found aux ram card
 	__asm__("sta $C008"); // Don't store in ALTZP
+	// Restore RW bank 0 $00-03
+	__asm__("pla");
+	__asm__("sta $03");
+	__asm__("pla");
+	__asm__("sta $02");
+	__asm__("pla");
+	__asm__("sta $01");
+	__asm__("pla");
+	__asm__("sta $00");
 	return true;
 
 	// Not found
 	noramworks:
 	__asm__("sta $C008"); // Don't store in ALTZP
+	// Restore RW bank 0 $00-03
+	__asm__("pla");
+	__asm__("sta $03");
+	__asm__("pla");
+	__asm__("sta $02");
+	__asm__("pla");
+	__asm__("sta $01");
+	__asm__("pla");
+	__asm__("sta $00");
 	return false;
 }