diff --git a/core/cpu/opcodes.ts b/core/cpu/opcodes.ts
index 0d6d9a0..fc0669a 100644
--- a/core/cpu/opcodes.ts
+++ b/core/cpu/opcodes.ts
@@ -2208,7 +2208,8 @@ function handleOpcodeFx(opcode: i32): i32 {
       let registerAF1: i32 = <u16>sixteenBitLoadSyncCycles(stackPointer);
       Cpu.stackPointer = u16Portable(stackPointer + 2);
       Cpu.registerA = <u8>splitHighByte(registerAF1);
-      Cpu.registerF = <u8>splitLowByte(registerAF1);
+      // The low four bits of F always read 0
+      Cpu.registerF = <u8>(splitLowByte(registerAF1) & 0xf0);
       return 4;
     }
     case 0xf2: {
diff --git a/core/graphics/graphics.ts b/core/graphics/graphics.ts
index 13d70d6..1f58d1a 100644
--- a/core/graphics/graphics.ts
+++ b/core/graphics/graphics.ts
@@ -118,7 +118,7 @@ export class Graphics {
   static loadState(): void {
     // Graphics
     Graphics.scanlineCycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Graphics.saveStateSlot));
-    Graphics.scanlineRegister = load<u8>(getSaveStateMemoryOffset(0x04, Graphics.scanlineRegister));
+    Graphics.scanlineRegister = load<u8>(getSaveStateMemoryOffset(0x04, Graphics.saveStateSlot));
     Graphics.scrollX = load<u8>(getSaveStateMemoryOffset(0x05, Graphics.saveStateSlot));
     Graphics.scrollY = load<u8>(getSaveStateMemoryOffset(0x06, Graphics.saveStateSlot));
     Graphics.windowX = load<u8>(getSaveStateMemoryOffset(0x07, Graphics.saveStateSlot));
diff --git a/core/graphics/lcd.ts b/core/graphics/lcd.ts
index 446b0c8..2dd06d5 100644
--- a/core/graphics/lcd.ts
+++ b/core/graphics/lcd.ts
@@ -133,7 +133,7 @@ export function setLcdStatus(): void {
     if (scanlineCycleCounter >= MIN_CYCLES_SPRITES_LCD_MODE) {
       // Searching Sprites Atts
       newLcdMode = 2;
-    } else if (scanlineCycleCounter >= MIN_CYCLES_SPRITES_LCD_MODE) {
+    } else if (scanlineCycleCounter >= Graphics.MIN_CYCLES_TRANSFER_DATA_LCD_MODE()) {
       // Transferring data to lcd
       newLcdMode = 3;
     }
diff --git a/core/memory/writeTraps.ts b/core/memory/writeTraps.ts
index c14f5b4..6aa2b7b 100644
--- a/core/memory/writeTraps.ts
+++ b/core/memory/writeTraps.ts
@@ -98,8 +98,10 @@ export function checkWriteTraps(offset: i32, value: i32): boolean {
 
   // Serial
   if (offset === Serial.memoryLocationSerialTransferControl) {
-    // SC
-    return Serial.updateTransferControl(value);
+    // SC: unused bits read 1 (6-1 on DMG, 6-2 on CGB)
+    Serial.updateTransferControl(value);
+    eightBitStoreIntoGBMemory(offset, value | (Cpu.GBCEnabled ? 0x7c : 0x7e));
+    return false;
   }
 
   // Sound
diff --git a/core/sound/channel1.ts b/core/sound/channel1.ts
index e7f85a8..a45bcfe 100644
--- a/core/sound/channel1.ts
+++ b/core/sound/channel1.ts
@@ -245,7 +245,7 @@ export class Channel1 {
   // Function to load the save state from memory
   static loadState(): void {
     // Cycle Counter
-    Channel1.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel1.cycleCounter));
+    Channel1.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel1.saveStateSlot));
 
     // NRx0
     Channel1.NRx0SweepPeriod = load<u8>(getSaveStateMemoryOffset(0x04, Channel1.saveStateSlot));
diff --git a/core/sound/channel2.ts b/core/sound/channel2.ts
index 27278bc..4841a7b 100644
--- a/core/sound/channel2.ts
+++ b/core/sound/channel2.ts
@@ -204,7 +204,7 @@ export class Channel2 {
   // Function to load the save state from memory
   static loadState(): void {
     // Cycle Counter
-    Channel2.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel2.cycleCounter));
+    Channel2.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel2.saveStateSlot));
 
     // NRx0
     // No NRx0
diff --git a/core/sound/channel3.ts b/core/sound/channel3.ts
index 1c6fd18..19a21e9 100644
--- a/core/sound/channel3.ts
+++ b/core/sound/channel3.ts
@@ -191,7 +191,7 @@ export class Channel3 {
   // Function to load the save state from memory
   static loadState(): void {
     // Cycle Counter
-    Channel3.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel3.cycleCounter));
+    Channel3.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel3.saveStateSlot));
 
     // NRx0
     // No NRx0
diff --git a/core/sound/channel4.ts b/core/sound/channel4.ts
index 378414a..531213d 100644
--- a/core/sound/channel4.ts
+++ b/core/sound/channel4.ts
@@ -194,7 +194,7 @@ export class Channel4 {
   // Function to load the save state from memory
   static loadState(): void {
     // Cycle Counter
-    Channel4.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel4.cycleCounter));
+    Channel4.cycleCounter = load<i32>(getSaveStateMemoryOffset(0x00, Channel4.saveStateSlot));
 
     // NRx0
     // No NRx0