diff --git a/PSNee/MCU.h b/PSNee/MCU.h
index 029337a..054cb64 100644
--- a/PSNee/MCU.h
+++ b/PSNee/MCU.h
@@ -1,6 +1,6 @@
 // *****************************************************************************************************************
-// Configuration for different microcontrollers (MCU) to ensure compatibility with the code:
-// - Defines the clock speed, timers, and interrupts for each MCU.
+// Configuration for different microcontrollers (MUC) to ensure compatibility with the code:
+// - Defines the clock speed, timers, and interrupts for each MUC.
 // - Configures I/O pins for data, clocks, and switches according to the requirements.
 // - Enables pull-up resistors on input pins where needed.
 // - Manages external interrupts and LED outputs for system feedback.
@@ -8,89 +8,219 @@
 // *****************************************************************************************************************
 
 //******************************************************************************************************************
-// Configuring the clock speed and associated registers. The formula for calculating
+// Configuring the clock speed and associated registers. The formula for calculating 
 // the clock frequency is F_CPU / (TCCR0B |= (1<<CS00)) * (OCR0A = 159 +1) = 16000000 / (0 * (160)) = 100KHz
 //******************************************************************************************************************
 
 //******************************************************************************************************************
-// Example: DDRB &= ~(1<<DDB0);  // Create a mask by shifting the bit 1 to the left by DDB0's position (bit 0), and then inverting it.
-// The bitwise AND operation (&=) updates the register DDRB by clearing the DDB0 bit (setting it to 0)
-// without affecting the other bits.
+
+// Example: DDRB &= ~(1<<DDB0);
+
+// Define the pins as inputs.
+
+// Create a mask by shifting the bit 1 to the left by DDB0's position (bit 0), and then inverting it.
+// The bitwise AND operation (&=) updates the register DDRB by clearing the DDB0 bit (setting it to 0) 
+// without affecting the other bits. 
 //
-// For instance, if DDRB = b11111111 (binary value), the operation shifts the bit 1 to the left to create the mask
+// For instance, if DDRB = b11111111 (binary value), the operation shifts the bit 1 to the left to create the mask 
 // (1<<DDB0) = b00000001, and then inverts it, which results in b11111110. The AND operation with DDRB clears DDB0.
-//
+// 
 // Before:  DDRB = b11111111  // Initial value of DDRB (all pins set as output)
 // Mask:    ~(b00000001) = b11111110  // Mask generated by shifting and inverting the bit
 // After:   DDRB = b11111110  // The DDB0 bit is cleared (set to 0), while other bits remain unchanged
 //******************************************************************************************************************
 
 //******************************************************************************************************************
-// Example: DDRB |= (1<<DDB0);  // Create a mask by shifting the bit 1 to the left by DDB0's position (bit 0),
+
+// Example: DDRB |= (1<<DDB0);
+
+// Enable pull-ups and set high on the pins.
+
+// Create a mask by shifting the bit 1 to the left by DDB0's position (bit 0), 
 // and then apply a bitwise OR operation to set DDB0 to 1 (configure pin PB0 as an output).
 //
-// For instance, if DDRB = b11111111 (binary value), the operation shifts the bit 1 to the left to create the mask
+// For instance, if DDRB = b11111111 (binary value), the operation shifts the bit 1 to the left to create the mask 
 // (1<<DDB0) = b00000001. The OR operation with DDRB sets the DDB0 bit to 1, leaving other bits unchanged.
-//
+// 
 // Before:  DDRB = b11111111  // Initial value of DDRB (all pins set as output)
 // Mask:    (1<<DDB0) = b00000001  // Mask generated by shifting the bit 1 to the left to position DDB0
 // After:   DDRB = b11111111  // The DDB0 bit is set to 1, configuring pin PB0 as an output
 //******************************************************************************************************************
 
 //******************************************************************************************************************
-// Example: (PIND & (1<<PIND6));  // Create a mask by shifting the bit 1 to the left by PIND6's position (bit 6),
-// and then apply a bitwise AND operation to read the state of the PIND6 pin.
+
+// Example: (PIND & (1<<PIND6));
+
+// Read the state of the input pins Equivalent.
+
+// Create a mask by shifting the bit 1 to the left by PIND6's position (bit 6), 
+// and then apply a bitwise AND operation to read the state of the PIND6 pin. 
 // The result will be non-zero (true) if the PIND6 pin is high (1), and zero (false) if the PIND6 pin is low (0).
 //
-// For instance, if PIND = b10101010 (binary value), the operation shifts the bit 1 to the left to create the mask
+// For instance, if PIND = b10101010 (binary value), the operation shifts the bit 1 to the left to create the mask 
 // (1<<PIND6) = b01000000. The AND operation between PIND and the mask checks if the 6th bit is set to 1 (high).
-//
+// 
 // Before:  PIND = b10101010  // Initial value of PIND (register containing input pin states)
 // Mask:    (1<<PIND6) = b01000000  // Mask generated by shifting the bit 1 to the left to position PIND6
 // Operation: PIND & b01000000 = b00000000 // If PIND6 is low (0)
 // Operation: PIND & b01000000 = b01000000 // If PIND6 is high (1)
+// 
+//******************************************************************************************************************
+
+//******************************************************************************************************************
+
+// Example: PORTB |= (1<<PB0);
+
+// Set the state of an output pin to HIGH (Equivalent of Arduino digitalWrite(8, HIGH);).
+
+// Create a mask by shifting the bit 1 to the left by PB0's position (bit 0),
+// and then apply a bitwise OR operation to force the PB0 pin to a high state.
+// This operation modifies only the target bit without affecting the others in the register.
+//
+// For instance, if PORTB = b10101010 (binary value), the operation shifts the bit 1 to the left to create the mask
+// (1<<PB0) = b00000001. The OR operation between PORTB and the mask ensures the 0th bit becomes 1 (high).
+//
+// Before: PORTB = b10101010 // Initial value of PORTB (register controlling output pin states)
+// Mask: (1<<PB0) = b00000001 // Mask generated by shifting the bit 1 to the left to position PB0
+// Operation: PORTB | b00000001 = b10101011 // The 0th bit is set to 1 (high)
 //
 //******************************************************************************************************************
 
 //******************************************************************************************************************
-// Example: EICRA |= (1<<ISC01) | (1<<ISC00);
-// This operation configures the external interrupt sense control (ISC) for interrupt INT0 (External Interrupt Request 0).
-// Specifically, it sets the mode of INT0 to "rising edge" trigger, meaning the interrupt will be triggered when the pin
-// transitions from low to high (rising edge).
+
+// Example: PORTB &= ~(1<<PB0);
+
+// Set the state of an output pin to LOW (Equivalent of Arduino digitalWrite(8, LOW);).
+
+// Create a mask by shifting the bit 1 to the left by PB0's position (bit 0).
+// The mask is then inverted at the bit level (binary NOT) to create a clearing mask (all bits are 1 except the target bit, which is 0).
+// Finally, a bitwise AND operation is applied to force the PB0 pin to a low state.
+// This operation modifies only the target bit without affecting the others in the register.
 //
-// EICRA (External Interrupt Control Register A) controls how external interrupts INT0 and INT1 are triggered.
-// The bits ISC01 and ISC00 in this register define the trigger mode for interrupt INT0.
+// For instance, if PORTB = b10101011 (binary value), the generated mask is (1<<PB0) = b00000001.
+// Inverting (NOT) the mask yields ~(1<<PB0) = b11111110.
+// The bitwise AND operation between PORTB and the clearing mask ensures the 0th bit becomes 0 (low).
 //
-// - Setting ISC01 to 1 and ISC00 to 1 (via the OR operation) configures INT0 to trigger on the rising edge.
+// Before: PORTB = b10101011 // Initial value of PORTB (register controlling output pin states)
+// Mask: ~(1<<PB0) = b11111110 // Generated clearing mask
+// Operation: PORTB & b11111110 = b10101010 // The 0th bit is set to 0 (low)
 //
-// Before:  EICRA = b00000000  // Initial value of EICRA, all interrupt sense control bits are cleared (no trigger mode set).
-// Operation: EICRA |= (1<<ISC01) | (1<<ISC00)  // Set ISC01 and ISC00 to 1 for rising edge trigger.
-// After:   EICRA = b00000011  // The bits ISC01 and ISC00 are now set, configuring INT0 to trigger on rising edge.
-//
-// This technique is commonly used to configure external interrupts to trigger based on specific events like a rising
-// or falling edge on the external interrupt pin (INT0 or INT1).
 //******************************************************************************************************************
 
 //******************************************************************************************************************
-// Example: EICRA = (EICRA & ~(1<<ISC00)) | (1<<ISC01);
-// This operation configures the external interrupt sense control (ISC) for interrupt INT0 (External Interrupt Request 0).
-// Specifically, it sets INT0 to trigger on a "falling edge" (when the signal transitions from high to low).
+
+// Enables (masks in) the Hardware External Interrupt 0 (INT0).
+
+// Equivalent to the Arduino function: attachInterrupt(digitalPinToInterrupt(2), myFunctionName, CHANGE);
 //
-// The bits ISC01 and ISC00 in the EICRA register define how the external interrupt INT0 is triggered. The operation
-// clears the bit ISC00 while setting ISC01 to 1, configuring INT0 to trigger when the pin transitions from high to low,
-// i.e., on the falling edge.
+// Example: EIMSK |= (1<<INT0);
 //
-// EICRA (External Interrupt Control Register A) controls how external interrupts INT0 and INT1 are triggered.
-// - ISC01 = 1, ISC00 = 0 configures INT0 to trigger on falling edge (high to low transition).
+// Creates a mask by shifting the bit 1 to the left to the position of the INT0 bit.
+// A bitwise OR operation is then applied to the EIMSK (External Interrupt Mask Register) register to set that specific bit to 1.
+// Enabling this bit tells the microcontroller to start listening for signals on the physical pin associated with INT0 (typically Pin D2 on the Arduino UNO/Nano).
 //
+// For instance, if EIMSK = b00000000 (all interrupts disabled), the generated mask is (1<<INT0) = b00000001 (assuming INT0 is defined as 0).
+// The bitwise OR operation ensures the INT0 bit is set to 1, without affecting the other interrupts.
+//
+// Before: EIMSK = b00000000 // All interrupts disabled
+// Mask: (1<<INT0) = b00000001 // Generated enable mask
+// Operation: EIMSK | b00000001 = b00000001 // The INT0 interrupt is now enabled
+//
+//******************************************************************************************************************
+
+//******************************************************************************************************************
+
+// Disables (masks out) the Hardware External Interrupt 0 (INT0).
+
+// Equivalent to the Arduino function: detachInterrupt(digitalPinToInterrupt(2));
+//
+// Example: EIMSK &= ~(1<<INT0);
+//
+// Creates a mask by shifting the bit 1 to the left by the position of the INT0 bit.
+// The mask is then inverted at the bit level (binary NOT) to create a clearing mask (all bits are 1 except the target bit, which is 0).
+// A bitwise AND operation is applied to the EIMSK (External Interrupt Mask Register) register to force that specific bit to 0.
+// Disabling this bit tells the microcontroller to stop listening for signals on the physical pin associated with INT0 (typically Pin D2 on the Arduino UNO/Nano).
+//
+// For instance, if EIMSK = b00000001 (INT0 interrupt is enabled), the generated mask is (1<<INT0) = b00000001.
+// Inverting (NOT) the mask yields ~(1<<INT0) = b11111110.
+// The bitwise AND operation between EIMSK and the clearing mask ensures the INT0 bit becomes 0 (disabled).
+//
+// Before: EIMSK = b00000001 // INT0 interrupt is enabled
+// Mask: ~(1<<INT0) = b11111110 // Generated disable mask
+// Operation: EIMSK & b11111110 = b00000000 // The INT0 interrupt is now disabled
+//
+//******************************************************************************************************************
+
+//******************************************************************************************************************
+
+// Configures the external interrupt 0 (INT0) to trigger on a RISING edge (when the signal goes from LOW to HIGH).
+
+// Equivalent to the Arduino function: attachInterrupt(digitalPinToInterrupt(2), myFunctionName, RISING);
+//
+// Example: EICRA |= (1<<ISC01)|(1<<ISC00);
+//
+// This operation sets both the ISC01 and ISC00 bits within the EICRA register (External Interrupt Control Register A) to 1.
+// These two bits together form a 2-bit control field that determines how the INT0 pin should react to changes in voltage.
+// The specific combination of ISC01=1 and ISC00=1 defines the "RISING Edge" mode according to the AVR datasheet.
+//
+// EICRA register (simplified view of relevant bits):
+// | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 (ISC01) | Bit 0 (ISC00) |
+// | :---: | :---: | :---: | :---: | :---: | :---: | :-----------: | :-----------: |
+// | | | | | | | 1 | 1 |
+//
+// The bitwise OR (|=) ensures that only these two specific bits are modified, leaving all other interrupt configurations unchanged.
+//
+// Before: EICRA = b00000000 // Default state (usually LOW level triggers)
+// Mask: (1<<ISC01)|(1<<ISC00) = b00000011 // Mask to set both bits 0 and 1
+// Operation: EICRA | b00000011 = b00000011 // INT0 is now configured for RISING edge triggers
+//
+//******************************************************************************************************************
+
+//******************************************************************************************************************
+
+// Configures the external interrupt 0 (INT0) to trigger on a FALLING edge (when the signal goes from HIGH to LOW).
+// Equivalent to the Arduino function: attachInterrupt(digitalPinToInterrupt(2), myFunctionName, FALLING);
+//
+// Example: (EICRA = (EICRA & ~(1<<ISC00)) | (1<<ISC01));
+//
+// This combined operation first ensures that the ISC00 bit is cleared to 0 (& ~(1<<ISC00)), and then sets the ISC01 bit to 1 (| (1<<ISC01)).
+// These two bits together form a 2-bit control field that determines how the INT0 pin should react to changes in voltage.
+// The specific combination of ISC01=1 and ISC00=0 defines the "FALLING Edge" mode according to the AVR datasheet.
+//
+// EICRA register (simplified view of relevant bits):
+// | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 (ISC01) | Bit 0 (ISC00) |
+// | :---: | :---: | :---: | :---: | :---: | :---: | :-----------: | :-----------: |
+// | | | | | | | 1 | 0 |
+//
+// The complex bitwise operation ensures that we set a specific 2-bit value while leaving other unrelated bits in the EICRA register unchanged.
+//
+// Operation Breakdown:
+// 1. Clear ISC00 bit: EICRA & ~(1<<ISC00)
+// 2. Set ISC01 bit: ... | (1<<ISC01)
 // Before:  EICRA = b00000011  // Initial value with ISC01 = 1 and ISC00 = 1 (rising edge trigger for INT0)
 // Operation: EICRA & ~(1<<ISC00) clears ISC00 bit (sets it to 0) while keeping ISC01 at 1. Then OR operation with (1<<ISC01) ensures ISC01 stays 1.
 // After:   EICRA = b00000010  // The bit ISC00 is now cleared, configuring INT0 to trigger on the falling edge.
 //
-// This technique is used to configure the interrupt to trigger on the falling edge (transition from high to low),
-// without changing the state of other control bits in the EICRA register.
 //******************************************************************************************************************
 
+//******************************************************************************************************************
+// Identifier for the Interrupt Vector for External Interrupt 0 (INT0).
+//
+// Example: ISR(INT0_vect) { ... }
+//
+// This is not an executable instruction but a symbolic name (an alias or macro) defined in the AVR-GCC header files
+// (<avr/interrupt.h>). It points to the specific memory address in the microcontroller's flash memory where the
+// Interrupt Service Routine (ISR) for the INT0 event must reside.
+//
+// When you write ISR(INT0_vect) { ... }, you are telling the compiler: "Place this block of code at the
+// location the CPU jumps to when a hardware signal is detected on the INT0 pin."
+//
+// In Arduino code, this identifier is hidden from the user and managed internally by the
+// attachInterrupt() function.
+//
+//******************************************************************************************************************
+
+
 #pragma once
 
 
diff --git a/PSNee/PSNee.ino b/PSNee/PSNee.ino
index 7408b7a..cd41205 100644
--- a/PSNee/PSNee.ino
+++ b/PSNee/PSNee.ino
@@ -82,10 +82,12 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 
 /*  
   Fuses  
-  MCU    | High | Low | Extended
+  MCU             | High | Low | Extended
   --------------------------------------------------
-  ATmega | DF   | EE  | FF 
-  ATtiny | DF   | E2  | FF
+  ATmega 328/168  | DF   | EE  | FD 
+  ATmega32U4_16U4 | DF   | EE  | FB
+  ATtiny          | DF   | E2  | FF
+  ATmega 328PB    | DF   | EE  | F5
 
   Pinout
   Arduino   | PSNee     |
@@ -130,8 +132,12 @@ uint8_t wfck_mode = 0;
 
 // --- Prototypes (Forward declarations) ---
 // These tell the compiler that the functions exist later in the code.
-void logic_Standard(uint8_t isDataSector);
+
+//#ifdef SCPH_5903
 void logic_SCPH_5903(uint8_t isDataSector);
+//#else
+void logic_Standard(uint8_t isDataSector);
+//#endif
 
 // Function pointer type definition for the console detection logic.
 // This allows switching between 'Standard' and 'SCPH-5903' heuristics dynamically.
@@ -167,7 +173,7 @@ uint8_t hysteresis = 0;
 
   Traditionally, the WFCK signal was called GATE. This is because, on early models, 
   modchips acted like a gate that would open to pull the signal down
-   at the exact moment the region code was being passed (which is still the case today).
+  at the exact moment the region code was being passed (which is still the case today).
 
   During the initialization and region protection zone reading phases, 
   the WFCK clock frequency is approximately 7.3 kHz.
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