diff --git a/src/kernel/arch/x86/idt.h b/src/kernel/arch/x86/idt.h
index 0e94d4a..0fa2204 100644
--- a/src/kernel/arch/x86/idt.h
+++ b/src/kernel/arch/x86/idt.h
@@ -3,8 +3,6 @@
 
 #include <stdint.h>
 
-// Define the isr_regs structure
-
 // IDT entry structure
 struct idt_entry
 {
diff --git a/src/kernel/arch/x86/isr.c b/src/kernel/arch/x86/isr.c
index e7b2bea..5a348d9 100644
--- a/src/kernel/arch/x86/isr.c
+++ b/src/kernel/arch/x86/isr.c
@@ -12,8 +12,20 @@ enum
     SERIAL_PORT_INTERRUPT = 0x24
 };
 
+void dummy_isr(struct isr_regs *regs)
+{
+    printf("Timer interrupt occurred!\n");
+}
+
 // ISR table
-void (*isr_table[256])(struct isr_regs *regs);
+void (*isr_table[256])(struct isr_regs *regs) = {
+    // initialize the dummy isr_table
+    [TIMER_INTERRUPT]       = dummy_isr, // Timer interrupt
+    [KEYBOARD_INTERRUPT]    = dummy_isr, // Keyboard interrupt
+    [NETWORK_INTERRUPT]     = dummy_isr, // Network interrupt
+    [DISK_INTERRUPT]        = dummy_isr, // Disk interrupt
+    [SERIAL_PORT_INTERRUPT] = dummy_isr  // Serial port interrupt
+};
 
 // Register an ISR
 void isr_register(uint8_t num, void (*handler)(struct isr_regs *regs))
diff --git a/src/kernel/arch/x86/isr.h b/src/kernel/arch/x86/isr.h
index 86d753c..0b98787 100644
--- a/src/kernel/arch/x86/isr.h
+++ b/src/kernel/arch/x86/isr.h
@@ -3,6 +3,15 @@
 
 #include <stdint.h>
 
+struct isr_regs
+{
+    uint32_t gs, fs, es, ds;      // Segment selectors
+    uint32_t edi, esi, ebp, esp;  // Pushed by pusha instruction
+    uint32_t ebx, edx, ecx, eax;  // Pushed by the interrupt handler
+    uint32_t int_no, err_code;    // Interrupt number and error code (if applicable)
+    uint32_t eip, cs, eflags, esp_at_signal; // Pushed by the processor automatically
+};
+
 // Structure for storing register values during an ISR
 struct idt_regs
 {