diff --git a/core/ARM/cpu.h b/core/ARM/cpu.h
index c2ca23c..c8fc3aa 100644
--- a/core/ARM/cpu.h
+++ b/core/ARM/cpu.h
@@ -11,7 +11,28 @@ struct CPU {
 
     CPU() { std::memset(memory, 0, MEM_SIZE); }
 
-    uint64_t& x(int i) { return regs[i]; }
+    uint64_t &x(int i) { return regs[i]; }
+
+    uint8_t read_byte(uint64_t addr) {
+        if (addr >= MEM_SIZE) {
+            printf("%s out of bounds\n", addr);
+        }
+        return memory[addr];
+    }
+
+    void write_byte(uint64_t addr, uint8_t byte) {
+        if (addr >= MEM_SIZE) {
+            printf("%s out of bounds\n", addr);
+        }
+        memory[addr] = byte;
+    }
+
+    void print_debug_information() {
+        printf("PC = %lu\n", pc);
+        for (int reg = 0; reg < 32; reg++) {
+            printf("X%i = %lu\n", reg, x(reg)); // X0 = 0...
+        }
+    }
 };
 
 #endif
\ No newline at end of file
diff --git a/ui/main.cpp b/ui/main.cpp
index c602897..2be23b8 100644
--- a/ui/main.cpp
+++ b/ui/main.cpp
@@ -3,20 +3,23 @@
 
 #include <cstdio>
 
-int main()
-{
+int main() {
     CPU cpu;
     cpu.pc = 0;
 
     // Simple ARMv8 program in memory (MOVZ X0, #5; ADD X0, X0, #3; RET)
     // These are placeholders; real encoding will be parsed later
-    cpu.memory[0] = 0x05; // MOVZ placeholder
-    cpu.memory[4] = 0x03; // ADD placeholder
-    cpu.memory[8] = 0xFF; // RET placeholder
+    cpu.write_byte(0, 0x05); // MOVZ placeholder
+    cpu.write_byte(4, 0x03); // ADD placeholder
+    cpu.write_byte(8, 0xFF); // RET placeholder
+
+    printf("%u\n", cpu.read_byte(0));
 
     JIT jit;
     jit.translate_and_run(cpu);
 
-    printf("X0 = %llu\n", cpu.regs[0]);
+    cpu.print_debug_information();
+
+    printf("X0 = %lu\n", cpu.x(0));
     return 0;
 }
\ No newline at end of file