diff --git a/src/spider/runtime/cpu/CPU_test.cpp b/src/spider/runtime/cpu/CPU_test.cpp
new file mode 100644
index 0000000..def7101
--- /dev/null
+++ b/src/spider/runtime/cpu/CPU_test.cpp
@@ -0,0 +1,25 @@
+#include "CPU.hpp"
+
+namespace spider {
+
+    CPU::CPU()
+    :   RA{}, RB{}, RC{}, RD{},
+        RX{}, RY{}, R0{}, R1{},
+        R2{}, R3{}, R4{}, R5{},
+        R6{}, R7{}, R8{}, R9{},
+        RF{}, RI{}, RS{}, RZ{},
+        RE{}, RN{}, RV{}, RM{}
+    {}
+
+    CPU::~CPU() {}
+
+    // Stubs for testing
+    void CPU::fetchOperDst() { /* _dst already set manually in tests */ }
+    void CPU::fetchOperSrc() { /* _src already set manually in tests */ }
+    void CPU::imp()          { /* no-op post action */ }
+    void CPU::hookRAM(RAM*)  {}
+    void CPU::hookInstrReel(InstrReel*) {}
+    void CPU::fetchInstr()   {}
+    void CPU::execute()      {}
+    void CPU::psw()          {}
+}
\ No newline at end of file
diff --git a/src/spider/test_instrucciones.cpp b/src/spider/test_instrucciones.cpp
new file mode 100644
index 0000000..dab20b6
--- /dev/null
+++ b/src/spider/test_instrucciones.cpp
@@ -0,0 +1,118 @@
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+#ifndef M_E
+#define M_E 2.71828182845904523536
+#endif
+
+#include <spider/runtime/cpu/CPU.hpp>
+#include <iostream>
+#include <cmath>
+
+using namespace spider;
+
+void check(const char* name, double result, double expected, double tolerance = 1e-9) {
+    bool ok = std::abs(result - expected) <= tolerance;
+    std::cout << (ok ? "[PASS] " : "[FAIL] ") << name
+              << " = " << result
+              << " (expected " << expected << ")\n";
+}
+
+int main() {
+    std::cout << "=== Spider VM Instruction Test: 0x068-0x079 ===\n\n";
+
+    CPU cpu;
+    cpu._post = &CPU::imp;
+
+    std::cout << "-- Cast Instructions --\n";
+
+    cpu.RA._f64 = 3.9;
+    cpu._dst = &cpu.RA;
+    cpu.D2I();
+    check("D2I (3.9 -> 3)", cpu.RA._u32, 3.0);
+
+    cpu.RA._f64 = 1e12;
+    cpu._dst = &cpu.RA;
+    cpu.D2L();
+    check("D2L (1e12)", (double)cpu.RA._u64, 1e12);
+
+    std::cout << "\n-- Trigonometric Instructions --\n";
+
+    cpu.RA._f64 = M_PI / 2.0;
+    cpu._dst = &cpu.RA;
+    cpu.SIN();
+    check("SIN(pi/2)", cpu.RA._f64, 1.0);
+
+    cpu.RA._f64 = 0.0;
+    cpu._dst = &cpu.RA;
+    cpu.COS();
+    check("COS(0)", cpu.RA._f64, 1.0);
+
+    cpu.RA._f64 = M_PI / 4.0;
+    cpu._dst = &cpu.RA;
+    cpu.TAN();
+    check("TAN(pi/4)", cpu.RA._f64, 1.0);
+
+    cpu.RA._f64 = 1.0;
+    cpu._dst = &cpu.RA;
+    cpu.ASIN();
+    check("ASIN(1.0)", cpu.RA._f64, M_PI / 2.0);
+
+    cpu.RA._f64 = 1.0;
+    cpu._dst = &cpu.RA;
+    cpu.ACOS();
+    check("ACOS(1.0)", cpu.RA._f64, 0.0);
+
+    cpu.RA._f64 = 1.0;
+    cpu._dst = &cpu.RA;
+    cpu.ATAN();
+    check("ATAN(1.0)", cpu.RA._f64, M_PI / 4.0);
+
+    cpu.RA._f64 = 1.0;
+    cpu.RB._f64 = 1.0;
+    cpu._dst = &cpu.RA;
+    cpu._src = &cpu.RB;
+    cpu.ATAN2();
+    check("ATAN2(1,1)", cpu.RA._f64, M_PI / 4.0);
+
+    std::cout << "\n-- Exponential Instructions --\n";
+
+    cpu.RA._f64 = 1.0;
+    cpu._dst = &cpu.RA;
+    cpu.EXP();
+    check("EXP(1)", cpu.RA._f64, M_E);
+
+    cpu.RA._f64 = M_E;
+    cpu._dst = &cpu.RA;
+    cpu.LOG();
+    check("LOG(e)", cpu.RA._f64, 1.0);
+
+    cpu.RA._f64 = 100.0;
+    cpu.RB._f64 = 10.0;
+    cpu._dst = &cpu.RA;
+    cpu._src = &cpu.RB;
+    cpu.LOGAB();
+    check("LOGAB(100,10)", cpu.RA._f64, 2.0);
+
+    cpu.RA._f64 = 2.0;
+    cpu.RB._f64 = 10.0;
+    cpu._dst = &cpu.RA;
+    cpu._src = &cpu.RB;
+    cpu.POW();
+    check("POW(2,10)", cpu.RA._f64, 1024.0);
+
+    cpu.RA._f64 = 9.0;
+    cpu._dst = &cpu.RA;
+    cpu.SQRT();
+    check("SQRT(9)", cpu.RA._f64, 3.0);
+
+    cpu.RA._f64 = 27.0;
+    cpu.RB._f64 = 3.0;
+    cpu._dst = &cpu.RA;
+    cpu._src = &cpu.RB;
+    cpu.ROOT();
+    check("ROOT(27,3)", cpu.RA._f64, 3.0);
+
+    std::cout << "\n=== Tests complete ===\n";
+    return 0;
+}
\ No newline at end of file