diff --git a/src/spider/SpiderRuntime.cpp b/src/spider/SpiderRuntime.cpp
index cffd95a..8c84608 100644
--- a/src/spider/SpiderRuntime.cpp
+++ b/src/spider/SpiderRuntime.cpp
@@ -6,6 +6,8 @@
 
 namespace spider {
 
+    const u32 RUNTIME_VERSION_NO = 0x00000000; // v0.1
+    const std::string RUNTIME_VERSION = "alpha v0.1";
     
 
 }
diff --git a/src/spider/SpiderRuntime.hpp b/src/spider/SpiderRuntime.hpp
index 6f87fd0..744b6e2 100644
--- a/src/spider/SpiderRuntime.hpp
+++ b/src/spider/SpiderRuntime.hpp
@@ -4,6 +4,9 @@
 
 namespace spider {
 
+    extern const u32 RUNTIME_VERSION_NO;
+    extern const std::string RUNTIME_VERSION;
+
     class Runtime;
     class CPU;
     class RAM;
diff --git a/src/spider/runtime/Runtime.cpp b/src/spider/runtime/Runtime.cpp
index 461f093..e46bfc4 100644
--- a/src/spider/runtime/Runtime.cpp
+++ b/src/spider/runtime/Runtime.cpp
@@ -4,17 +4,33 @@ namespace spider {
 
     // Constructors & Destructors //
 
-    Runtime::Runtime() : ram(0) {}
+    Runtime::Runtime() : Runtime(0) {}
 
-    Runtime::Runtime(u64 ramSize) : ram(ramSize) {}
+    Runtime::Runtime(u64 ramSize) : ram(ramSize), reel(nullptr) {
+        cpu.hookRAM(&ram);
+    }
 
-    Runtime::~Runtime() {}
+    Runtime::~Runtime() {
+        delete reel;
+    }
 
     // Stepping/Running the Machine //
 
-    void Runtime::step() {}
+    void Runtime::step() {
+        cpu.fetchInstr();
+        // TODO: Call instruction
+    }
 
-    void Runtime::step(u64 n) {}
+    void Runtime::step(u64 n) {
+        while(n >= 4) {
+            step();
+            step();
+            step();
+            step();
+            n -= 4;
+        }
+        while (n--) step();
+    }
 
     void Runtime::run() {}
 
@@ -26,4 +42,12 @@ namespace spider {
         ram.resize(length);
     }
 
+    /**
+     * Non-owning reel setup.
+     */
+    void Runtime::hookReel(InstrReel* reel, bool own) {
+        cpu.hookInstrReel(reel);
+        if(own) this->reel = reel;
+    }
+
 }
diff --git a/src/spider/runtime/Runtime.hpp b/src/spider/runtime/Runtime.hpp
index 6541690..dba8bbc 100644
--- a/src/spider/runtime/Runtime.hpp
+++ b/src/spider/runtime/Runtime.hpp
@@ -1,8 +1,11 @@
 #pragma once
 
 #include <spider/runtime/cpu/CPU.hpp>
+
 #include <spider/runtime/memory/RAM.hpp>
 
+#include <spider/runtime/reel/InstrReel.hpp>
+
 namespace spider {
 
     /**
@@ -14,6 +17,7 @@ namespace spider {
 
         CPU cpu;
         RAM ram;
+        InstrReel* reel;
 
     public:
 
@@ -68,6 +72,11 @@ namespace spider {
          */
         void resizeRAM(u64 length);
 
+        /**
+         * Non-owning reel setup.
+         */
+        void hookReel(InstrReel* reel, bool own = false);
+
     };
 
 }
diff --git a/src/spider/runtime/common.hpp b/src/spider/runtime/common.hpp
index 3507fc0..d8f3d61 100644
--- a/src/spider/runtime/common.hpp
+++ b/src/spider/runtime/common.hpp
@@ -5,6 +5,7 @@
 #include <deque>
 #include <map>
 #include <optional>
+#include <string>
 
 namespace spider {
 
diff --git a/src/spider/runtime/cpu/CPU.cpp b/src/spider/runtime/cpu/CPU.cpp
index 3c9d3f5..17366ff 100644
--- a/src/spider/runtime/cpu/CPU.cpp
+++ b/src/spider/runtime/cpu/CPU.cpp
@@ -3,6 +3,7 @@
 #include <spider/runtime/native/machine.hpp>
 
 #include <spider/runtime/memory/RAM.hpp>
+#include <spider/runtime/memory/Types.hpp>
 
 #include <spider/runtime/reel/InstrReel.hpp>
 
@@ -14,13 +15,15 @@ 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{},
-        ALU0{},
+          RX{}, RY{}, R0{}, R1{},
+          R2{}, R3{}, R4{}, R5{},
+          R6{}, R7{}, R8{}, R9{},
+          RF{}, RI{}, RS{}, RZ{},
+          RE{}, RN{}, RV{}, RM{},
+          ALU0{}, ALU1{},
         _dst(nullptr), _src(nullptr),
+        _instr(0), _addrm(0), _size(0),
+        _store(0), _post(&CPU::imp),
         _ram(nullptr), _reel(nullptr) {
     }
 
@@ -53,6 +56,44 @@ namespace spider {
 #endif
     }
 
+    // Interaction with Reel //
+
+    CPU::Fn CPU::addrModes[] = {
+        &CPU::imm, &CPU::abs,
+        &CPU::reg, &CPU::ind,
+        &CPU::ptr, &CPU::idx,
+        &CPU::sca, &CPU::dis
+    };
+
+    void CPU::fetchInstr() {
+        u16 i = _reel->readU16(RI);
+        _instr = (i >> 7) & 0x1FF;
+        _addrm = (i >> 2) & 0x1F;
+        _size = i & 0x3;
+        RI += 2;
+    }
+
+    void CPU::fetchOperDst() {
+        // Move the operand ptrs
+        _alu = &ALU0;
+        _opers[1] = _opers[0];
+
+        // call specific addressing mode
+        (this->*(CPU::addrModes[_addrm & 0x7]))();
+    }
+
+    void CPU::fetchOperSrc() {
+        // set ALU
+        _alu = &ALU1;
+
+        // call specific addressing mode
+        (this->*(CPU::addrModes[_addrm & 0x7]))();
+
+        // modify the _addrm register
+        _addrm >>= 3;
+        _addrm++;
+    }
+
     // Addressing Modes //
 
     /**
@@ -66,13 +107,67 @@ namespace spider {
      * Immediate Addressing Mode
      */
     void CPU::imm() {
+        switch(_size) {
+            case 0b00:
+                _alu->_u8 = _reel->readU8(RI);
+                break;
+            case 0b01:
+                _alu->_u16 = _reel->readU16(RI);
+                break;
+            case 0b10:
+                _alu->_u32 = _reel->readU32(RI);
+                break;
+            case 0b11:
+                _alu->_u64 = _reel->readU64(RI);
+                break;
+        }
+
+        _opers[0] = _alu;
+        _post = &CPU::imp;
+        RI += 1 << _size;
     }
 
     /**
      * Absolute Addressing Mode
      */
-    void CPU::abs() {
-        u8 size = 2 << getFlag(CPU::FLAG_MEMORY_MODE);
+    void CPU::abs() { // TODO cache ptr size
+        u8 dat_size = 1 << _size;
+        u8 ptr_size = 1 << getFlag(CPU::FLAG_MEMORY_MODE);
+        u64 ptr = 0;
+
+        if(ptr_size + dat_size > _ram->size()) return; // TODO: avoid overflow
+
+        switch(ptr_size) {
+            case 1:
+                ptr = _reel->readU8(RI);
+                break;
+            case 2:
+                ptr = _reel->readU16(RI);
+                break;
+            case 4:
+                ptr = _reel->readU32(RI);
+                break;
+            case 8:
+                ptr = _reel->readU64(RI);
+                break;
+        }
+        
+        switch(_size) {
+            case 0b00:
+                spider::loadLE(&_alu->_u8, &(*_ram)[ptr]);
+                break;
+            case 0b01:
+                spider::loadLE(&_alu->_u16, &(*_ram)[ptr]);
+                break;
+            case 0b10:
+                spider::loadLE(&_alu->_u32, &(*_ram)[ptr]);
+                break;
+            case 0b11:
+                spider::loadLE(&_alu->_u64, &(*_ram)[ptr]);
+                break;
+        }
+
+        RI += dat_size;
     }
 
     /**
@@ -107,4 +202,9 @@ namespace spider {
      */
     void CPU::dis() {}
 
+    /**
+     * Post Write Action
+     */
+    void CPU::psw() {}
+
 }
diff --git a/src/spider/runtime/cpu/CPU.hpp b/src/spider/runtime/cpu/CPU.hpp
index fba9c8e..afc8984 100644
--- a/src/spider/runtime/cpu/CPU.hpp
+++ b/src/spider/runtime/cpu/CPU.hpp
@@ -6,6 +6,9 @@
 namespace spider {
 
     class CPU {
+    public: // Helper types
+        using Fn = void (CPU::*)();
+
     public: // Flag Register Constants //
         static constexpr const u64 FLAG_ENABLE            = 0b0000000000000000000000000000000000000000000000000000000000000001;
         static constexpr const u64 FLAG_INTERRUPT_SIGNAL  = 0b0000000000000000000000000000000000000000000000000000000000000010;
@@ -13,6 +16,10 @@ namespace spider {
         static constexpr const u64 FLAG_EXCEPTION         = 0b0000000000000000000000000000000000000000000000000000000000001000;
         static constexpr const u64 FLAG_MEMORY_MODE       = 0b0000000000000000000000000000000000000000000000000000000000110000;
 
+    public: // Map of addressing modes
+
+        static CPU::Fn addrModes[];
+
     public: // General Purpose Registers
         union {
             register_t GPR[16];
@@ -42,16 +49,33 @@ namespace spider {
          * This way we don't "write" into constant values, rather
          * we write into a writeable var which is "hidden"
          */
-        register_t ALU0;
+        register_t ALU0, ALU1;
 
         union {
             struct {
                 register_t* _dst;
                 register_t* _src;
+                register_t* _alu;
             };
             register_t* _opers[2];
         };
-        
+
+        // Holds the current instruction opcode
+        u16 _instr : 9;
+
+        // Holds the current addressing modes,
+        // before they were used
+        u8 _addrm : 5;
+
+        // Holds the current instruction size.
+        u8 _size : 2;
+
+        // On _post that are not no-ops, it must
+        // write back DST to this memory location.
+        u64 _store;
+
+        // Post execution callback
+        CPU::Fn _post;
 
     private:
 
@@ -99,13 +123,52 @@ namespace spider {
         void hookInstrReel(InstrReel* reel);
 
         constexpr u64 getFlag(u64 mask);
+    
+    public:
+
+        /**
+         * Fetches the instruction from the
+         * reel, and advances IR by two.
+         */
+        void fetchInstr();
+
+        /**
+         * Fetches the destination operand,
+         * by calling the appropriate addressing
+         * mode.
+         * 
+         * Will read the bottom 3 bits.
+         * For instructions with two operands,
+         * call Src first.
+         * 
+         * The internal variable _addrm
+         * will not be modified. It will
+         * be important when writing
+         * back the result.
+         */
+        void fetchOperDst();
+
+        /**
+         * Fetches the source operand.
+         * 
+         * For use in two operand instructions.
+         * 
+         * Will read the bottom 3 bits. It will
+         * then shift the _addrm 3 spaces
+         * to ensure it aligns with the DST
+         * next.
+         * 
+         * Additionally, it will add 1 to _addrm
+         * to account with
+         */
+        void fetchOperSrc();
 
     public: // Addressing Modes
 
         /**
          * Implied Addressing Mode
          */
-        void imp();
+        void imp(); // Kept as it is a no-op
 
         /**
          * Immediate Addressing Mode
@@ -147,6 +210,11 @@ namespace spider {
          */
         void dis();
 
+        /**
+         * Post-Write Action
+         */
+        void psw();
+
     public:
 
         // <pygen-target name=cpu-instructions> //
diff --git a/src/spider/runtime/debug/LiveDebug.cpp b/src/spider/runtime/debug/LiveDebug.cpp
index cfe94a4..8e80d5c 100644
--- a/src/spider/runtime/debug/LiveDebug.cpp
+++ b/src/spider/runtime/debug/LiveDebug.cpp
@@ -1,5 +1,7 @@
 #include "LiveDebug.hpp"
 
+#include <spider/runtime/reel/InstrReelFixed.hpp>
+
 #include <spider/runtime/Runtime.hpp>
 #include <spider/runtime/util/Terminal.hpp>
 #include <spider/runtime/native/distro.hpp>
@@ -122,7 +124,7 @@ namespace spider {
             &cpu.R6, &cpu.R7, &cpu.R8, &cpu.R9,
             //&cpu.RF, &cpu.RI, &cpu.RS, &cpu.RZ,
             //&cpu.RE, &cpu.RN, &cpu.RV, &cpu.RM,
-            &cpu.ALU0, &cpu.ALU0
+            &cpu.ALU0, &cpu.ALU1
         };
         const u64* sys_regs[] = {
             &cpu.RF, &cpu.RI, &cpu.RS, &cpu.RZ,
@@ -148,12 +150,12 @@ namespace spider {
 
         t.move(r += 16, c);
         r++;
-        for (i32 j = 0, i = 8; i < 12; j++, i++) {
+        for (i32 j = 0; j < 4; j++) {
             t.style(alt[j & 1]);
             t.move(r + j * 2, c);
-            printU64Hex(*sys_regs[i * 2]);
+            printU64Hex(*sys_regs[j * 2]);
             t.move(r + j * 2, c + 17);
-            printU64Hex(*sys_regs[i * 2 + 1]);
+            printU64Hex(*sys_regs[j * 2 + 1]);
         }
 
         t.move(r += 8, c);
@@ -328,6 +330,17 @@ namespace spider {
     int liveDebugMain() {
         Terminal t;
         Runtime runtime(1024);
+        InstrReelFixed fix(100);
+        runtime.ram[0] = 0xFF;
+        runtime.ram[1] = 0xEE;
+        runtime.ram[2] = 0xDD;
+        runtime.ram[3] = 0xCC;
+        runtime.ram[4] = 0xBB;
+        runtime.ram[5] = 0xAA;
+        runtime.ram[6] = 0x99;
+        runtime.ram[7] = 0x88;
+        fix.writeU16(0, 0b0000111);
+        runtime.hookReel(&fix, false);
 
         bool running = true, update = true;
         u64 ramScroll = 0;
@@ -372,6 +385,11 @@ namespace spider {
                 if (runtime.ram.size() >= 16 && ramScroll <= runtime.ram.size() - 16) ramScroll += 16;
                 update = true;
                 break;
+            case Terminal::ENTER:
+                update = true;
+                runtime.cpu.fetchInstr();
+                runtime.cpu.fetchOperDst();
+                break;
             default:
                 break;
             }