diff --git a/hal/module.go b/hal/module.go
index fd01476..e483900 100644
--- a/hal/module.go
+++ b/hal/module.go
@@ -5,17 +5,22 @@ import "fmt"
 type Program []*ProgrammedInstruction
 
 type Module struct {
-	Accumulator    int64
+	Accumulator    float64
 	ProgramStorage Program
-	Register       []int64
+	Register       []float64
 }
 
 func (h *Module) ProgramCounter() int64 {
-	return h.Register[0]
+	return int64(h.Register[0])
+}
+
+func (h *Module) increaseProgramCounter() {
+	h.Register[0]++
 }
 
 func (h *Module) Step() error {
 	instruction := h.ProgramStorage[h.ProgramCounter()]
+	h.increaseProgramCounter()
 	if instruction == nil {
 		return fmt.Errorf("instruction not found for program counter = %d", h.ProgramCounter())
 	}
@@ -28,6 +33,6 @@ func NewHALModule(program Program, registerSize uint64) (*Module, error) {
 	}
 	return &Module{
 		ProgramStorage: program,
-		Register:       make([]int64, registerSize),
+		Register:       make([]float64, registerSize),
 	}, nil
 }