Fix register handling

hal/instructions.go

@@ -109,7 +109,7 @@ var InstructionLoad = &Instruction{
 		if len(module.register) <= index {
 			return fmt.Errorf("index %d exceeds register size of %d", index, len(module.IO))
 		}
-		module.accumulator = module.register[index]
+		module.accumulator = module.mmu.Read(Address(operand))
 		return nil
 	},
 }
@@ -129,7 +129,7 @@ var InstructionStore = &Instruction{
 		if len(module.register) <= index {
 			return fmt.Errorf("index %d exceeds register size of %d", index, len(module.IO))
 		}
-		module.register[index] = module.accumulator
+		module.mmu.Write(Address(operand), module.accumulator)
 		return nil
 	},
 }
@@ -209,7 +209,8 @@ func newMathInstruction(name string, operation func(accumulator, register float6
 				return fmt.Errorf("index %d does not exist in register", index)
 			}
 
-			module.accumulator = operation(module.accumulator, module.register[index])
+			param := module.mmu.Read(Address(index))
+			module.accumulator = operation(module.accumulator, param)
 			return nil
 		},
 	}