code: function settable (a, b, c) {
  		a = this._register.getItem(a);
  		b = (b >= 256)? this.getConstant(b - 256) : this._register.getItem(b);
  		c = (c >= 256)? this.getConstant(c - 256) : this._register.getItem(c);
  
  		settable_internal.call(this, a, b, c);
  	}
docs: *************************************************************** settable