isResolvable() {
        if (this.reset.value == 1) return true;
        if (this.en.value == 0 || (this.en.connections.length && this.en.value == undefined)) return false;
        else if (this.clockInp.value == undefined) return false;
        else if (this.asciiInp.value == undefined) return false;
        return true;
    }
@memberof TTY
if no input or enable key is set to 0 returns false