I have finally had the chance to rebuild the PowerBook 190cs (thanks to a stash of 5300 parts from David). As such the 190cs has the external monitor adapter (with cable) and the IR circuitry (that don’t come with a 190cs). It was rebuilt to serve as a Newton development machine (although I really need to add ethernet to it). I am installing the Newton connection software and some other goodies as I type this.