bakerb

I have a Lorex L14S244C 4-channel observation system (w/B&W monitor). Is there a way to connect a system like this to a DVR card? All of the DVR cards I've seen have seperate camera inputs. The only outputs on the Lorex monitor are standard and Slave outputs for audio and video (which are RCA connections) as well as alarm outputs. The camera's for this system use PS/2 connectors (like computer mice & keyboards) so I can't just plug the individual cameras into a DVR card unless there are some that have PS/2 camera inputs, or if there are PS/2 to BNC converters available? Thanks in advance for any help. Bill