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There's no provision for a standard external keyboard nor monitor on any of these models. However I believe that someone made an external keyboard that interfaced to the HP100/200LX via the serial port and some driver software. I've never heard of any external monitor device for these machines -- it's hard to imagine how that could be done without a major motherboard modification.
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Dave,
I did a quick Google search and came up with the following links:
HP Journal Keyboard adapted to HP-200LX:
http://www.palmtoppaper.com/store/asp/prodtype.asp?prodtype=38
Newton Keyboard adapted to HP-200LX:
http://www.palmtoppaper.com/ptphtml/36/pt360022.htm
Proposed Keyboard for HP-95LX:
http://www.palmtoppaper.com/ptphtml/13/pt130027.htm
Not sure if any of these are actually still available. You may want to spend some time at www.palmtoppaper.com which has a wealth of info on the HP-95/100/200.
Hope this helps.
Bill
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For DOS sessions, CON: (console device) redirection to COM1: may be something to explore...