I like the switch idea.  But for quick and dirty, I've been doing it for
prototypes for years without a switch (fifth wire to Vdd) where there's not
much current use on the target board.  And if there's really not much
current use at all, and those pins drive high-impedance loads, no resistors
either.  My PSP has never complained.  Also doing without a header on the
target by using a probe clamp for access to the pins (when DIP chip).

Bruce Cannon
Style Management Systems
http://siliconcrucible.com
(510) 787-6870
1228 Ceres ST Crockett CA 94525

Remember: electronics is changing your world...for good!

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics