I just completed a local trade with macg4: he got a carload of 680x0's and early PPCs, a couple of monitors and my spare IIe. I got a Mac Plus and a whole lot more free space in my basement. All in all, a pretty fair trade.
One small glitch: macg4 didn't have a spare keyboard or mouse. I found a mouse on eBay, but I have a moral dilemma about paying over $50 for a keyboard. I did a little research, and found that both the 128/512/Plus keyboard and ADB use four pins, and the same voltage.
Pin 1: ground
Pin 2: kbd1
Pin 3: kbd2
Pin 4: +5V DC
Pin 1: ADB
Pin 2: power switch
Pin 3: +5V DC
Pin 4: ground
Detailed pinouts available at http://pinouts.ru: search for "macintosh keyboard"
I also happen to know that an S-video cable is wired identically to an ADB cable, so I won't have to cut a perfectly good ADB cable. I could instead use an ADB Keyboard II or Extended Keyboard II (neither of which has a permanent cable, just 2 ADB jacks), plug an S-video cable into it, lop off the other end of the cable and crimp an RJ13 plug onto it.
Will theis work? Am I at risk of harming my Plus? Or am I a the mercy of the scalliwags at eBay?