Troubleshooting a 5V Apple III

That depends on the multimeter. Some have capacitance ranges. I wouldn't be suprised if somebody had made a comined multimeter and ESR meter either... But I do question the statement that capacitors are likely to be the problem. I power analuge circuitry (PSUs, CRT monitors, etc) I would agree that electrolytics cna dry up, or short, or.. But in digital circutiry, the only capacitors you are liekly to find are low value ceramic ones (e.g. as a load for a crystal) which are very reliable, and sppply decoupling capacitors. If the latter fail open, then provided only 1 or 2 have gone you won't notice it, and if they fail short than either the cupply rail is pulled right down (easy to spot, although finding which capacitor has shorted is nore 'fun'), or the capacitor gives itself away with smoke signals (tantalum bead capacitors are good at this :-)). -tony