Again, I'm really after something that the fellow in a developing nation is likely to be able to afford, rather than what's "nice." An oscilloscope that won't show the delay between rising-edge of ALE and the presence of addresses on P0 isn't of much use even if one isn't really interested in such details. Too slow a 'scope can often lead to erroneous conclusions about what's going on. You should be able to observe the timing of ALE with respect to the oscillator, as a minimum.

For purposes of observing the rise and fall of Vcc, your comment regarding buffer depth is very true. Since there's often quite a large total capacitance between Vcc and Gnd, the decay when power is turned off can be into a significant number of minutes. If one has used the ancient recommendation of a 10uF cap and an 8k2 pulldown on RESET, there's a significant wait involved, too. With a 41 kHz sample rate, that would be a large buffer. It's no secret what happens if you increase the sample rate.

The reason a PC-'scope is desirable is that it's free for hobby and academic use, and everybody seems to have a PC. Once you have to buy something costing more than a decent meal, it becomes burdensome to some.

RE