I had these made for my own use, but this is what I like. The wiring side looks the same, with the exception that there's no gap between the edge and the ground plane. The component side plane is connected to power. The plated-through holes are tailored for 0.025" square pins, commonly used for wire-wrap (which shouldn't surpirse anyone). This makes it easy to use garden-variety ribbon-cable connectors. Unfortunately, as metric -unit parts have gradually replaced imperial unit parts on 0.100" pin-pitch, this sort of board has become less useful. Nevertheless, I have this structure built into all my prototyping boards, whether they're for the PCI or for the S-100, VME, or any other common bus, or for standalone prototyping.

The edge connector on this one is for a backplane that I commonly used in the late '70's.

http://www.8052.com/users/richard/Small%20WWB.JPG

Note, too, that there's a solder mask. My boards have, on both sides, a dry-film solder mask which is brittle and easily chipped off, thereby enabling one to solder directly to the ground or power plane at any point on the board. I then solder a 0805 or 0603 capacitor (10 or maybe 100 nF) directly to the socket pin, and to the appropriate plane, in order to get the best possible supply bypass. Obviously, the component lead lengths are thereby minimized. The fact that it's one contiguous low-impedance plane throughout the board effectively sums all the capacitance, thereby minimizing the need for a swamping cap, the effect of which is to reduce the rise and fall times on Vcc without reducing the effect of the combined capacitance.

Note, too, that there's a mask-free ground strip around the perimeter of the board, which provides a convenient place to attach instrument ground straps. The holes in the ground strip are thermally relieved, which makes it easy to solder and desolder ground pins as they're needed for attaching external references, too.

RE