I have a "Thinker Toys Universal Interface Board" here, and I've been trying to figure it out. This is an early version of the Morrow Switchboard. It has a copyright date of 1978. The manuals available online are for the more common Morrow Switchboard, Rev 2. Comparing this board to a Switchboard reveals some subtle differences, but by and large, the boards are the same. This older version I have has no solder mask, while the Rev 2 has a blue solder mask. There are minor component placement differences. The most drastic difference seems to be the comparators that read the switches at the top of the board. As found, the board had a LOT of trace cuts and jumps, and some traces just plain peeled off - all around those four LS266's at the upper right, directly under the SW5 and SW6. Attempting to figure out what was done is nearly impossible. The switches themselves are still connected to the 266's with factory traces, at least, most of them - but the rest of the inputs were a mess of wires with bad solder joints. Of course... it doesn't work, and the wiring of the switches doesn't even come close to matching the schematics. Not only that, the factory traces that remain don't match the schematics. I mean, the switches wouldn't even be in the same order. It's a mess. So... does anyone have the schematics for this thing? -Ian