Electrical Connections on a Tile
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The diagram below shows electrical connections on a tile. Again, if you are making your own board or using a prototype board you can connect Tibbits in any way you like (as long as it doesn't cause them to smoke and burn). The diagram illustrates our own structured approach to building things with Tibbits.
GND, +5V, +15V, and -15V rails were already explained in Tibbit Power Lines.
Eight control lines of the tile -- four per "M" socket -- go to the TPP's CPU.
"C" sockets and "M" sockets are interconnected directly (see eight short black lines).
A word on the naming of control lines. "M" sockets (these are (S5) and (S7) on the diagram above) have control lines A, B, C, and D. M1 Tibbits have a matching set of control lines A-D. M2 Tibbits have eight control lines A-H. When you plug an M2 device into the tile, its control lines correspond to the control lines of the tile as follows:
* (S5) on the diagram
** (S7) on the diagram