CompuServe Messages

The bus probably needs to be terminated. Does the Sidecar have a pc-board connector at the end of the bus traces? If so, and there is nothing plugged into it, you could kludge up a pc-board to provide the termination. Larry, what did Brad Fowles say worked? There were twenty lines that required termination for the LUCAS board to work properly with some other SOTS add-ons. The 16 data lines and four control lines. I can't remember the values off the top of my head, but I have them at work. It involves a capacitor from the line to the +5V supply, and a capacitor in series with a resistor from the line to ground. I saw the very first prototype of the PAL expansion chassis that Brad Carvey built for Byte-by-Byte. He said the bus termination was the trickiest part of the design (which worked quite well, by the way. It just cost too much). The other thing you might try is the PAL grounding trick that Amazing Computing published last year. Don't follow the directions in the original article, though. Get the following issue, which published a corrected diagram.