To allow the Oliger NMI functions to work. Larry Kenny suggests the addition of a tiny slide switch to be connected as shown in figure 1 below. UPDATE has added this switch and it works fine. There are two holes to the left of the 74LS74 chip. A resistor is standing at 45 degree angle and in the way. Push the top of the resistor toward the EPROM so that a wire can be soldered to the vacant hole nearest the 74LS74 chip. The slide switch connects between that hole and the ground strap that extends along the right edge of the circuit board. I had trouble getting the tip of the soldering iron in that small space, so I soldered to the underside of the plated through hole. Before soldering the wire, the paint was scraped off of the hole with a exacto knife. The switch was fastened to the circuit board with epoxi glue “after the electrical connections were made. Be careful not to short out the pins of the 74LS74. I prefer the switch be mounted as shown because it does not cover up any circuit traces, but since circuit board lay outs may be slightly different an alternative place for the switch is shown. This would be behind the 74LS74 and between it and the next IC. You should be able to find a tiny micro switch at Radio Shack. The smaller the better. If you find a micro switch small enough it can be stuck on so that it does not extend beyond the edge of the circuit board, thus allowing the dock door to close. –BJ
