In SX Microcontrollers, SX/B Compiler and SX-Key Tool, lajko wrote:

OK. Thanks for checking on this. Since I have boards to assemble and program for 14 more lanes at West Seattle Bowl, I'll do a good analysis then report if I find anything:
1. test each H11L1 first
2. Read each SX28 first just to see if there is any residual program in it
3. Use scope and/or logic analyzer to see what the A port is doing in a new board before being programmed and before H11L1's are installed when first powered on
If all looks OK, then I will
1. Install all parts
2. with power off, connect the blitz or key
3. power on
4. program SX28 - watching the A ports on a scope to see if they do anything
5. test and see if any H11L1's got fried (note: nothing is connected to the LED side of the H11L1's until the board gets tested, then the LEDs are driven through +5 and a 470 resistor. In the bowling alley, they get driven by an opto isolator from the camera that reads the pins left standing, still through the 470 resistor)

If any still blow out, then I'll really have to dig deeper.

The good thing is the SX28 is working great. The first couple boards are operating flawlessly in 50 year old pinsetters for weeks with no failure or errors reading the camera data. FYI: These boards replace 50 year old wiring that goes to each respot-cell that picks up the pins to detect if it is a strike. Each cell has wiring and old switches. Disconnecting that ancient wiring and using the data from the scoring system camera to tell the ancient stepper relay control chassis that there is a strike eliminates untold hours of tracking down broken wires, switches, shorts and cracked insulation.

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