Since Aidan’s main computer is my old Del Lattitude running XP I realized that I should build a programmer for his system as it has a serial port. Basically its a max232 in a translucent plastic box with a buffer to drive some blinking lights so you know things are transmitting and recieving. Like my usb based programmer it has a cap on the DTR line to reset the board. The biggest problem I had building this was fining a db9 cable where pin4 was actually wired. The one I found was a bit bulky. The leds are “amplified” using a couple of chunks of plastic tubing.
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