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The OP found a different way to trigger the KVM.
It's sad that all of the leg work I did on the PIC is going to be abandon, but It can't be helped. If he found a reliable way to make the KVM work with just a 5V signal, then that will have to do and the PIC circuit becomes unnecessary. As I said, some day, sooner or later, having PS/2 code will probably come in quite handy for me. So It doesn't bother me that we are changing directions. As long as the OP gets his work finished.
Odd... maybe it's the simulation? Or could be my understanding, has been a while since I used a 555. Well, if you tested it, and it worked with your mods, then go ahead and do it your way. Though I may want to investigate why the system is not acting the way I figure it should. You are using a proper NE555 or compatible IC right? There are actually probably thousands of variations on the original design, you could have a different one. I do believe one of the pins is an inverted input, maybe that's where I went wrong...
IDK, if it works your way then go ahead.
what chip should i get thats reprogrammable ?
is the PIC12F509 reprogrammable ?
... however the small green tube relay doesnt and that has a diode alongside it .
70 rounds a second