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Pcbs »
Qbus-porQBUS Backplane Power-On-Reset BoardI have a 4 unattached QBUS backplanes laying around and I started to put random CPU's and cards in them. I modified some stock PC power supplies to generate the required +5V and +12V. But I quickly realized that nothing would boot without something to wiggle the DCOK signal. And, I needed a 60Hz clock. I found a simple PIC circuit created by John Wilson and decided to make a simple 2 layer PCB. I added some LED's and push buttons and them wrote new code to generate reset, halt and the line clock. I made 4 of these, and I need all of them but if there is any interest I could make up another batch. If I make 10x the cost would be about $25 each. One button resets the system. The other drops into the debugger. The led's show power and run state. Simple, but does the job!  This is how it looks when installed:  |
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