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Flashing lights are good and all, but I was able to put the homebrew computer to good use. I wrote up plans for a Serial Mux and Power Controller on NetAdminTools. Now, I used a Basic Stamp for this, but, really, my homebrew is certainly up to the task. I had to add a PIO to the original homebrew. This PIO is noted in the schematics:
Here is a closeup:
Here is a perl script that downloads the Z-80 machine code program to the homebrew via the printer port: coppwr.txt. Here is the assembly language program for the power console. Here is the listing from a run of asl. For details on these scripts, see this article.
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