Among the first XBUS boards I made a parallel IO board made sense.
But, instead of using a decicated chip for that I went on construction one from scratch.
It's much more fun that way.
This board has also gone through a few iterations before I got it to work properly.
There are a version 5.0 as a CAD file, using 74HC273 instead if 74HC175 but as long as the 4.0 version do its job I'm just going to let it sit there on the harddrive.
XBUS Parallel IO
To join the Homebuilt CPUs ring, drop Warren a line, mentioning your page's URL. He'll then add it to the list.
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Note: The ring is chartered for projects that include a home-built CPU. It can emulate a commercial part, that′s OK.
But actually using that commercial CPU doesn′t rate. Likewise, the project must have been at least partially built: pure paper designs don′t rate either.
It can be built using any technology you like, from relays to FPGAs.