Okay, I just read the disclaimer, and I’m not looking for anyone to design one for me, I am kind of hoping someone knows of someplace I can get one that already exists. The 56 pin STD bus architecture is a bit long in the tooth, and I haven’t come across on, but then, if you don’t stick the right words in the right order, internet searches can be… Michelle
I quite enjoy designing footprints and symbols, so if you don’t happen to find it anywhere else then I could likely help.
That said, and I think, learning how to do these two things is one of the most important skills you can have in PCB design, because once you know how to design your own parts then there is literally nothing you can’t build.
And all of the that said, maybe take a look at GitHub - BitsOfTheGoldenAge/SDK-85: Project files related to SDK-85+ System
Craig has a YouTube channel and has talked a lot about STD bus, so he might have a footprint all made up for his projects.
Well, I had been looking for another KiCAD project that I could utilize by stripping out all but the board outline and the bus edge connector stuff, but my usual haunts came up empty. I think I have the outline; at least a dimensioned contiguous polyline to the correct dimensions in the PCB Editor. I can do the schematic part in the Sch Ed. I think my hurdle will be creating the footprint, with the correct size fingers and numbered correctly on the edge of the card. Oh well, I’m still getting my toes wet on this. Yep, I have a lot of YouTube stuff to look at as well. Thanks…
Googling for “STD bus specification” turned up this for me: https://resources.winsystems.com/specs/std_section1.pdf
It looks to have a lot of useful information like pin descriptions, electrical specs, and also mechanical specs.
I just downloaded some files from the link I provided earlier and realised they are only gerbers, which isnt that useful in this case. I was on my tablet earlier so wasnt able to see inside the zip files, but I was hoping they might have contained KiCad project files.
You could always try emailing Craig and see if he will send you a stripped down KiCad board file.
A bit weird. The pictures on the last two pages of the document tomstorey found count 26 contact fingers, that would suggest a 52 pin bus, but the table does show indeed 56 signals.
You still got a bit of a learning curve ahead of you. Designing symbols and footprints is pretty quick. The most complicated part is finding the actual information you want in your symbol or footprint.
Below a screenshot of the schematic for a backplane project I designed. It has one custom symbol (J1 on the left), and for the others I used standard library footprints. This symbol is also going to be used for the daughter cards, and therefore helps with keeping the signal names correct. (Also, check out how the “pin Helpers” work (New in KiCad V8)).
I have also sorted the wire labels in 4 columns, according to their function. This was quite handy, because signal order changed a few times during this project.
The thicker wires are created automagically by setting the netclass for power nets.
For the footprints, you will need two of them. (Male and Female). The male is probably some standard connector (or use the footprint wizard for S-DIP, and modify the result a bit) , for the female, you can use two arrays of SMT pads.
I got bored, and was sufficiently interested, so I made a board template with card edge footprint anyway. 
Feel free to use it if you like.
I have mild concerns about whether the polarity key notch can be routed by some PCB manufacturers because it is sub 2mm in width, but ideally they will pick up on that during review and will flag it if it is an issue.
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