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images of the 5161 planar board / backplane?

TRS-Eric

TRS-Eric

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Sep 28, 2021
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Does anyone have images of the 5161 planar board / backplane board? Specifically the rear side of it?

I want to reproduce it. I already have a schematic of it I just want to reproduce one that looks similar. Thanks!
 
I have a couple of versions. Let me know if you need me to zoom in on anything or whatever.

IMG_3611.jpegIMG_3612.jpegIMG_3613.jpegIMG_3614.jpeg
 
These are awesome! Thanks everyone! I'm definitely going to go yellow/brown with my repro :D
Jafir you wouldn't be looking to sell one would you?
 
I’m not looking to sell at the moment. One needs to go in a 5161 case I have. At some point when I figure out what I’m doing I’d consider selling the remaining one.
 
Sounds good. Keep me in mind if you ever consider it!

Here's what I've come up with so far from your images. I was able to figure out how to overlay images in KiCad. Would you be willing to give me a precise width and height of the board? And if you have a calipers, what's the thickness? Just for curiosity. With the width/height I can scale the images properly and go from there. I already have the precise measurements of the actual ISA slots so I'll be able to line those up properly.

PS. I know the ISA slot holes are not the right spacing I will get that fixed! Oh, and I plan to open source this design. Is it ok if I include your images with credit?

Rough WIP X-ray image:
wip-5161.png
 
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Hi all. I'm pretty much done with the above. I no longer need measurements as I have confirmed with my regular motherboard that everything is accurate. The entire board is accurate to within a few millimeters based on the photos. Here's some finished glamor shots!

1692298573270.png

1692298637005.png

1692298705467.png

I've left the holes pretty large on the variable capacitor so that one could use any number of different types without too much headache.

I'll release this all on gitlab as soon as I've tested it.





Before I send off however, I just wanted to confirm with anybody who can answer, is the DB0 line not connected to anything? Pin 40. Pin 9 is connected on the other side, but pin 40 doesn't seem to be connected from either side.

1692296815662.png
 
Sorry I completely forgot about this. I got out my planar to measure it with my super cheap harbor freight calipers and the batteries were no good. So I put it away and forgot to go get batteries.
 
DB0 (data bus bit zero) is required.

It also looks like IO is broken as it passes C9 and C11.

Also the square GNDREF pad of C9 shows as rats nest (unconnected).

Something does not look correct with power connectors P1 and P2. On the PC motherboard the grounds of P1 and P2 are next to each other. In the xray view in post 7 the grounds are on opposite ends. I think they need to be rotated 180 degrees. That is unless something has changed between post 7 and post 8.
 
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all of the db0 seem to be connected to each other on mine, at least according to my multimeter. If that’s what you’re asking.
 
It also looks like IO is broken as it passes C9 and C11.

Also the square GNDREF pad of C9 shows as rats nest (unconnected).

Something does not look correct with power connectors P1 and P2.
Click to expand...
C9 and C11 look good here, must have fixed it on the errors check pass. They're connected on the top side and then the bottom side over to pin 1.

P1 and P2 were probably not in the right orientation at the time of the first pic as that was just a rough layout to get started, they are correct now in the final version.

That's interesting, I wonder where the line is hiding. I'll take another look through all the various images.
Click to expand...
Thanks for checking, I thought maybe db0 was unused but clearly that's not true. I think I see where db0 is run but it'll take over the gnd line, so now I need to figure out how gnd pin 10 is connected. I'm going to study the pictures more.

Jafir could you give me more photos around the third isa slot from the left, there's some traces here I'm not really figuring out. Also if you can test out the ground pins 10 and make sure they are connected, and if you can see how that would be really helpful :D

1692329269838.png
 
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Never-mind all that. I've reasoned about it ceaselessly and figured out all the traces with extreme confidence!

I'll be ordering and building it soon and will report back (verified tolerances are jlcpcb tolerances). I'll also put it on gitlab once I've verified it works!

Here are the files in case anybody wants to build it with me!

Dropbox - File Deleted - Simplify your life

www.dropbox.com www.dropbox.com
 
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