debs3759 wrote on 2022-03-31, 20:03:

Kahenraz wrote on 2022-03-31, 18:07:

Sphere478 wrote on 2022-03-31, 17:31:

probably four for structural, and just a pair for each of whatever functions you want to use. solder rest later. pads are provided for all possible holes, but not all need be soldered.

I think he misunderstood and thought that all pins will need to be soldered. Only the pins that we need will have to be soldered, and as you said, maybe a few others for some stability. This can be done easily in under 10 minutes.

"He" is a she 😀

You're right though, I imagined it to need a lot more work than Sphere indicated above.

Damn previous generations and their use use of generalized masculane pronouns. I do my best, but every once in a while a they comes out as a he also.

Anyway, I may be able to add markings next to the pins required for each mod. Thanks for bringing this up.

Maybe put a * next to vcc detect, a % next to bf2, a # next to bf1 etc.

These are the minimum to make structure and all switch mods work.

(Circles will be on pcb from here on out)

Edit: added labels to holes.

I assume that all of the vias with the white circles are for soldering. Are all of the other ones that are just plated meant for mechanical strength and otherwise optional?

Kahenraz wrote on 2022-03-31, 21:23:

I assume that all of the vias with the white circles are for soldering. Are all of the other ones that are just plated meant for mechanical strength and otherwise optional?

circled ones are minimum that must be connected for switches to function and minimum mechanical secureness.
but all plated holes have electrical significance. it's alright to just do the minimum if you don't plan to tap power at edges though.

did some more work:

v3.14159

I'm trying to figure out how to ground the flood planes..?

I mean I can drag a trace into them but that doesn't seem right... I'm actually really happy with it it in its current form now remaining things I may or may not do seem kinda minor

I had a thought to try and add a fourth dip switch to the tillamook block in case another mod comes up in the future it could be wired via boge wire but with the silk text there isn't much room without deleting some info. and it kinda seems like we addressed everything...?

v3.141592
okay, I think this is the final revision sparing a error being discovered, I'm done!
I talked with jlpcb about the previous version and they said all was well except something about multiple drill layers but they said it wasn't a problem it would still work

included gerbers in above attachment

-tweaked traces some more
-buried vias
-linked floods to vss ground (I cheated by overlapping stuff onto it to get it done 🤣
-removed kapton tape on tweaker requirement due to now buried vias
-updated version number

Who will be the first to try it? 😀

I have only one SS7 board, so it will have to be someone else.

Kahenraz wrote on 2022-04-01, 17:18:

Who will be the first to try it? 😀

I have only one SS7 board, so it will have to be someone else.

I just ordered some 🙃

I chose the slow shipping option so it’ll be a while before I see them.

Btw, I also ordered thin pcb option. Remember, space is at a premium back there under the motherboard.

Can you provide dimensions and a picture for the appropriate toggle switches?

Kahenraz wrote on 2022-04-01, 17:52:

Can you provide dimensions and a picture for the appropriate toggle switches?

See the two folders in the zip file. They are the footprints and model numbers for the dip switches

Awesome. This is an amazing project. Thank you so much for sharing. 😀

Kahenraz wrote on 2022-04-01, 18:27:

Awesome. This is an amazing project. Thank you so much for sharing. 😀

Thanks :p

it'll take some time to get these pcbs in the mail,
in the meanwhile I've begun phase 2:
Socket 5/7/SS7 (Voltage Interposer) Tweaker. (Released)

—————————————————————————————

Earlier in the thread I had wondered about the possible need to recess the dip for more clearance.
If you order the thinnest pcb it looks like there will barely just be enough room 😀

Love you revision numbers 😀

My math thesis at uni was on the history of pi 😀

debs3759 wrote on 2022-04-03, 00:06:

Love you revision numbers 😀

My math thesis at uni was on the history of pi 😀

I was waiting for someone to notice the mark of Sphere.

-

Added notes to OP for resistor values

Resistor values:

-WB/WT
observed to work in WB with 1k pull up on asus p5a 1.05, 1.06. (pull down not testable on p5a 1.05, 1.06 as board defaults to this value anyway.)
behavior unknown on other boards

-BF0,1,2,Tillamook BF2. (pull up)
intel specs pull up at 2.2k(or less),
2.2k observed in action on tyan s1564,
kingston interposer observed in action at 330-ohm,
330-ohm observed working in tillamook l2 cache thread
personal note: higher the better, try 2200-ohm first

-BF0,1,2,Tillamook BF2. (pull down)
intel specs pull down at 500-ohms(or less)
kingston interposer observed in action at 25-ohm,
personal note: higher the better try 100-500 ohm first

-vccdet:
0-ohm shown working in tillamook l2 thread (requesting testing to find a higher working safer value)

-BRDY(c):
0-ohm shown working in tillamook l2 thread (requesting testing to find a higher working safer value)

- ADS(c):
0-ohm shown working in tillamook l2 thread (requesting testing to find a higher working safer value)

I read that this could be used as a source for 3.3V on the PCI slots that don't have it. Can a small voltage regulator be added to obtain -5V for the ISA slots as well? This would allow the modification of boards to add this voltage without the need for an older power supply or a Voltage Blaster taking up a slot.

Kahenraz wrote on 2022-04-10, 06:00:

I read that this could be used as a source for 3.3V on the PCI slots that don't have it. Can a small voltage regulator be added to obtain -5V for the ISA slots as well? This would allow the modification of boards to add this voltage without the need for an older power supply or a Voltage Blaster taking up a slot.

There is a device for that called voltage blaster. Check it out.

Check out the last sentence of that quote. 😀

Kahenraz wrote on 2022-04-10, 21:10:

Check out the last sentence of that quote. 😀

Oh sorry, no I wouldn’t recommend trying to make -5v with anything that is on the cpu socket.

As for using it for pci 3.3v, Others have cautioned about using I/O for pci. So far as I know no one has tried it though, but there are those who think it’s a horrible idea.

It is possible to design a board for the back of a isa slot though that makes -5v just like a voltage blaster.

sneak peak at next version

-This one will connect the pads with mostly solid fills I still have to tweak the boundaries. (they are a mess at the moment.) I removed many of the traces and it takes a while to rebuild it as floods.

- I'm trying to put as much VSS between the pins as I can to absorb EMI and keep the VCC2/3 on the top planes to keep their signals as far from the data signals as possible

I still have the last version on order. hasn't arrived yet. don't expect any issues with it. Just figured out a better way to make the pcb.

That's very cool. There's so much that's involved in good PCB engineering. I never would have thought about any of that.

yeah, It's kinda fun

made some more progress, gotta double check everything, new upload soon. expecting a few more revisions though. so stay tuned. this was a major rework. gotta work out the bugs again.