Well, if 9 pin r-nets are available or one is comfortable with clipping 10 to make 9, then the design works. It is nice to duel-purpose the connector.
Bob Bell Sent from somewhere in the Galaxy... -------- Original message -------- From: Crusty OMO <[email protected]> Date: 2015/05/03 11:36 AM (GMT-05:00) To: [email protected] Subject: RE: [N8VEM-S100:6920] Re: Reorder of S-100 8-slot Backplane PCB The bus is routed to a 34 pin connector, so I thought it would be nice to repurpose this connector as the termination resistors, which is why I made it 38 pins. Using 9 pin R-Nets, from both sides will reach 32 of the 34 pins. The missing 2 pins are in the center and are wired as either +8V or GND, so they don't need termination. The +16 and -16 are wired to the 34 pin connector and don't need termination either, so be advised that either those traces be cut or the leads of that pin of the RNet be clipped. I'm thinking of just not routing the +16/-16 since these power lines can easily be fed to the 2nd back plane if desired... your thoughts? From: [email protected] To: [email protected] Subject: RE: [N8VEM-S100:6915] Re: Reorder of S-100 8-slot Backplane PCB Date: Sat, 2 May 2015 22:06:01 -0400 I’m curious about the termination R-Nets. I thought they would all be the same, but there are only 38 pins on each of the connectors where the R-Nets will go, so four 10-position (9 resistor) R-Nets won’t fit. They will need a total of 40 pins. And they don’t make 9-position R-Nets from what I can see. Bob Bell From: [email protected] [mailto:[email protected]] On Behalf Of Crusty OMO Sent: Saturday, May 02, 2015 9:50 PM To: [email protected] Subject: RE: [N8VEM-S100:6914] Re: Reorder of S-100 8-slot Backplane PCB PDF's attached for V4 From: [email protected] To: [email protected] Subject: RE: [N8VEM-S100:6907] Re: Reorder of S-100 8-slot Backplane PCB Date: Fri, 1 May 2015 21:26:16 -0400 Ah, so there is both an easier way and a smarter way to do this. Thanks for the advice. It works fine now. Bob Bell From: [email protected] [mailto:[email protected]] On Behalf Of Crusty OMO Sent: Friday, May 01, 2015 8:08 PM To: [email protected] Subject: RE: [N8VEM-S100:6905] Re: Reorder of S-100 8-slot Backplane PCB Bob, It's the dreaded intermittent car noise. Take it into the mechanic and it stops making that noise.... This is why I put a life sized mechanic in the trunk... it works like a scare crow. So, after you open KiCad, and before you click PCBNew, click File Open from the menu to open the whole project (schematic and PCB files). Then PCBNew will find the .brd file from that project folder. Cheers, Josh From: [email protected] To: [email protected] Subject: RE: [N8VEM-S100:6903] Re: Reorder of S-100 8-slot Backplane PCB Date: Fri, 1 May 2015 14:21:35 -0400 Thanks for your help, Josh. Here’s what I have tried: Running KiCAD 2013-07-07 BZR 4022 – stable. >From here, I click on PCBNew and it starts. (It complains about some unknown project – makes no sense – I just click okay.) I click File Open, and I get a dialog saying the current board has been modified, and if I want to discard the changes. I answer Yes. Then I get an Open Board File dialog. In here, I navigate to where I have your files stored. When I get there, it says No items match your search. I know for sure your files are there – I can see them in Windows Explorer. Wait…as I am going through this to reproduce the problem, I now see where I can change the file type. And one of the types is KiCAD .brd. I selected that and now I can open your KiCAD file. I swear that was not there yesterday! No more problems! Bob Bell From: [email protected] [mailto:[email protected]] On Behalf Of Crusty OMO Sent: Friday, May 01, 2015 12:19 PM To: [email protected] Subject: RE: [N8VEM-S100:6902] Re: Reorder of S-100 8-slot Backplane PCB Hmm, I'm not sure why it won't open. Did you open the project from KiCad first? Perhaps we can arrange a phone call and I can walk you through how I did it here? -Josh From: [email protected] To: [email protected] Subject: RE: [N8VEM-S100:6894] Re: Reorder of S-100 8-slot Backplane PCB Date: Thu, 30 Apr 2015 21:46:24 -0400 Okay. I got my account straightened out on PBworks and I can get to the files. But now the next hurdle: I cannot open any of them in KiCAD PCBNew. It wants a file with a kicad_pcb extension, of which there are none. I have done minimal work in PCBNew, so I’m not sure what to expect. Please advise. Bob Bell From: [email protected] [mailto:[email protected]] On Behalf Of Crusty OMO Sent: Wednesday, April 29, 2015 10:50 PM To: [email protected] Subject: RE: [N8VEM-S100:6877] Re: Reorder of S-100 8-slot Backplane PCB -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
