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Cool, and if you are sitting on a bunch of 10 pin r-nets, you can always clip off the last pin... Not a very elegant solution, but it works fine every time I've done so.
> Date: Sun, 3 May 2015 02:14:20 -0700 > From: radi...@gmail.com > To: n8vem...@googlegroups.com > Subject: Re: [N8VEM-S100:6918] Re: Reorder of S-100 8-slot Backplane PCB > > In stock at Digikey. > > <http://www.digikey.com/product-search/en?pv69=80&FV=fff40001%2Cfff80007%2C28000f&k=resistor+network&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=50> > > On 5/2/2015 10:58 PM, Tom Lafleur wrote: > > Yes they do make 9 pin r-nets, but the might be hard to find as a common > > stock part... > > > > http://www.bourns.com/pdfs/4600x.pdf > > > > > > i~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~i > > > > Tom Lafleur > > > > > > On May 2, 2015, at 7:06 PM, Bob Bell <bb...@gmail.com > > <mailto:bbel...@gmail.com>> wrote: > > > > 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:*n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > [mailto:n8vem...@googlegroups.com] *On Behalf Of *Crusty OMO > > *Sent:* Saturday, May 02, 2015 9:50 PM > > *To:* n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > *Subject:* RE: [N8VEM-S100:6914] Re: Reorder of S-100 8-slot Backplane PCB > > > > PDF's attached for V4 > > > > > > ------------------------------------------------------------------------ > > > > From: bbel...@gmail.com <mailto:bbel...@gmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > 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:*n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > [mailto:n8vem...@googlegroups.com] *On Behalf Of *Crusty OMO > > *Sent:* Friday, May 01, 2015 8:08 PM > > *To:* n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > *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: bbel...@gmail.com <mailto:bbel...@gmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > 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:*n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > [mailto:n8vem...@googlegroups.com] *On Behalf Of *Crusty OMO > > *Sent:* Friday, May 01, 2015 12:19 PM > > *To:* n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > *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: bbel...@gmail.com <mailto:bbel...@gmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > 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:*n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > [mailto:n8vem...@googlegroups.com] *On Behalf Of *Crusty OMO > > *Sent:* Wednesday, April 29, 2015 10:50 PM > > *To:* n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > *Subject:* RE: [N8VEM-S100:6877] Re: Reorder of S-100 8-slot Backplane PCB > > > > > > I click the link and it works for me. > > > > Josh. > > > > ------------------------------------------------------------------------ > > > > From: bbel...@gmail.com <mailto:bbel...@gmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > Subject: RE: [N8VEM-S100:6876] Re: Reorder of S-100 8-slot Backplane PCB > > Date: Wed, 29 Apr 2015 21:13:09 -0400 > > > > I was going to review the work, but the link takes me to a blank page > > that says: > > ViewFolder failed to load: Folder 'S-100 backplane' does not exist. > > > > Has anyone else had the same issue? > > > > Bob Bell > > > > *From:*n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > [mailto:n8vem...@googlegroups.com] *On Behalf Of *Todd Goodman > > *Sent:* Wednesday, April 29, 2015 8:14 AM > > *To:* n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > *Subject:* Re: [N8VEM-S100:6864] Re: Reorder of S-100 8-slot Backplane PCB > > > > Thanks Josh! > > > > If others (Don, Bob, and anyone else) who had changes they wanted to > > make can take a look I'd appreciate it. > > > > Thanks! > > > > Todd > > > > On Tue, Apr 28, 2015 at 10:05 PM, Crusty OMO <cru...@hotmail.com > > <mailto:crus...@hotmail.com>> wrote: > > > > Hi Todd, > > > > Ok, I took a good look over the board, found 1 minor mistake. I added > > some text to the silk screen layer to make it friendly. > > > > I'm pretty much done, I can't see anything more to add or fix. I > > counted the S-100 pins a few times, came up with 98 on one count, but > > that's ok, we can just file off 1 of the pins and call it S-98. > > > > Anyway, the new V4 files are on line at: > > http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder¶m=S-100%20backplane > > Look for file S100 backplane V4.zip > > > > If anyone wants to review them, please do. Otherwise... I think I'm done. > > > > Cheers, > > Josh Bensadon > > > > ------------------------------------------------------------------------ > > > > Date: Mon, 27 Apr 2015 08:38:42 -0400 > > Subject: Re: [N8VEM-S100:6831] Re: Reorder of S-100 8-slot Backplane PCB > > > > > > From: tacom...@gmail.com <mailto:tacom...@gmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > > > Hi Josh, > > > > Looks great to me! (I didn't look at the beta version yet though.) > > > > I won't order until you give the "all clear" and I'm not in a hurry. > > > > Thanks! > > > > Todd > > > > On Mon, Apr 27, 2015 at 12:19 AM, Crusty OMO <cru...@hotmail.com > > <mailto:crus...@hotmail.com>> wrote: > > > > Hi Todd, > > > > Ok, I've finished rewiring the S-100 9-slot backplane. Please do not > > build it yet... I want to look it over a few times, since it's all hand > > routed, there might be problems. I also want to pretty up the Silk Screen. > > > > I've uploaded this beta version for anyone to help look for problems. > > It's at: > > http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder¶m=S-100%20backplane > > > > The file is called "S-100 Backplane v4-beta.zip" > > > > Features of the board: > > -Includes a custom spaced slot #1 for Front Panel on the IMSAI computer > > (spacing = 1.04" instead of .75") > > -Holes for mounting in either ALTAIR or IMSAI chassis > > -There is a "no component" or Trace zone where the board would rest on > > the rails of an ALTAIR computer. > > -Bus traces are all on the bottom, top layer is primarily a fill zone to > > help shield bus noise. > > -2 connectors for power are available, the original 0.2" spaced and a > > new 0.156" spaced for molex connectors. > > -9 Slots in total. > > -Board can be extended to another back plane by use of 3 x 34 pin ribbon > > cables > > -The last board can be terminated. > > -Reset switch moved to the front > > -Grounding jumpers for 3 bus lines (as per previous versions) > > > > Note, Termination uses the same holes that the ribbon cable would, so > > it's either, extend the bus, or terminate the bus, but not both. > > > > <image001.gif> > > > > > > > > Losses on the board.... > > -No fuses, I just couldn't squeeze them in... I hope this is ok.... > > > > Regards, > > Josh Bensadon > > > > ------------------------------------------------------------------------ > > > > From: crus...@hotmail.com <mailto:crus...@hotmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > Subject: RE: [N8VEM-S100:6827] Re: Reorder of S-100 8-slot Backplane PCB > > Date: Sun, 26 Apr 2015 15:22:38 -0400 > > > > Hi Todd, > > > > I'm well underway on rewiring the back plane. Since it's not a > > complicated circuit, I am foregoing the schematic and just doing the > > traces in manual mode. The first slot is spaced 1" from the 2nd slot. > > Since I want to be able to cascade them, and since the IMSAI board is > > wider, I moved the Termination to the side and was able to add a 9th > > slot. The back 8 slots are all 3/4" spaced. When you cascade the > > boards, the last slot will be 2.25" from the 2nd slot on the next board, > > ie, skip 2 standard slots and resume 3/4" spacing. > > > > The mounting holes for IMSAI are there, and even when cascaded, they > > *should* all line up... I hope. > > > > The mounting holes for ALTAIR are just the holes for the S100 > > connectors, but I was careful to not place components or traces along > > the width of the two rails. The first slot spaced 1" can be mounted > > into the existing holes, but new holes will need to be drilled and > > tapped for the last slot. I haven't removed my ALTAIR Back Plane to > > look (don't want to upset all the wires, I heard on another post that > > these wires break easily). But it appears they only drilled and tapped > > 4 holes on the rails anyway. > > > > I hope to get this board done by tonight... but I recommend you give me > > another week to look it over for errors. > > > > Cheers, > > Josh > > > > ------------------------------------------------------------------------ > > > > Date: Sat, 25 Apr 2015 16:03:29 -0400 > > Subject: Re: [N8VEM-S100:6825] Re: Reorder of S-100 8-slot Backplane PCB > > From: tacom...@gmail.com <mailto:tacom...@gmail.com> > > To: n8vem...@googlegroups.com <mailto:n8vem...@googlegroups.com> > > > > Hi Josh, > > > > Personally I'd prefer your #2, 8.5" with IMSAI and Altair holes. > > > > It looks like fabricating the ALTAIR card guide mounts wouldn't be too bad? > > > > I'm probably not understanding something but couldn't we fix issue with > > cascading the boards when the first slot is shifted buy ensuring there's > > enough bare (or with only lower profile parts than the connectors) after > > the last connector before the edge of the board? Or does that screw up > > card guides or something on some standard chassis? > > > > Todd > > > > On Sat, Apr 25, 2015 at 1:37 PM, Crusty OMO <cru...@hotmail.com > > <mailto:crus...@hotmail.com>> wrote: > > > > Guys, > > > > Here's our first hurdle.... the ALTAIR back plane is 11" wide. It is > > like this because the card slot guides are screwed in from the bottom of > > the board. The IMSAI back plane is only 8.5" wide. > > The 8 slot board v2 is 7.25" wide. > > > > It's not a problem to expand to 8.5", but 11" makes it interfere with > > the IMSAI chassis by about .25" > > > > Option 1. Make it 11", ready for the ALTAIR... IMSAI use will require > > cutting the board. > > Option 2. Make it 8.5", with IMSAI and ALTAIR holes, ALTAIR use will > > just have to sacrifice the card slot guides. > > Option 3. Make it 10.75" with a 8.5" irregular width for the first > > slot, this will allow it to fit both systems, but only allows a single > > screw to hold the 5/8" wide card slot guide (otherwise needs 2 screws). > > > > > > In Option 2, ALTAIR users can always create their own cross beams using > > 1/2" aluminum angle to support the card slot guides. Here's a picture > > of the first slot as pictured from the back. > > Look closely, you see 2 holes for card slot guides. Now look at the > > rail that supports this board, it starts near the S-100 connector, this > > board is supported by the holes of the S-100 connector to two of these > > rails. New rails can easily be added, see the multiple holes available > > on the end of the chassis? > > > > <image002.png> > > > > > > > > The NEXT hurdle involves the fact that the first slot on the IMSAI is > > spaced just over 1" to slot 2. This is because the first slot is meant > > to reach the front panel. All the other slots are the regular 0.75" > > spacing... This shouldn't be too much trouble, but it becomes trouble > > when wanting to cascade these boards to make larger back planes. There > > will need to be a sacrifice of one or two slots to maintain correct > > spacing. > > > > Thoughts? > > > > Regards, > > Josh > > > > > > -- > > 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 n8vem-s100+...@googlegroups.com > > <mailto:n8vem-s100+...@googlegroups.com>. > > For more options, visit https://groups.google.com/d/optout. > > > > > > -- > > 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 n8vem-s100+...@googlegroups.com > > <mailto:n8vem-s100+...@googlegroups.com>. > > For more options, visit https://groups.google.com/d/optout. > > > > > > -- > > You received this message because you are subscribed to the Google > > Groups "N8VEM-S100" group. > > To unsubscribe from this group and stop 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