Thats ok Josh. It's not that big of a deal. I have drawings for a case that fit the old backplane. Easy enough to change.
On Wed, May 6, 2015 at 5:32 AM, Crusty OMO <[email protected]> wrote: > Hi Don, > > Oh no... I'm not so sure I kept the original mounting holes... I was > focusing on ALTAIR and IMSAI mounting holes. > > Please give me a chance tonight to check and correct. > > Regards, > Josh > > > ------------------------------ > Date: Tue, 5 May 2015 21:37:51 -0700 > From: [email protected] > To: [email protected] > Subject: Re: [N8VEM-S100:6969] Re: Reorder of S-100 8-slot Backplane PCB > > > Todd, > > I'll take 4 of the backplane boards. > > I'm late to the game but it sounds like you guys have it well in hand. > I'm good with whatever you come up with as long as the mounting holes > are the same. > > > On 04/29/15 05:14 AM, Todd Goodman wrote: > > 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 <[email protected]> > 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: [email protected] > To: [email protected] > > 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 <[email protected]> > 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. > > > > > > Losses on the board.... > -No fuses, I just couldn't squeeze them in... I hope this is ok.... > > Regards, > Josh Bensadon > > > > > > ------------------------------ > From: [email protected] > To: [email protected] > 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: [email protected] > To: [email protected] > > 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 <[email protected]> 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? > > > > > 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 [email protected]. > 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 [email protected]. > 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 [email protected]. > 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 [email protected]. > 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 [email protected]. > 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 [email protected]. > 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > > > -- > Don [email protected] > > > -- > 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. > > -- > 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. > -- ------------------------------- Don Caprio [email protected] http://www.uxpro.com (925) 240-UNIX -- 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.
