Just want to mention there is a good S100 motherboard/PS on eBay right now that somebody here might want, See:- http://www.ebay.com/itm/RARE-DELTA-S-100-CARD-CAGE-POWER-SUPPLY-MOD-1-WITH-MANUAL-NEW-OLD-STOCK-IN-BOX-/141308494959?pt=LH_DefaultDomain_0&hash=item20e6a4846f
John On Saturday, October 19, 2013 5:19:08 AM UTC-7, Ants Pants wrote: > Hi All, > > > for those interested in the 18 Slot Backplane discussed in the "S100 > Backplane" thread, please find the attached link below to a .pdf with a > schematic and some board prints, im sorry some of the prints arnt of good > quality, i had to export as SVG and get to a pdf from there, because kicad > wasnt printing the proper track widths, a new problem with the updated > software or just user error??.. so the Top Silk Screen image is a little > "less sharp", but it will give you the general idea. please note that the > board uses the same Active Termination as found on the Compupro Active > Terminator and Godbout 10/11/18 slot backplanes. its the same AT used by > John Monahan on the S100 board available here. those schematics and > documentation along with the original spec sheets from Compupro and Godbout > was used as reference to the creation of this board, so full credit to John > & Andrew for the running start! > > > > for those who arnt up to speed on this board, the backplane itself (no > atx board attached) is a separate board from the ATX board. the kit is 2 > (two) boards. one 18-slot backplane board and one ATX PSU board. the > backplane board is a "normal" 18-slot active terminated S-100 bus board. > The backplane will wire straight up to your +16, -16, +8 and GND power > inputs of your S-100 compliant power supply and work as a normal S100 > backplane would, you can use it without the ATX board. For all intents and > purposes you can throw the ATX board at the cat and forget about it. the > backplane board is very similar in design to any other active terminated > S-100 bus board. the ATX PSU board however is a separate board that has a > 24 pin ATX connector on it (accepting the 20 or 24 pin ATX plug) it has a > terminal block output that you 'could' wire up to the input of your S-100 > board backplane IF you 1. did not have the need for exactly +16 -16 and > +8V. 2. wanted to wire up +5 onto your +8v rail if you ran cards without > onboard voltage regulators, 3. could wire up the +12,V -12V, +12V to the > "+16, -16, +8v".. please note on this wiring up +12V to the +8V rail is > not recommended as your voltage regulators will run hot (it would be best > to take the +12v and put it into a high current DC-DC converter to give you > +8v). you have the ability to choose what you put on your power rails. It > also works prity nice to use your salvaged ATX supply for a lab PSU. the > ATX PSU (we could call it a sub-card) has: +12v, +5v, +3.3v, GND & -12v > output on its terminal block. > > > > The ATX board uses a small PIC microcontroller to act as the "debounce" > switch (on/off) as its about expensive as the amount of 7400 series devices > i would have used to put on the board to do the same job. i realize this > may cause some "Ahhhhh Errrrrr" for some users.. but the source code or > .HEX file, and programmed devices can be supplied if needed. > > > > a point of discussion is the thickness of the board, i realize the current > N8VEM 8 slot board uses 3.2mm thickness to make the board very rigid, my > biggest concern about this is the ability of the user to use standard S100 > connectors that have about a 3mm lead coming out the bottom after the > plastic standoff. i would like users to be able to utilize the S100 > connectors that some may have been collecting for the last few months. i > have added extra mounting holes along the board so there is a mounting hole > on either side of every two connectors. currently the PCB house i have sent > the design (and use regularly) said 2.0mm was available but not 2.4mm or > 3.2mm. current pricing for a 2.0mm board is approximately $31ea for a 10pcs > run. i doubt i would like to try and make the board any smaller at this > point. but an idea is always to pull off the ATXPSU board and have that > manufactured separately if there is not a big demand for it. > > > > i will be taking pre-orders of an initial batch of boards with a Red > soldermask once the design has been completed and vetted by the "test > group". (or Andrew might like to run it though his Mnufacturer?) this > thread is a show of interest and discussion on possible errors and general > development. Questions and Comments WELCOME! :-) > > > > > > http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder¶m=18%20Slot%20S100%20Backplane > > > > > Kind Regards, > > Antony > -- 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.
