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Slot 8 Support Daughterboard for XT-IDE

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    Slot 8 Support Daughterboard for XT-IDE

    As promised:



    This is a little bit of board that will get soldered down to the back of the EEPROM footprint. You'll need to make three wire connections to the XT-IDE. Now, I'm sure we're going to get some posts about how this is a stupid project But, this little board should work with ALL of the existing N8VEM XT-IDE boards, unless you've got one of the XT-IDE rev 1 boards that doesn't have the /CARDSEL edge pin on the connector.

    Ordered boards from OSH Park, 3 boards cost less than $5 shipped. Yes, it's surface mount, but I'll be providing them assembled as well as kit form. Of course, if you want one installed on an XT-IDE board I can do that at assembly time, or you can mail me an existing board and I'll tack it on for you. If you've never tried surface mount soldering, this board should be about as easy as it gets -- 1206 resistors and capacitors, and a 14-pin SOIC chip. Solderable with a 15 Watt Rat Shack iron.

    Once it's verified working, I'll probably order a panelized batch to make my assembly easier. KiCad project files will of course go up on GitHub once it's verified.
    Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

    #2
    That looks awesome. Let us know when you are ready for beta testers. Kits would be great, but I'd be willing to source my own parts if that would make it easier. When you mentioned the tabs to secure it, I assumed they would be just for mechanical attachment but your image looks like they make electrical connections to the eprom. Am I correct?

    Comment


      #3
      Originally posted by ibmapc View Post
      That looks awesome. Let us know when you are ready for beta testers. Kits would be great, but I'd be willing to source my own parts if that would make it easier.
      I'll just plug it into my IBM 5160 PC/XT and see if it works, no need for others to test it when I've still got some of the tin plated XT-IDE rev 3 prototype boards to experiment on It should work fine, it's not that complicated of a thing -- you're just signalling a bus driver on the XT motherboard to turn on. I don't suspect this will be in huge demand, but you're certainly welcome to one of the purple OSH Park prototypes if you'd like!

      Originally posted by ibmapc View Post
      When you mentioned the tabs to secure it, I assumed they would be just for mechanical attachment but your image looks like they make electrical connections to the eprom. Am I correct?
      Yep, that's right! Inspired by some of the console mod chips I've seen I may have the attachment holes v-scored so they can be snapped into a half-pad when removed from the panel. I figure this way there's no gluing and four less jumper wires. Plus for people who don't want to try surface mount at home, I can provide this as an assembled module, and you can still build the rest of the XT-IDE yourself.
      Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

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        #4
        Is there a way to add a jumper to disable it if one wants to take the card out of slot 8 and put it in another slot or a clone? Since the daughter board will be on the solder side, the jumper would need to be bent over so that it would not interfere with other cards. Is that necessary? Or can the "Slot 8 mod" stay active when used in other than 5160 slot 8?

        Comment


          #5
          Originally posted by ibmapc View Post
          Is there a way to add a jumper to disable it if one wants to take the card out of slot 8 and put it in another slot or a clone? Since the daughter board will be on the solder side, the jumper would need to be bent over so that it would not interfere with other cards. Is that necessary? Or can the "Slot 8 mod" stay active when used in other than 5160 slot 8?
          Even better -- I was going to write up the instructions to have users route it through the eigth switch on SW2, it's unused and I left both ends disconnected.
          Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

          Comment


            #6
            Because I apparently can't leave a design alone, I'm working to do the legends as solder mask relief so I can run the board with no silkscreen. One manufacturer I use does excellent photolitho but their silkscreen is awful. If I can use them by getting rid of the silkscreen, I can get the cost per board down around $1. I feel like this should be a $1 board.

            EDIT: Results are now!



            Think I'll order them both ways. The nice thing is, you can export the Gerbers either way, so if people in the future need to run them and do it through e.g. OSH Park, they can just use silkscreen if they like.
            Last edited by glitch; September 14, 2016, 06:21 PM.
            Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

            Comment


              #7
              Will this work on the old XTIDE Rev 2?

              http://www.vcfed.org/forum/showthrea...202-XTIDE-Rev2

              Looks nice!

              Heather

              Comment


                #8
                Originally posted by SkydivinGirl View Post
                Will this work on the old XTIDE Rev 2?

                http://www.vcfed.org/forum/showthrea...202-XTIDE-Rev2

                Looks nice!

                Heather
                As long as it has all of the gold edge fingers -- I don't know if any rev 2 boards were made with the unused fingers removed, like some of the rev 1 boards. I have a few rev 2 boards here, I plan to test on one to get a definite answer and write up instructions. I'll have to look at the schematic, but it may not work with the built-in serial port.

                EDIT: Just looked over the rev 2 schematic, it will be slightly different than installation on a rev 3 or rev 1 card but it should fully work including the built-in serial port!
                Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                Comment


                  #9
                  Added the parts onto today's Mouser order. My prototype quantities are probably sufficient for parts kits! I bought enough for 10 boards.
                  Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                  Comment


                    #10
                    That's fantastic. Let me know how and when to order one.

                    Comment


                      #11
                      If it works with the rev 2 board with the serial port then I'll definitely get one.

                      Thanks!

                      Heather

                      Comment


                        #12
                        Mouser parts arrived today, everything looks correct! I also ordered some parts for measurement confirmation for another sort-of XT-IDE related project

                        OSH Park says they expect the board back by 28 SEP. I'll dig out my IBM 5160 PC/XT by then.
                        Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                        Comment


                          #13
                          Boards have shipped! They'll probably be in Tuesday or Wednesday next week. That gives me plenty of time to build a few up and test in my PC/XT that weekend.
                          Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

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                            #14
                            Boards are in!



                            I used my Stickvise (stickvise.com, you can buy through the Hack a Day store) to assemble. If you don't have one, just solder the board down to the XT-IDE first.



                            Surface mount components installed. Notice that I filed the ends off of the mounting through-holes. I plan on having the final version routed so that the holes come from the fab already cut in half. I think I will reposition the R1 legend, the copper break in the middle makes it far less readable than I was hoping.



                            Mounted to the back of the board behind U10. It helps to remove the solder from U10 pins 14, 20, 22, and 28 to get the daughterboard flat against the XT-IDE board. I just used a bit of solder wick, no need to fire up the vacuum station.



                            All wired up! Notice how TP1 on the daughterboard goes over to SW2? This lets SW2, switch 8 disable/enable Slot 8 functionality. This is a prototype rev 3 board, so there's no test point for the /CARDSEL pin. Production rev 3 boards (what everyone who bought one from me received) have a solder pad so you won't need to tack on to the edge finger. Rev 2 boards will need tacked on to the edge finger. Rev 1 boards will as well, if you've got one that has all of the edge fingers populated -- the ones I've got don't.

                            I don't have my IBM 5160 PC/XT set up at the moment, I'll dig it out this weekend and test. I'll build up another for the rev 2 card I've got and test with that as well.
                            Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

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                              #15
                              It's a pretty good looking mod so far. Can't wait to see the final.

                              Heather

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