toddtmw Posted July 8, 2019 Share Posted July 8, 2019 Hi. I've googled, I've measured, I've even used the 3-d models for the plugs, but I cannot find a definitive answer. I've seen people say things like read the sio spec, etc. I'm trying to figure out the pin pitch for the SIO port. Looking at the 3-d printed SIO plug, it looks like it is about 3.65 mm or maybe 1/7 inch (Which is closer to 3.60 mm, but when I use that, it doesn't seem to line up on the plug). Anyway. Can someone tell me definitively, what pitch the pins are? Bonus points if you know where I can get pins that are already in a header with that pitch. I looked on Digikey and it appears they go from 3.5 to 3.5 to 3.81 mm. Skipping 3.6 and 3.65 altogether. Thank you for any advice anyone can share! (I promise whatever comes from this, if I am successful) will be shared back to all under CC. -Todd Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 8, 2019 Share Posted July 8, 2019 17 minutes ago, toddtmw said: Hi. I've googled, I've measured, I've even used the 3-d models for the plugs, but I cannot find a definitive answer. I've seen people say things like read the sio spec, etc. I'm trying to figure out the pin pitch for the SIO port. Looking at the 3-d printed SIO plug, it looks like it is about 3.65 mm or maybe 1/7 inch (Which is closer to 3.60 mm, but when I use that, it doesn't seem to line up on the plug). Anyway. Can someone tell me definitively, what pitch the pins are? Bonus points if you know where I can get pins that are already in a header with that pitch. I looked on Digikey and it appears they go from 3.5 to 3.5 to 3.81 mm. Skipping 3.6 and 3.65 altogether. Thank you for any advice anyone can share! (I promise whatever comes from this, if I am successful) will be shared back to all under CC. -Todd It might help if you explained what you're trying to do. The SIO plug was - at one time - a stock Molex part (I used a Molex-branded SIO cable for my SDrive-MAX build last summer). Others have in recent years started 3D-printing new SIO cables with female ends. Still others like Mytek have produced modern-design motherboards that accommodate vintage SIO male jacks as used on Atari computers and disk drives. So basically what I'm trying to say is, this should be a solved problem. Quote Link to comment Share on other sites More sharing options...
toddtmw Posted July 8, 2019 Author Share Posted July 8, 2019 I'm trying to design a 3-d printed SIO port (with the pins, I guess that is male, even though the plug with the holes go into it? I feel like I'm in 6th grade sex-ed all over again, except without the uncomfortable gym teacher...) I was thinking that I'd rather put one (or maybe 2) of those on my SDM case and use standard SIO cables to connect it. I have the actual 3-D model done, and I can actually take the part with the holes and cut out the sides and slip it over an SIO port and the pins go through the holes. I just don't know where to get the pins to put into the holes to complete the port. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 8, 2019 Share Posted July 8, 2019 So you’re trying to recreate the male SIO port (the part with the pins), as used on Atari computers and disk drives? So far as I know, no one has yet started making and selling replacements for those, though I’m sure it’s do-able. The plastic shell is not the hard part. As you’ve already figured out, the hard part are the 13 pins inside that plastic housing all of the correct gauge, all precisely bent at 90 degree angles to mate to the mounting footprints on a PCB ... That part is tough. However, for a modern device you could side-step that issue. Use straight-through copper pins and solder or otherwise attach wires to the correct pins, and use the through-holes in the SIO jack housings to attach the connector to the board. Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted July 8, 2019 Share Posted July 8, 2019 Here is a PDF that should help. SIOSPECS.pdf 2 Quote Link to comment Share on other sites More sharing options...
BillC Posted July 8, 2019 Share Posted July 8, 2019 (edited) The SIO connector is similar to multiple coaxial connectors integrated together. The outside of the coaxial plug is male but it also has a female socket in the center, while the corresponding coaxial jack is female with a male pin in the center. Edited July 8, 2019 by BillC Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted July 8, 2019 Share Posted July 8, 2019 jack with center pin male, plug with center hole female... Quote Link to comment Share on other sites More sharing options...
toddtmw Posted July 8, 2019 Author Share Posted July 8, 2019 5 hours ago, Kyle22 said: Here is a PDF that should help. SIOSPECS.pdf 637.41 kB · 10 downloads As I alluded in my OP, I already looked at that. It didn’t. Quote Link to comment Share on other sites More sharing options...
Mr Robot Posted July 8, 2019 Share Posted July 8, 2019 (edited) The crimps required for the SIO plug are Molex, KK396 which have a standard pitch of ... wait for it... 3.96mm This page (taken from the specs) looks to be pretty useful! Edited July 8, 2019 by Mr Robot Added Maths 4 1 Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted July 8, 2019 Share Posted July 8, 2019 measurements in inches not mm Quote Link to comment Share on other sites More sharing options...
Mr Robot Posted July 8, 2019 Share Posted July 8, 2019 3 minutes ago, _The Doctor__ said: measurements in inches not mm Did we both post at the same time when I added the conversion? Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted July 8, 2019 Share Posted July 8, 2019 more than likely Quote Link to comment Share on other sites More sharing options...
toddtmw Posted July 8, 2019 Author Share Posted July 8, 2019 1 hour ago, Mr Robot said: The crimps required for the SIO plug are Molex, KK396 which have a standard pitch of ... wait for it... 3.96mm This page (taken from the specs) looks to be pretty useful! I said I didn’t see it, not that it wasn’t there. ? this is awesome. Thank you. Quote Link to comment Share on other sites More sharing options...
NISMOPC Posted July 8, 2019 Share Posted July 8, 2019 1 hour ago, Mr Robot said: The crimps required for the SIO plug are Molex, KK396 which have a standard pitch of ... wait for it... 3.96mm 1 hour ago, Mr Robot said: 3.96 mm or 3.556 mm Quote Link to comment Share on other sites More sharing options...
Mr Robot Posted July 8, 2019 Share Posted July 8, 2019 7 minutes ago, NISMOPC said: 3.96 mm or 3.556 mm 140 mils 1 Quote Link to comment Share on other sites More sharing options...
toddtmw Posted July 8, 2019 Author Share Posted July 8, 2019 220, 221. Whatever it takes. So. Is it 3.56 or 3.96? so confused. ? Quote Link to comment Share on other sites More sharing options...
Mr Robot Posted July 8, 2019 Share Posted July 8, 2019 Well obviously the engineering drawing is the correct one. 140 mil pitch, 40 mil ⌀ pins with 25 mil square tails. The 3.96 crimps are not 3.96mm wide, they fit Molex's 3.96mm (155mils) pitch connectors but the crimp is smaller to allow for the connector to have some plastic and air around it. We are lucky that they fit into the SIO plug as well (less air). as @DrVenkman says, the tricky bit is finding the correct 90° pins. Lotharek gets around the problem by only using straight pins and a simple cutout for the shell. 1 Quote Link to comment Share on other sites More sharing options...
E474 Posted July 8, 2019 Share Posted July 8, 2019 Hi, I use KK 3.96 crimps (just to be clear, I use them in the female 3D printed SIO connectors that I make for non-commercial use). I find that they can be a little wide, but make them narrower by squeezing them with a pair of pliers. Gavin1968 (?) has posted a part number for them on another thread (am on phone, so not going to search for the link). Searching eBay for KK 3.96 crimp connector will usually list someone selling a hundred or so for a fairly low price. You also need a crimp connector tool, such as an sn-28b, which you can Google shop for some listings for. I'm beginning to wonder if the 8-bit forum needs a sub-forum for homebrew hardware. Hope this helps. Quote Link to comment Share on other sites More sharing options...
Albert Posted July 8, 2019 Share Posted July 8, 2019 Several posts had to be removed in this thread due to the disgusting and intolerant views posted by two members who decided to attack gender issues as they relate to people versus connectors. There's no place for that on AtariAge, and I don't want to see it again. ..Al 4 1 2 1 Quote Link to comment Share on other sites More sharing options...
Mclaneinc Posted July 8, 2019 Share Posted July 8, 2019 Surely the blue print is correct? And for my info, what does the typ refer to? As for Alberts post, NO, nothing to do with me... Quote Link to comment Share on other sites More sharing options...
Mr Robot Posted July 8, 2019 Share Posted July 8, 2019 (edited) typ = typical typ is used to describe one of a thing and imply that all the other same things are the same, so they give dimensions for one pitch and say typ so they don't have to give the dimensions for every pitch. Edited July 8, 2019 by Mr Robot Clarity over Brevity 1 Quote Link to comment Share on other sites More sharing options...
Mclaneinc Posted July 8, 2019 Share Posted July 8, 2019 Thank you kind sir, only built a couple of PCB's in my life with the old etch resist pen etc and they were dead simple (think they were auto fire units for the Atari (inline)) Things like blue prints just confuse me, so much info..Ta for that info..Keeps the brain cells ticking.. Paul.. Quote Link to comment Share on other sites More sharing options...
Gavin1968 Posted July 8, 2019 Share Posted July 8, 2019 1 hour ago, E474 said: Hi, I use KK 3.96 crimps (just to be clear, I use them in the female 3D printed SIO connectors that I make for non-commercial use). I find that they can be a little wide, but make them narrower by squeezing them with a pair of pliers. Gavin1968 (?) has posted a part number for them on another thread (am on phone, so not going to search for the link). Searching eBay for KK 3.96 crimp connector will usually list someone selling a hundred or so for a fairly low price. You also need a crimp connector tool, such as an sn-28b, which you can Google shop for some listings for. I'm beginning to wonder if the 8-bit forum needs a sub-forum for homebrew hardware. Hope this helps. These are the ones I have used for hundreds of SIO plugs I have made, https://www.alliedelec.com/product/molex-incorporated/08-50-0105/70385386/ but that isn't the side he is looking for. Quote Link to comment Share on other sites More sharing options...
ivop Posted July 8, 2019 Share Posted July 8, 2019 51 minutes ago, Gavin1968 said: These are the ones I have used for hundreds of SIO plugs I have made, https://www.alliedelec.com/product/molex-incorporated/08-50-0105/70385386/ but that isn't the side he is looking for. Actually, those are genderless pins They don't "receive" anything inside (female) and don't "put" something inside (male). They just rub against something Well, strictly speaking they are not 100% genderless because they don't pair with identical pins, but with male pins in this case. https://en.wikipedia.org/wiki/Gender_of_connectors_and_fasteners#Genderless_(hermaphroditic) Quote Link to comment Share on other sites More sharing options...
E474 Posted July 8, 2019 Share Posted July 8, 2019 Hi, It was the 08-50-0105 part number that I was thinking of. Thanks! 1 Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.