MattyL Posted July 28 Share Posted July 28 (edited) Hi people, I picked up this old global stealth tech for a bit of fun, as always the Ram/rom card was obliterated. I could not be arsed to repair it, but just for the project thought I'd have a go at making a new one from scratch. Here's a few pics of the project Edited July 28 by MattyL Link to comment Share on other sites More sharing options...
MattyL Posted July 28 Author Share Posted July 28 (edited) Here's the card stripped back. This card was so minging I had to soak it and cut everything off. I always wear partical mask when working on battery damage. The board looks better but there are so many tiny breaks, virtually every trace. Edited July 28 by MattyL 1 Link to comment Share on other sites More sharing options...
MattyL Posted July 28 Author Share Posted July 28 (edited) Here's my board design... its a WIP in the picture. Yellow is the silkscreen Red top copper Green bottom copper. The numbers near the 64 way connector holes were just for working with and checking. Checking was the worst part. With no schematic I worked out each individual line and 'hooked' them up to a legend so I could highlight each trace when checking. Eg Address 1, data 4, cs1. Pic of that to follow Edited July 28 by MattyL 1 Link to comment Share on other sites More sharing options...
MattyL Posted July 28 Author Share Posted July 28 Here are the boards... made in China. Really cool to get my design built. I usually work with pencil paper and manufacture everything myself by hand so I really enjoyed this. 2 Link to comment Share on other sites More sharing options...
MattyL Posted July 28 Author Share Posted July 28 (edited) Initially I had one small teething problem. I replaced hyundai hy6264 ram with Hyundai hy 6264 ram which I had already. The ram speed was different (latency) it should be 70ns but I Fitted 100ns because that's what I had and use on all my other 6264 boards...I have never had to take note of the suffix code up until now. The ram cleared with everydoor close even though the volts were good so I started looking at what had fitted. Ram speed is something I've never come up against before and something new learned. The only 70ns Faster Ram I had was 62256 but that's fine to use it as it will still address it like normal. It ran Totally perfect after 😁 Edited July 28 by MattyL Link to comment Share on other sites More sharing options...
MattyL Posted July 28 Author Share Posted July 28 (edited) Finished. Really happy with how it turned out. Not a bad little project 😎 Also tidied the machine up 20220728_074921802.mp4 Edited July 28 by MattyL 6 Link to comment Share on other sites More sharing options...
Generation Posted July 28 Share Posted July 28 Credit where it's due - fantastic work Link to comment Share on other sites More sharing options...
Zippy Posted July 28 Share Posted July 28 Nice one dude, you certainly know your stuff. 1 Link to comment Share on other sites More sharing options...
MikeB Posted July 28 Share Posted July 28 That looks amazing! What a project 👌👌 1 Link to comment Share on other sites More sharing options...
martinb Posted July 28 Share Posted July 28 Yep top marks from me too - that takes time and commitment (just a shame it has to be made in bloody China I guess the UK option is too hard to find and too expensive Matt?). Top job from your garage/workshop - love it. 1 Link to comment Share on other sites More sharing options...
superbank Posted July 28 Share Posted July 28 Fantastic stuff Matty, good to see that this sort of thing is possible. The battery damage on the board was by the far the worst I've ever seen! 1 Link to comment Share on other sites More sharing options...
MattyL Posted July 28 Author Share Posted July 28 Thanks people. Where there's a will there's a way 👍 Link to comment Share on other sites More sharing options...
Player Posted Wednesday at 07:52 AM Share Posted Wednesday at 07:52 AM Very impressive mate! 1 Link to comment Share on other sites More sharing options...
ontarget4u Posted Wednesday at 01:15 PM Share Posted Wednesday at 01:15 PM Fab job. Nice work 1 Link to comment Share on other sites More sharing options...
Phil1974 Posted Wednesday at 03:23 PM Share Posted Wednesday at 03:23 PM Fantastic work , a credit to yourself well done very impressive 👍 1 Link to comment Share on other sites More sharing options...
Davep180 Posted Wednesday at 05:49 PM Share Posted Wednesday at 05:49 PM Wow. Great stuff. It's good to know there is an alternative fix for this sort of problem. 1 Link to comment Share on other sites More sharing options...
orchid Posted Thursday at 12:50 PM Share Posted Thursday at 12:50 PM This is excellent work!! I’ve only seem a few stealth boards but imagine others have them. Will you be offering these boards for sale or is this just a closed personal project? Great work again! J Link to comment Share on other sites More sharing options...
MattyL Posted Thursday at 01:11 PM Author Share Posted Thursday at 01:11 PM Thanks, I don't think there's a demand for the machines, It was done as a side project and for developing the skills. I have a couple i can make up if someone honest needs one... not for traders or flippers of course 😁😎 Link to comment Share on other sites More sharing options...
orchid Posted Thursday at 02:49 PM Share Posted Thursday at 02:49 PM How many did you have to get built and was it cost effective? J Link to comment Share on other sites More sharing options...
Player Posted Thursday at 02:49 PM Share Posted Thursday at 02:49 PM 1 hour ago, MattyL said: Thanks, I don't think there's a demand for the machines, It was done as a side project and for developing the skills. I have a couple i can make up if someone honest needs one... not for traders or flippers of course 😁😎 Nice one Matty, don't be helping any of them dealers out Link to comment Share on other sites More sharing options...
MattyL Posted Thursday at 04:01 PM Author Share Posted Thursday at 04:01 PM 57 minutes ago, orchid said: How many did you have to get built and was it cost effective? J No it's not cost effective sadly just a fun project for me to challenge myself. I went for the minimum 5 made. I paid more for purple but How cool does that look?😎The maygay m1, epoch stuff like that has been remade by several people but they work out very expensive, outdated obsolete or custom parts etc... its not worth the hassle either so it's all just for fun. You're obliged to fix any problems or sort out mistakes people make too (blowing your shit up 🤮) If I paid myself the usual 10p an hour to repair rate to fix the original board these cost more in time for sure 😁. The biggest time consuming and labour part is meticulously checking everything. The voltage monitor IC are pricey at £14 too. Having said that my hobby is going out on a Sunday and picking up cheap dead machines and having a bit of fun so developing my skills, unwrapping my own PCBs ive designed and built... bringing and old piece of junk back to life is well worth it from a bloke in shed engineering point of view 👍 2 Link to comment Share on other sites More sharing options...
orchid Posted Thursday at 06:12 PM Share Posted Thursday at 06:12 PM There is nothing more satisfying that creating something yourself, no matter what that is. J 3 Link to comment Share on other sites More sharing options...
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