IBM
Was it worth 27 repaired traces? Trash to treasure 486
Was it worth 27 repaired traces? Trash to treasure 486 VLB build. (am5x86 overclocked)
#worth #repaired #traces #Trash #treasure
“Epictronics”
Severely battery damaged Shuttle HOT-419 R1 Motherboard.
Found at Computer Reset repair video here:
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Many VLB video cards don't work with bus speed over 40mhz. Some of the Curris logics 542X and S3 VLB cards tend to play nice with 40 and even 50mhz bus.
next challenge installing a am5 processor via adaptor
Same problem I had with Socket Blasters. The buck modules they're designed for are junk. Going to design my own regulator pcb to use with them.
Remember the case in our university the server was called IDEAL486! 😀
That socket blaster from scrap computing is a real nice addition to the retro community
I've been trying to place your accent for almost 2 years now. Are you dutch? 🙂
Forthcoming video on an all-new build? Not the usual stuff, but I'm in!! Maybe precisely because of that: I'd like to watch your take on that kind of thing.
Remove the wires at JP64 and solder Jumpers.
The position now is 5V, the other position is 3.3V
Then measure Q2 directly above. There is 5V, GND and a connection to JP64 pin 5/6.
Now solder a 3.3V linear regulator there. Think about it twice as you maybe want a heatsink.
C20/C21 are regular decoupling caps. 6.3V/10µF or similar.
Newer revisions have more space for the heatsink as in this release it's a bit limited!
Try replacing the pot on the regulator with an appropriate resistor it wont be adjustable but more likely to be stable.
I remember reading back in the day how hard the early 486 MBs were to run at 50MHz. This video shows the reality of it. Great to see…. not that I wish fighting a MB on anyone. It explains why later 486 processors never released with 50MHz bus support past the first round of 486s.
I don’t know about this particular board, but there are often timings in the BIOS that can affect success at 40-50MHz (but I think the cheapo buck converter might be hurting you too. I tried to use the same one in a project this week and failed miserably)
Oh man the nostalgia, lol. I had the small tower version of that case.
VLB is actually a CPU bus, and your CPU is undervolted, so maybe this is the reason most video cards did not work
Check your video cards, maybe they have jumpers(something like wait states)
I can’t imagine anything would be worth repairing 10’888’869’450’418’352’160’768’000’000 traces…
On thing, that I certainly don't miss from "ye goode olde tymes" are those horrible cases. Impractical, sharp edges and butt-ugly… and that beige colour… yeah, no.
That said, the period (mid 90ies) saw the dawn of black cases… Dell in 94/95 and IBM in 96.
Even if 96 is a bit late in the 486 game, it's also the beginning of AMD's 5×86. So, in conclusion, you certainly can have a visually more pleasing case from the period (e.g. IBM Aptiva). Or use a spray can.
Concerning the 4x Multiplier… does it even work at all, beyond the 33 MHz Bus frequency? Do you get 160 or 200 MHz on the clock pin?
Have you checked the temperature of the buck converter?? Underneath the CPU it's pretty snug.
On that note, might want to try a more potent / reliable buck converter. Maybe one that's not mounted on the socket, but externally.
Does the socket thingy come with pins for an external converter??
I had this motherboard and it cost me a lot of nerves 🙂 I didn't have as much patience as you and sold it 🙂
That case is hilariously big. Love it! 👍
That's a big case! I'm not sure I am a fan of that fan controller: the fan will start when the CASE of the PSU is hot? Uhm… Anyways, nice job as usual! This reminds me my recent journey in retro PC with the difference that when you tweak/overclock this is expected I guess! Thanks for the video!
Nice work! I have a 486DX2-66 and needed a heatsink. I found a 3D-printable heatsink holder which took a 40x40x20 heatsink, it sits between the CPU and the socket. It's a very good solution if you can't get a 486 heatsink.
Looks like that regulator module just doesn't have enough oomph for the CPU. Maybe try another one. I wonder how awful would that supply voltage look on a scope.
Back in the mid 90's, I had a VL-Bus Pentium board. It came with a 60 Mhz first gen Pentium, complete with the math flaw. I had a Tseng labs VL video card with 2MB ram and this super cool Tekram caching VL bus disk controller. I think it had IDE and floppy ports. It had 4 30 pin memory slots, I believe I had 4MB on it. Unfortunately they are all lost to time.
Have you checked the 5V line to the socket, also??
Seems that buck converter can't supply enough current which is why the voltage is dropping, once the CPU crashes the current draw drops and the voltage rises again.
I had a 10 5.25" bay full tower back in the 90s.. got it from a friend who's dad worked for the state.. it was STUPID how massive that thing was.. no 3.5" bays, had to use an adapter for the 3.5" obligatory floppy drive.. it had this silly removable plastic rectangle that went around the base to help keep it from falling over it was SO top heavy. What a wonderful time to be alive back then, I've said that before on your videos. I miss those days SO bad, not only for the computers.. it was just such a more innocent time. It was HARD to get products, you had *well I had to go to computer shows, we had one close to me at an old horse racetrack in Cherry Hill, it would be there a couple times a year. I'd go every time and buy stuff.. used, new.. working, not.. ram, cpus.. oh the good days!!
Edit: I will say… like you're dealing with finding manuals for the motherboard jumpers.. I clearly remember back in the good days, you really did have to know what you were doing, you could easily get taken advantage of buying things if you weren't 100% sure about the system you were working on.. you could EASILY mess things up and be quite devastated..
OH NO! Your Pinecil!
Another Tower! Haha I wasn't expecting it so soon. Good work, it looks awesome.
I scored an Aopen full tower the other day from marketplace too, have to work out what to build in it now (perhaps a sleeper with my desktop? It's not the Inwin I'd love for that but beggers can't be choosers haha)