Видео

I seem to recall back in the day, numerous third-party cpu coolers that had configurations for socket 3, 4, 5, and 7

Did you test for the FDIV bug? I made it a business buying bad Pentiums off eBay circa 1999. Intel was legally required to replace their defective Pentiums and were running out of Socket 4's so I negotiated for Socket 7 233MMX! Great vid as usual

I remember GTA in 3Dfx mode. That was awesome.

If I remember correctly, back in the days when you wanted to play high color or high resolution in DOS games, you had to use an utility called "UniVBE" to activate some SVGA compatibility with most graphics cards...

ohh that sucks hahha your good i cant fix that at all very good fix

Am I the only one who can't hear the coil noise?

Woah there. SXE are low esr and part of the switching circuit. The replacements seem like general purpose, they’ll die pretty quick . I rebuild a lot of psus. I’ve had to recap smps before because someone used general purpose caps and the psu couldn’t bootstrap

I sometimes rejuvenate the hot glue by running my hot air over it, to stick down new parts. Especially coils, big caps.

You said the PSU was a bit sooty. Meaning, there was something getting rather toasty, inside. Two common culprits in my experience are Diodes and Resistors.

Fun fact, "Marcon" would be pronounced Ma-Ru-Ko-N in Japanese, with Maru meaning round (Japanese love puns).

The reason gluing the coil tamps down on coil whine is because the coil is actually vibrating and the glue is damping the vibrations. Coil whine is not necessarily a real issue but if you find it really annoying that might be worth doing.

Gluing the coil is an option. The kludge solution is to wedge something soft enough to damp the noise between the coil and something else. Another potential option is to put heat shrink over the coil.

All electrolytics - even the good ones - fail eventually. God knows I replace them often enough. BTW, did you investigate whether your particular CPU was one of the early ones with the math error?

Isn’t a new AT PSU $35 on eBay? How much for all those caps? Is this a proprietary supply?

Coil noise is a feature not a problem. Designing switch mode is a about compromise, gluing components is sometimes a design requirement

Coil whine is not usually a 'fault' it's more of an annoyance, basically when the coil is working at high frequency, it can sometimes vibrate like a mini speaker at a harmonic of said frequency, you can get inductors that are designed not to, or yes, you can glue the Coil (doesn't have to be glued down, just dampen the vibration of the coils) - replacing the coil for a new same value could fix it - but that's only if the replacement is built a little better to not whine... Just glue it :)

Just scope the PSU? If it's not too ripply under load, then there's no need to search for a fault, it's fine. Use silicone rated for power supply use to damp the offending magnetic, such as Silastic or Kafuter. There's nothing sketchy about that. Actually use it all over the place, like on that bodge capacitor, because why not. Look, when you look inside a PSU and it looks like a Peter North scene in there, that's for a reason, this is considered a high vibration environment due to all the large magnetics. When you don't gunk it all up, things break off, component legs and pads fatigue. Plus the noise. I think S3 Vision should work! Maybe it just needs UniVBE. Most games came with UniVBE on disk if the game supported VESA/SVGA modes. Try different versions too. My first PCI card was one of those i think and it needed a LIBERAL application of UniVBE all over the place, i wager a conclusion that the VESA BIOS on these was very incomplete. Oh i haven't looked carefully, i'm watching semi asleep on a netbook, so i'm sort of saying this blindly but the buzzing magnetic should be the SB power transformer. I know it's not ATX but given it has soft power, it must be built similar to an ATX PSU, with a secondary controller and whatnot. So that whole circuit doesn't need to work well, it just needs to work. You can also sort of stop looking across most of the PSU since that's all its own circuit, like you should be able to tell what belongs there though idk maybe not all people stare as much at PSUs as i happen to.

I don't know about gluing the coil, but I do know that wax potting coils is very common. They do it to stop the very problem you seem to be having. I would remove the component and dip it in some liquid paraffin wax.

I used to service some equipment that had a large (2" / 50mm) inductor on the output board, and if the inductor wasn't anchored to the board with epoxy or RTV, it would make an annoying high-pitched whine.

I think that now it is easier to buy PC XT than machine with Pentium 60/66 Mhz

is that memory chip on the motherboard inserted fully?

cool machine being a socket 4 are they rare considering the socket 5 and 7 wasnt that far away, weird socket 6 isnt in the Pentium scale its a socket 3 486 socket with 2 extra pin holes. i take it the coil doesnt simply need replacing in which case i would take the advise of gluing it down.

Fun fact I figured out for the heatsink on a socket 4; a pentium pro heatsink is perfect replacement. You just need to bend in the long end a little. Plus it looks cool as. :)

Coilwhine, the GTX 400 series had a major problem with coil whine. Should be ok to sound like that they said. Thanks for sharing, great vid :)

Time for some glue!

i never played gta on the pc. but i did have it for ps 1

Yes, gluing might feel sketchy, but that is how it is done these days. Since GTA supports Gravis, maybe get a PicoGUS to try out the GUS music. Also PicoGUS can emulate a few different sound cards, IIRC, since you are running low on soundcards :)

Was there a video about this machine before? I don't remember it, what's that thing hanging off the side of the CPU socket?

Regarding the power supply noise, coil noises often change with conditions. I'd suggest getting some kind of variable load and connecting it to one of the rails and fiddling it while the system is on. Does the noise go away if more load is put on one of the rails? edit: I see later you found the noise reacts to physical pressure on the coil. Glue 'em down!

Great video. But don't bend the legs :-)

Gluing it will be fine.

I remember having a 486SX back then and playing GTA was simply not an option. My brohter had a 486DX-40 and on that machine it somehow works. I got a used Pentium 100 later that year, including an 2MB PCI graphics card with Cirrus Logic chipset. Guess what the first game was I tried out after assembling the new parts? It was just a blast seeing this game running in a playable state. You could even change resolution in this game when playing with high color mode, I think it was with pressing F11(?). Looking forward for the 3dfx-upgrade. Great video. 🙂👍

On GTA I if you tap either F10 or F11 you can change the screen resolution, certain cards go to 800x600x16 in hires mode and F8 disables the frame limiter and F6 or F5 pauses the game iirc

How about trying Display Doctor? Some video chipsets from that era don't fully support VESA graphics modes.

What is that PCB between the Mainboard and CPU?

Gluing coils down is done as commonly as gluing down capacitors. Totally normal standard procedure.

One of the additional vram chips seems to be not fully in its socket. That may be the culprit, too...

If the glue, duck tape, hammer or WD-40 fix it, then it's a win isn't it? 😁 Try gluing it, if it's electronic fault then it should not fix the problem, right? 🙃

modern stuff uses glue on coils because they vibrate. It's normal even with modern electronics.

I had that computer, I got it very cheap back in the day at a market and it would crash sometimes, I think about after a year it stopped working so I went back to a 486.

Haha, I have this same one but with a 100MHz DX4, model name is 330-100DX4

You have the footprint on the PCB to mount the "bottom" cap, on a top side...

Forget that GTA crap, Try Carmageddon !

Just hot snot that transformer

First of love your content and videos as always. Some of the comments here are insane. It’s easy to scold (hilarious terminology likes he’s a child) a guy for messing up. You know he didn’t have to show that he messed up he did it to show everyone makes mistakes. But the people who commented on this situation seem to think they would never make a mistake and that no one else ever should either. Most of these jokers have never and will never have access to such cool computers or equipment And if you think you can do better make your own channel ( let me know how that works out for you Monday armchair quarterbacks) using a paper clip maybe didn’t work in his situation but it’s not that insane to do. We all have done a paper clip job to say use two power supplies with one system or for experimenting. I’m glad that the 8bit guy was honest about his work and showed it all good or bad and I’m glad Epictronics saw a opportunity to fix such a pc for those of us who wanted to see that model working and fixed. RUclips and electronics communities benefit from both types of tech enthusiasts.

floppy is named "Systen 1"

How do you find compatible CRTs

I would glue the coil to the pcb

NEVER use machined sockets for ICs. Only stupid people do. 🙄

DO NOT "adjust" an Atari SM124 monochrome monitor. A screen resolution of 640 X 400 is a "WYSIWYG" screen resolution, which is perfect for desktop publishing, drawing, and MIDI. When you "adjust" the screen, you mess up the "WYSIWYG" image. The same thing is true with the original Macintosh computers. NEVER adjust the screens, only stupid people do. 🙄