VOGONS


Reply 10861 of 16752, by keropi

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Mister Xiado wrote:
https://www.geocities.ws/oldternet/icxw20.gif https://www.geocities.ws/oldternet/disk.gif […]
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nice ones!

🎵Link to buy a PCMIDI mpu
🎧Orpheus soundcard project
💻WTB Amstrad PC7486SLC-33 system

Reply 10862 of 16752, by the_ultra_code

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luckybob wrote:

UV light.

It's for the chips with windows.

Ah, I see.

Also, I decided to finish replacing all of my 1500uf 6.3v electrolytic caps on my Asus P3B-F with polymer equivalents. This time more of a preventative measure instead of in an attempt to fix something, although I have noticed after doing this that the still non-functioning PS/2 mouse port causes less problems less often if I have a PS/2 mouse plugged in versus beforehand, which is nice.

rndEptLl.jpg

Looking at the other caps, I noticed that there are electrolytic caps with the same ratings, with the only differences between them being height. If I wanted to replace them with polymers, could I use one type of polymer for both, or would I want to find polymers of equivalent heights for each type of electrolytic I'm trying to replace?

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Reply 10863 of 16752, by liqmat

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Cleaning up some Socket 8. That middle guy looks like he got a sunburn, but we'll see in testing.

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Reply 10864 of 16752, by Errius

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I have a motherboard with nonfunctional PS/2 keyboard port. (USB keyboard is OK.) What causes this? Can it be repaired?

“Your mission is to attack and destroy the Apple Computer manufacturing plant. You are allotted 35 bombs and 60 lasers."

Reply 10865 of 16752, by the_ultra_code

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Errius wrote:

I have a motherboard with nonfunctional PS/2 keyboard port. (USB keyboard is OK.) What causes this? Can it be repaired?

IDK. You can try replacing the keyboard port yourself, but whether that would solve the problem I have no clue.

I replaced the dual PS/2 connector on my board with a brand-new one, and that didn't solve the problem. However, I have noticed that the more capacitors I replace on the board, the better the situation gets with my non-functioning PS/2 mouse port (the PS/2 keyboard port works flawlessly). BIOS acts weird less. A PS/2 mouse plugged in does less to the system negatively. So on. So I theorize, if I replace every "old" cap on my motherboard with a brand-new polymer or electrolytic cap, it would either actually fix the PS/2 mouse port and make it functional, or at the very least make it so it doesn't matter what I do, the PS/2 mouse port won't work, but it won't affect the rest of the system.

Hence, my question regarding electrolytic caps (so I know how to best replace them): If there are two electrolytic caps with the same specs and only differing in height, can I replace both of them with one type of polymer cap, or do I have to get a polymer cap with the same height as each type?

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* USB2 PCI Card in Win98 SE
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Reply 10866 of 16752, by bjwil1991

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Did a video shoot of my modified GameBoy Color:

https://www.youtube.com/watch?v=NW5UuLMB1VI

Discord: https://discord.gg/U5dJw7x
Systems from C64 to FX-6300.

Reply 10867 of 16752, by luckybob

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@the_ultra_code

The height only is an issue near teh cpu socket and the pci/agp slots. As long as nothing touches the cap, height doesn't matter. But for the ones between pci slots, make sure teh cap is shorter than the slot connector..

It is a mistake to think you can solve any major problems just with potatoes.

Reply 10868 of 16752, by canthearu

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the_ultra_code wrote:

Hence, my question regarding electrolytic caps (so I know how to best replace them): If there are two electrolytic caps with the same specs and only differing in height, can I replace both of them with one type of polymer cap, or do I have to get a polymer cap with the same height as each type?

Typically, phyically larger capacitors have better ESR and ripple current performance for a given voltage/capacity.

You should look up the specs of the original capacitors and try to find reasonable matches for ESR as well as capacity and voltage.

The VRM capacitors around the CPU can be replaced for polymer solid capacitors if you are unable to find a suitable wet electrolytic replacement. You you switch to polymers, you would normally search for a capacitor about half the capacity of the original one but that has reasonably close ESR to the original.

Reply 10869 of 16752, by wiretap

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Got this Abit FP-IN9 SLI board for $12 that was supposedly not posting / blank screen. Thought I would give a shot at repairing it. Turns out that the only thing wrong was the CMOS jumper was missing. I put a jumper in the "normal" position and it works fine now.. haha. Easiest 5 second repair ever. Now I can put my QX6850 and 8800 GTX SLI to good use.

POsVCQQl.jpg

Circuit Board Repair Manuals
Turbo Display Project
Dual Socket 8 Project

Reply 10870 of 16752, by looking4awayout

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I'm in the middle of searching for a new 14" CRT monitor for my computer. Contacted a bunch of sellers and got some interesting offers, such as a Samsung Syncmaster 3 and an ADI Microscan 3G, both pretty good monitors but I'm not receiving any message from the sellers of the ones I'm most interested into: an Olivetti CDU 1458/HA23 and another CRT that seems like another ADI (but this one has fully analogue controls) or a CTX.

I didn't remember looking for a vintage CRT would be such a frustrating and time consuming job.

My Retro Daily Driver: Pentium !!!-S 1.7GHz | 2GB PC166 ECC SDRAM | Gecube Radeon X1950 Pro 256MB OC | 128GB Lite-On SSD + 500GB WD Blue SSD | Creative Sound Blaster Live! CT4620 | Windows XP Professional SP3

Reply 10871 of 16752, by the_ultra_code

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luckybob wrote:

@the_ultra_code

The height only is an issue near teh cpu socket and the pci/agp slots. As long as nothing touches the cap, height doesn't matter. But for the ones between pci slots, make sure teh cap is shorter than the slot connector..

canthearu wrote:
Typically, phyically larger capacitors have better ESR and ripple current performance for a given voltage/capacity. […]
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the_ultra_code wrote:

Hence, my question regarding electrolytic caps (so I know how to best replace them): If there are two electrolytic caps with the same specs and only differing in height, can I replace both of them with one type of polymer cap, or do I have to get a polymer cap with the same height as each type?

Typically, phyically larger capacitors have better ESR and ripple current performance for a given voltage/capacity.

You should look up the specs of the original capacitors and try to find reasonable matches for ESR as well as capacity and voltage.

The VRM capacitors around the CPU can be replaced for polymer solid capacitors if you are unable to find a suitable wet electrolytic replacement. You you switch to polymers, you would normally search for a capacitor about half the capacity of the original one but that has reasonably close ESR to the original.

Good to know, good to know. However, a new question arises: How in the hell am I supposed to look up some of these caps? 🤣

Digikey probably isn't the best site for looking up decades-old caps, and on most, if not all of these caps, they don't have printed on them some serial number to making looking up their specs easy. So, does any one know any good sources to find information for these old caps, or am I just going to have to search in the dark until I find by luck the data sheet on a specific cap?

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Reply 10872 of 16752, by oeuvre

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wiretap wrote:
Got this Abit FP-IN9 SLI board for $12 that was supposedly not posting / blank screen. Thought I would give a shot at repairing […]
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Got this Abit FP-IN9 SLI board for $12 that was supposedly not posting / blank screen. Thought I would give a shot at repairing it. Turns out that the only thing wrong was the CMOS jumper was missing. I put a jumper in the "normal" position and it works fine now.. haha. Easiest 5 second repair ever. Now I can put my QX6850 and 8800 GTX SLI to good use.

POsVCQQl.jpg

dat zalman doe

HP Z420 Workstation Intel Xeon E5-1620, 32GB, RADEON HD7850 2GB, SSD + HD, XP/7
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Reply 10873 of 16752, by luckybob

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This is what I do:

Goto mouser.com
Select caps
Select nichicon
Select shape (axial, through-hole, etc)
Enter uf
Enter voltage
Enter diameter
Enter height (if necessary)
Sort by instock
Sort by amperage (descending)
????
Profit.

It is a mistake to think you can solve any major problems just with potatoes.

Reply 10874 of 16752, by clueless1

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I have 3 main retro PCs:
1) P200MMX MS-DOS PC (used often)
2) P2-400 Win98 with V2 SLI and SB16 (used rarely)
3) P3-933 WinME with GF3 Ti200 and SB Audigy (used rarely)

Months ago, the proprietary PSU in the P2-400 went bad and I didn't have the money or motivation to replace/fix it since I used the system so seldom. So finally, I got around to transferring the pair of Voodoo2's into the P3-933. I set up my older games (MotoRacer, Quake II, Unreal, Half-Life, Thief, MDK, etc) to use the V2 SLI while the newer games (Unreal 2, RtCW, Deus Ex, Undying, Jedi Knight II, etc) use the GF3. Aaaaannnd, the system still gets used rarely, but at least I can run games on the Voodoo2s again if I get an itch. As some of you know, I mostly use my retro systems to play through the best FPS and RPG games of yesteryear, and I do have a few games on this system on my To Play list, so eventually I will get a lot of use out of this system again. 😀

The more I learn, the more I realize how much I don't know.
OPL3 FM vs. Roland MT-32 vs. General MIDI DOS Game Comparison
Let's benchmark our systems with cache disabled
DOS PCI Graphics Card Benchmarks

Reply 10875 of 16752, by Almoststew1990

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Set up a P3 650 / SB32 / MX440 for a project. Whilst i was waiting for installs, I thought I'd sort out my pile of cards (warning, image may be upsetting 😉)

kyyD7Soh.jpg

I thought I should check what I actually have these days:

AMD 390x with bodged cooler
Nvidia GTS240
ATI X1650 AGP
Nvidia 6600LE
Nvidia TNT2 Pro
Vodooo 3 2000 PCI
Elsa Glory Synergy+ PCI
STB something PCI video card (top one in image below)
PCI and PCI-E x4 capture card
SB Live!
Cmedia 8378
Cystral / Opti mystery ISA sound card
SB16 Vanta

HSDWy3lh.jpg
aJvICugh.jpg
it's a bit neater now but still gotta be careful when digging a card out.

Then I tried to change my cooler on my 6600LE to a quiet one. the push pins won't come out - the type you squeeze underneath to squeeze two tabs together, but it wouldn't budge. Not even with a blood sacrafice! Enough retro hardware for today I think.

Ug7Y6o1h.jpg

Ryzen 3700X | 16GB 3600MHz RAM | Nvidia GeForce 1070ti | 1Tb NVME SSD | Windows 10
Athlon 3200+ @ 3800+ (Venice) | Some Ram | Nvidia GeForce GTX645 / 7950GT
Slot 1 896MHz | 384Mb 112MHz RAM | Nvidia GeForce 3 ti200 | AWE32

Reply 10877 of 16752, by oeuvre

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Installed DesqView X in 86Box. If anyone wants it, here it is. Has DOS 6.22, QEMM, Windows for Workgroups 3.11 and plenty of other goodies. https://drive.google.com/file/d/1mZ4EcdGXzDRR … iew?usp=sharing

HP Z420 Workstation Intel Xeon E5-1620, 32GB, RADEON HD7850 2GB, SSD + HD, XP/7
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Reply 10879 of 16752, by the_ultra_code

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luckybob wrote:
This is what I do: […]
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This is what I do:

Goto mouser.com
Select caps
Select nichicon
Select shape (axial, through-hole, etc)
Enter uf
Enter voltage
Enter diameter
Enter height (if necessary)
Sort by instock
Sort by amperage (descending)
????
Profit.

Basically what I do on Digikey.

I'm guessing that since it can be almost impossible to find the right data sheets on specific capacitors, the best thing to do would be to first find the best-specced electrolytic replacement, and then try to find a polymer equivalent, and if there is no such thing, then go ahead and just use eletcrolytic, no?

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Other:
* USB2 PCI Card in Win98 SE
* Futuremark Result Browsers