Why do S3 Trio PCI video cards crash my A-Trend ATC-1425B?

Posted on Yesterday, 18:57

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The ATC-1425B is my first Socket 3 mainboard to have this issue. After the initial POST screen when memory has been counted and IDE / Floppy ports have been probed, right when the BIOS summary screen would appear, the monitor turns black and the system freezes. ISA cards and ATI PCI cards are …

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Re: UMC and PIC IDE controllers

Posted on Yesterday, 06:31

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some of these Super-I/O and IDE chips were pin compatible. One of the "PIC" chips (or both) might be some relabeled Winbond, SMC, Acer, whatever...

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Re: ProSide 386DX 25 -Battery Damage

Posted on 2024-05-24, 11:30

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Nearly all do, very few don´t.

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Re: FIC PA-2005 motherboard(v1.3) (non-user cache upgrade)

Posted on 2024-05-24, 08:40

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One single un-/ loose-connected pin at one of the chips will prevent the whole L2 cache from getting initialized by BIOS. Check all the solderings carefully for shorts and bad contacts!

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Re: ProSide 386DX 25 -Battery Damage

Posted on 2024-05-24, 05:20

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The writing "FTK-A253" suggests it´s some FTK mainboard. There´s probably one of the traces / vias still interrupted. To get at least some information about any ongoing activity and where the the start up process stops, you should buy yourself an "ISA POST-card". (They cost no more than $10.)

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Re: FIC PA-2005 motherboard(v1.3) (non-user cache upgrade)

Posted on 2024-05-22, 17:50

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today I put 4 64K x32 chips on one of my PA2005 and it´s working perfectly. There´s one thing I forgot to mention: When you add the 0 Ohm resistor at position R150 you must also remove the one at position R147 (and R148 if present). pa20051ma.JPG ctcm1m.JPG spsys1m.JPG L2 is just 25% faster than RAM …

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Re: ProSide 386DX 25 -Battery Damage

Posted on 2024-05-22, 07:37

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Would a 10k do as well ? Technically no, because a tolerance interval of 5% allows an upper limit of no more than 9.56K. 9.1K resistors are quite common. They are in the E24 table. https://www.newark.com/c/passive-components/resistors-fixed-value/through-hole-resistors?resistance=9.1kohm On the …

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Re: IDENTIFY MOTHERBOARD thread - if you don't know to identify motherboard, post here

Posted on 2024-05-21, 19:24

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I didn´t happen very often, but when I happened to insert a 5V CPU the wrong way it shorted the 5V rail so the PSU wouldn´t start. It wouuldn´t surprise me if the same goes for FPUs.

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Re: HP ATX0300F1 REV. A PSU recapping question

Posted on 2024-05-20, 18:16

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by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

...Theres only 1 4700uF 10v cap that is bulging and I can see some leakage on it too. This doesn´t mean the others are still within specs. It´s probably just a matter of time, until other electrolytics in the secondary section fail. Better look if there are more caps of the same type / same …

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Re: FIC 486-PVT missing cap, BIOS

Posted on 2024-05-20, 13:59

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

FIC generally use 220µF or 470µF in this position, but according to the datasheet of the LM2576T more is better. Best compromise is 1000µF16V or if your CPU is a less powerhungry type, 470µF 25V. EEPROM is 128K x 8 as printed on the mainboard. Any 128 KB Winbond or SST is perfect (like the common …

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Re: FIC PA-2005 motherboard(v1.3) (non-user cache upgrade)

Posted on 2024-05-20, 07:16

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I always used a 4-chip 32Kx32 setup for 512K so far. I never cared if and how the A15 pins of the chips are wired and weather they are connected to the chipset. On the silkscreen printing the 4 positions are marked "32K x 32", but that doesn´t necessarily mean 64Kx32 chips are not supported - at …

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Re: Late era 486 build

Posted on 2024-05-19, 14:30

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does the little heatsink south of the CPU get hot during operation? If you have access to a multimeter, check the voltage at this heatsink.

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Re: FIC PA-2005 motherboard(v1.3) (non-user cache upgrade)

Posted on 2024-05-19, 07:00

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For a 512K configuration you must move R162 (0 ohm) to position R161 for connecting A13 of the TAG chip to the chipset and R148 (0 ohm) to position R147 for connecting CA 18 = Pin34 of the C585VP to the cache chips. pa_2005_512Ka.JPG For 1M cache you will also have to connect address line A14 of the …

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Re: DFI K6XV3+/66 L2 and K6BV3+/66 L2 cache upgrade

Posted on 2024-05-17, 04:44

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can find a good summary here (using Google translator if needed): https://www.udo-richter.de/DFI/

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Re: Need some recapping advice on selecting the right capacitors. The non-standard specs. Low-ESR, coupling, decoupling

Posted on 2024-05-17, 04:41

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

To find the best solution for your specific mainboard you should provide the mainboard manufacturer, mainboard model and a high resolution picture. Since most manufacturers knew what they were doing it´s gernerally a good idea to start with checking the exact brand and series of the original …

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Re: FIC PA-2005 motherboard(v1.3) (non-user cache upgrade)

Posted on 2024-05-15, 05:36

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I can tell you the jumpering for 512K, I upgraded two of my PA-2005 a while ago. I never bothered trying 1MB because I usually don´t need 256MB RAM on mainboards like this. You should also populate Jumper "CLK3" and try if 75 MHz FSB runs stable. In most cases it does.

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Re: Ideas on dead hard drive

Posted on 2024-05-09, 15:44

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If measured while soldered on the PCB it´s not unusual that a 1MOhm resistor is measured as 0.74MOhm due to the other (parallel) components in the circuit.

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Re: Fixing an ASUS CM-1 256KB COAST Module Rev 1.3

Posted on 2024-05-09, 13:09

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

220 -> 22R

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Re: Fixing a Keyboard controller error on a socket 7 motherboard

Posted on 2024-05-09, 11:33

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After messing around with the PS2 mouse pins, I would replace the two external inverters at pins 23 and 24 first. They are probably part of some 14-pin DIP circuit between the ISA slots or some SOP package near the KBC.

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Re: Shuttle HOT-409 - boot loop

Posted on 2024-05-08, 17:23

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Three ISA slots are discoloured, so there has been severe battery lerakage and damage going on. I bet there´s still some interrupted traces or vias.

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