Re: Did I kill AWE64 Gold or did it die by itself?

Posted on 2018-08-07, 17:07

by

by SSTV2

in Marvin \ Sound

in Marvin \ Sound

Okay, removed faulty IC and now negative voltage regulator outputs proper -5 volts. Going to test that quad OP amp IC, maybe just one of the amps had failed. Also, I could not find mixers datasheet or pinout, thus I do not know where exactly OP amp connects and what purpose it has in circuit. Could …

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Re: Gravis UltraSound : Classic Found With Open Traces

Posted on 2018-08-07, 13:04

by

by SSTV2

in Marvin \ Sound

in Marvin \ Sound

#1 is there a chance the chips were untouched by the extra voltage? #2 Once the Traces are bridged, is there a chance I will damage a motherboard that I will test this card in? 1. There was no extra voltage; 2. +5V rail traces would burn in different locations on the sound card. Something is dead- …

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Re: Unidentifiable 8 bit ISA card

Posted on 2018-08-07, 00:11

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, it must be of industrial descent and it's definitely serial with only one data pin used on ISA bus. It probably uses RS422 or 485 protocols. Forgot to add keywords: Gearbox DD 8602.5/1A, DatorDesign, Data Design, Dator Design, DD C701 TC17G022AT. If anyone outside Vogons knows what this card …

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Did I kill AWE64 Gold or did it die by itself?

Posted on 2018-08-06, 23:49

by

by SSTV2

in Marvin \ Sound

in Marvin \ Sound

Not too long ago, I got a working sample of AWE64 Gold (CT4540), which I've decided to test today more thoroughly. Installed card into the P1 MMX system with Win95C and tried to test all available MIDI synthesizers under the MIDI tab in Multimedia settings, with MIDI file playing in the background. …

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Unidentifiable 8 bit ISA card

Posted on 2018-08-05, 17:51

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I cannot identify this card, it doesn't even look like a typical computer card, because it has very few pads on edge connector. It uses only 1 data, 10 address, AEN, clock and /IOW signals, it also supposed to have 2 DB9 connectors. ICs on card tell very little about its possible functions, it got …

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Re: QDI Advance 10T component missing (HELP!)

Posted on 2018-08-01, 12:47

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Brown - 100nf, white - 10nf.

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Re: ASUS PVI-486SP3 problems with L2 (external) cache

Posted on 2018-07-22, 17:19

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, buffers dying on themselves would be an unusual case, but possible. I've never encountered such problem myself personally, just curious if others did 😀

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Re: Pentium 3 Xeon slot 1 mod?

Posted on 2018-07-21, 17:54

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Never had those CPUs and never bothered to research if that's possible, but if PIII Xeon architecture is the same as of PII/PIII then it should be possible. Compare "pin-out" of both Xeon PIII and Coppermine PIII Slot1, if signal descriptions match - it can be converted directly, if not, some …

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Re: ASUS PVI-486SP3 problems with L2 (external) cache

Posted on 2018-07-21, 17:37

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I assume that you've tested SRAM ICs in another motherboard and confirmed that they are OK. If it's so, then you should follow Roman555's advice and try to gently push pins on chipset ICs with a needle, for possibly cold-soldered pins, test if jumpers are actually shorting headers and look for PCB …

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Re: Texas Instruments TACT84500 EISA chipset for 486 systems

Posted on 2018-07-21, 17:19

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

332 bucks for a 486 AT motherboard... What are they thinking!? I'm not that desperate. On a spare time, I'll filter out all motherboards that could potentially use TI TACT chipset by the help of TH99. If I won't find a single BIOS image from the MB list, I'll try to seek help elsewhere. I find it …

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Re: Voodoo-3 Evil King Pro Repair

Posted on 2018-07-18, 21:03

by

by SSTV2

in Marvin \ Video

in Marvin \ Video

Maybe you should leave those cards for the future repair, because anyone, at least somewhat experienced in electronics, can clearly see that you don't have enough experience in this field and had never reflowed BGAs the proper way. Learning to do that on rare PCI V3s is not the best idea.

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Re: Texas Instruments TACT84500 EISA chipset for 486 systems

Posted on 2018-07-16, 21:08

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Amazing! Thank you so much for the effort and time you spent while looking up that information! Prior creating this thread, I had already seen most of the info you have provided here, except for the actual computer systems, that used TACT84500 chipset. Now, word to the wise, these systems were based …

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Texas Instruments TACT84500 EISA chipset for 486 systems

Posted on 2018-07-15, 17:42

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Has anyone heard about this chipset or know specific systems that used it? It seems as it never existed while trying to find any information about it, no documentation, articles in old PC magazines or datasheets. This was the only mention of it I could find, "announced" column, 3rd paragraph: …

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Re: Need help repairing a Radeon 9800pro

Posted on 2018-07-14, 12:36

by

by SSTV2

in Marvin \ Video

in Marvin \ Video

WVII part doesn't exist in sot-23 package, it's probably a WV4 which would be a dual schottky diode. Here's the datasheet to that PWM: http://pdf.datasheetcatalog.com/datasheet2/2/045w6qsry74ax1h6ddqrwtxr403y.pdf In pg. 2, D1 and D2 are bootstrap diodes, see if traces either from pin 3 or 25 lead to …

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Re: Did I damage My Voodoo Banshee PCB

Posted on 2018-07-13, 20:20

by

by SSTV2

in Marvin \ Video

in Marvin \ Video

You didn't get the joke, oh well :( my questions is if any of the tracks around the silicone GPU dye are broken will this render it faulty? Not necessarily, some of them might be unused (NC) or could be few of many VCCs or VDDs, no one will be able to tell you what exacly got damaged. It would be …

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Re: Cheapest way to erase an eeprom ?

Posted on 2018-07-13, 20:02

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Cheapest way? All you need to be able to shunt charge from floating gate mosfets in eprom is UV (C spectrum) light, which is produced by germicidal lamps. Some ancient kitchen steam collectors used to have those, or you could google your local hardware stores for 4 or 6W standalone germicidal UV …

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Re: Did I damage My Voodoo Banshee PCB

Posted on 2018-07-13, 19:43

by

by SSTV2

in Marvin \ Video

in Marvin \ Video

On GPU: second row, last word - you're getting it for what you have done. In all seriousness, if trace got damaged before via - it's a damage and if after via - it doesn't matter.

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Re: Need help repairing a Radeon 9800pro

Posted on 2018-07-13, 14:01

by

by SSTV2

in Marvin \ Video

in Marvin \ Video

Judging by the massive ferite chokes and mostfet count, you probably have a R9800XT there. Missing cap should be just a bypass cap between 3.3 and 10uF (any of them in that range would do the job) and diode is probably a dual schottky which is used for bootstrapping. Use a DMM and PWM ICs datasheet …

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Re: Trying to save a Voodoo3 from death

Posted on 2018-07-06, 19:57

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

He said on DOS it works but when windows starts.. it gives a black screen. Have you at least tested that card yourself? Missing bypass capacitor should not cause such issues, but if you insist, just reduce cards clock freq. down to 100MHz or lower to test whether cap is the cause (caps value should …

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Re: Think I broke my Biostar MB-8433UUD-A

Posted on 2018-07-06, 19:06

by

by SSTV2

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is wrong, on so many levels. You must have at least desoldering pump with heater for that sort of soldering to be possible.

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