Re: [Experts] Asrock FM2A55M-DGS unknown broken component

Posted on 2020-05-19, 19:31

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, According to a boardview for a similar model the Q38 is a P-mosfet AP2309GN manuf. APEC Datasheet The purpose of this mosfet is to send +5VSB when the mainboard is turned off. The Q41 is N-mosfet and it does the same for +5V when the mainboard is turned on. They both are controlled by +12V on …

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Re: UMC8881/8886 Datasheet

Posted on 2020-05-17, 07:52

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes. UMC stuff are particularly hard to find. I'd be also interested in early ALI chipsets. The same story.... I suppose Mitac 4024 , Mitac 4023 (Chaplet Halikan NBD-486) based on ALI M1219. Is it early enough? There were a service manual for Mitac 4024 but now it's dificult to find. http://web. …

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Re: Chaintech 5TTM1 M201 and AMD K6 2+ ?

Posted on 2020-05-14, 14:45

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is a similar Chaintech mainboard that supports some K6-2 2.2v - Chaintech 5TTL. I don't know if the CPU core VRM is the same. There's a little chance that its BIOS can be compatible with 5TTM1. Trying to use an alien BIOS is dangerous for a CPU and a mainboard . An alien BIOS can brick a …

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Re: Chaintech 5TTM1 M201 and AMD K6 2+ ?

Posted on 2020-05-14, 12:58

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all, Will the Chaintech 5TTM1 M201 motherboard work with the AMD K6 2+ ? Hi I think it won't. It has "Jumperless CPU Setup". So the BIOS should know not only CPU init procedure but also manage to setup proper CPU core voltage. https://web.archive.org/web/20050211141427/http://www.chaintech.de/ …

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Re: UMC8881/8886 Datasheet

Posted on 2020-05-14, 11:20

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Still there are the ctchip config files that provide interesting data. Not a complete datasheet, but it seems that most populated registers are described (if this is what you are looking for). Those are useful, but what would also be really nice are the pinouts. I remember I have got a schematic …

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Re: Dead motherboard Intel MU440EX, any advise to fix it?

Posted on 2020-05-12, 14:02

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i gave it a last try, i was hoping that i needed a propietary power supply as my last hope, but if it has to work on any atx power supply...then im out of luck what a pain, might go to the trash bin *** Cga.8086 , it's too early to give up. Although you're sure that the PSU is OK try another one …

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Re: Dead motherboard Intel MU440EX, any advise to fix it?

Posted on 2020-05-11, 19:24

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CR2032 cmos battery can be dead. Check it or just swap to fresh one.

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Re: TNT2 M64 on Super 7 system - Worth it?

Posted on 2020-04-12, 13:57

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

gaffa2002, have you seen the manual? https://mbmanuals.retropc.se/manuals/424/V72ma-eng.pdf Try to find JP4 in order to disable IRQ for onboard graphics. I didn't find it on the jumper location picture though. Nvidia graphics demands IRQ, so JP1 should enable IRQ. Try BIOS settings: Primary Display …

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Re: Abit AN78GS

Posted on 2020-04-09, 09:26

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by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Recently I acquired an Abit AN78GS board I know for a fact that every CPU, module of RAM and video card I put in are good because I Tested them in other systems. Should I try with the integrated VGA? I was under the impression that internal VGA is automatically disabled when you put an external VGA …

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Re: VIA UniChrome Pro IGP vs Windows 98SE

Posted on 2020-01-19, 13:12

by

by Roman555

in Marvin \ Video

in Marvin \ Video

I would try another Windows 98. I mean there are OEM and Retail versions of Windows 98 se. Sometimes they give the same PnP device different range of i/o , addresses .

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Re: Welcome to the updated VOGONS

Posted on 2020-01-15, 20:02

by

by Roman555

in Milliways

in Milliways

I like new design but there are some inconveniences. For example, this topic lost imortant coloured fonts used as legend: LGA 775 Motherboards with AGP Slots P.S. Now I see new legend (numbers instead of colours). Thanks!

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Re: Asrock 775Dual VSTA & Core4Dual thread

Posted on 2020-01-13, 20:34

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have such a question, someone tried to find the possibility of working on this motherboard video cards with the pсi-express gene interface 3.0? Maybe contact the author of the modified bios and so on? It's not a modified bios in the usual sense. It's just a version of BIOS that was developed by …

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Re: BIOS Hotflash questions

Posted on 2019-12-11, 22:02

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's alright. It must be my biggest post here :-) The simpliest algorithm would be like that: Check if A17 pin30 of EEPROM is connected to the address bus signal Addr 17 -Turn off the motherboard completely (unplug the power cord) -Multimeter is turned into Diode Mode so when probes are connected …

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Re: MSI MS-6168 ... is a rebirth possible ?

Posted on 2019-12-09, 19:48

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The black probe - is ok. Now I understand. parhelia512, have you seen my picture with red arrows pointing where to measure voltage on the mainboard with the red probe ? https://www.vogons.org/viewtopic.php?f=46&t=70507&start=20#p806768 3.4V is input voltage for the regulator. Measurement of output …

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Re: BIOS Hotflash questions

Posted on 2019-12-09, 19:32

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

parhelia512, I hope you will not give up and finally the board will work :-) I downloaded and opened both BIOS (of course I mean the main awardbios module "original.tmp") in hex-viewer. I just don't understand how it can be. The text string "P6F91i PCI/AGP GREEN BIOS (1M)", you have mentioned, is …

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Re: MSI MS-6168 ... is a rebirth possible ?

Posted on 2019-12-09, 09:02

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

parhelia512, MOSFET has 3pin. Your circles don't clarify what pin exactly gives the value

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Re: BIOS Hotflash questions

Posted on 2019-12-09, 08:56

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all Today was a nightmare in my flashing tries... ... Finaly, trying with my last alive EEPROM, i flashed the 2MB BIOS using uniflash...and the Board Post ! I can access the BIOS, it correctly detects the hard drive and floppy but it says "Unknow Chip" (EEPROM) and the board reboots continually …

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Re: Help! My M571 Motheroard won't detect any PCI Cards.

Posted on 2019-12-05, 21:08

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's strange that the PCI post card works but other PCI devices don't work. I think the difference might be the POST card uses lower half of address/data bus AD[00]-AD[15] and doesn't use upper half AD[16]-AD[31] (pins 20-32).

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Re: MSI MS-6168 ... is a rebirth possible ?

Posted on 2019-12-05, 18:07

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

parhelia512 , no problem. I drew some arrows on the MB picture. It will help I suppose. Now you can measure voltage using voltmeter (DC mode, max 20V). The black probe - GND, the red probe - the arrow. The MB should be turned on. If there is difference in measurement on different stage of start (I …

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Re: BIOS Hotflash questions

Posted on 2019-12-04, 20:43

by

by Roman555

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

parhelia512 wrote: To add more details, i received the board without crystal an with a 1MB EEPROM. I think the EEPROM is dead : when i try to flash the 1MB BIOS, the flash utility say "Unknown Type" for the EEPROM. Maybe you tried to flash 1Mbit eeprom in mainboard that uses 2Mbit eeprom ...

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