Re: Inside the AST Ascentia 950N P54c/75 Css10

Posted on 2024-02-28, 09:31

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have 3 of these and all of them share common issues: brittle plastics power on / off issues random shutdowns PCB with lots of bodge wires (unclear if it was delivered to customer by AST this way, or if this was the result of a repair). Have different motherboards with different patches applied. …

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Re: Consequences of accidentally shorting a mosfet

Posted on 2024-02-20, 18:54

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another thing that can get damaged by passing 12V other than CPU and chipset are all downstream capacitors. I can only find revision 7 diagram. Its cost optimized, simplified Cpu VRM is on page 30. First thing I would do is lift L23 L24, put CPU back in and check resistance on CPU_Vcore - this …

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Re: Consequences of accidentally shorting a mosfet

Posted on 2024-02-20, 18:51

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thx everyone for the responses. much appreciated. So if I understand correctly : You need a load to verify the VRM (without a load I cannot measure anything). If the load is a shorted CPU it might cause damage to other components. If the load is a working CPU the CPU might be damaged due to the VRM. …

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Re: Consequences of accidentally shorting a mosfet

Posted on 2024-02-20, 13:51

by

by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Apologies for the stupid follow up questions. Not really familiar with all of this stuff. So I guess the high side mosfet is the one hooked up to the 12V rail (drain) , switching on/off at a high pace to apply a voltage to the inductor, allowing the inductor to output a suitable voltage to the CPU. …

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Consequences of accidentally shorting a mosfet

Posted on 2024-02-20, 11:17

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had an AMD Athlon board on my bench and I wanted to check the output voltage of the mosfet. While poking around with my multi-meter I accidentally shorted the drain and source. The machine shut down immediately and wouldn't start anymore. Now I have been careless in the past and have had this …

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Re: Does anyone know the jumper settings for a Mitac 286VE/Atari PC4?

Posted on 2022-01-19, 17:49

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I’m a couple of years late, but here you go 😀 https://www.atari-computermuseum.de/pc4m.htm Just got one myself 😀

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3D Mark 99 : Game 2 First Person : only 3fps with Riva128

Posted on 2021-09-25, 09:27

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by RetroSpector78

in Marvin \ Video

in Marvin \ Video

Hi, I am doing some benchmarking with my riva128 card, and noticed that although games like quake are running a lot faster than the ATI Rage Pro card I am replacing it with (almost doubling the performance), I did notice that the 3DMark99 score is very low. This is mostly due to the fact that Game 2 …

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-08-28, 11:08

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Good to hear and Good job ! Thx. And also thx for pointing out that there are in fact 2 D845 boards (The D845GEBV2 with video and the D845PESV without video). For those interested, I created a video about the problem (https://youtu.be/MpA_mSqa0r0) and the solution (https://youtu.be/0Z7LskUzFo8)

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-27, 11:17

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Horun wrote on 2021-07-27, 00:51: Good to hear and Good job ! Thx. And also thx for pointing out that there are in fact 2 D845 boards (The D845GEBV2 with video and the D845PESV without video).

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Re: Intel D845 splash screens

Posted on 2021-07-27, 08:32

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It seems easy enough to do (with the Splash utility) but without original artwork (BMP or USR) the results may disappoint, and there doesn't seem to be an obvious way to extract the content once its uploaded to the BIOS. The closest I could find online was this, and its already processed beyond the …

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Re: Intel D845 splash screens

Posted on 2021-07-27, 08:31

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

you can go back to the bios version with the logo and extract it putting it into the laatest release but they stopped boing it because of printing lag. yeah I did look a at the older bios versions but I used the Intel bootable BIOS update disks, and there they execute the iflash command headless …

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Re: Intel D845 splash screens

Posted on 2021-07-27, 08:30

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I stand corrected, the splash screen (USR) is located in the Intel BIOS downloads for the board (LOGODATA.USR) but the BIOS update bootdisk generated by the Intel tooling doesn't use it. If you run the iflash command interactively, you get a menu where you can update the user space with this USR …

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Re: Intel D845 splash screens

Posted on 2021-07-27, 08:01

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Will look around but appears your original BIOS was a retail board with it's original BIOS flashed by Intel. The BIOS upgrades on Intels webite usually were for both retail and OEM channels (who then added their own image like Compaq). Might be something in the old archives but adding an image to a …

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Intel D845 splash screens

Posted on 2021-07-27, 00:44

by

by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was dontated a Pentium 4 with an Intel D845PESV Desktop board that came with the following splash screen : 2021-07-22 22.56.15.jpg The PC came with BIOS ID SV84510A.86A.0008.P04 Now due to a corrupt BIOS leaving the machine in BIOS recovery mode without video output, I had to reflash the BIOS. I …

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-26, 21:37

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That looks bad. Have you followed the trace to see what points it communicates? that could give a clue about what went wrong, however with a broken trace in such way I'd bet on a short somewhere that might have damaged something more difficult to repair than a trace. Fixed the trace but I’m …

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-26, 13:34

by

by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did found this on the back of the motherboard so something probably failed. 2021-07-26 12.40.53.jpg I fixed the trace but same result ... black screen and floppy drive keeps asking for a floppy disk. I tried the Intel d845pesv BIOS image (P09-0017.BIO) on a formatted floppy but didn't work either.

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-25, 10:40

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Correct, I just double checked and my motherboard has its onboard video. I do not use it (have a Geforce 2 in use) but it's there. I remember back in the day there were some intel boards that used custom BIOS and OEM logos (I remember Gateway and maybe Dell?), and had different hardware …

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-25, 09:26

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hmmm, the Intel Tech Spec and Quick reference for the D845GEBV2 states onboard video and shows a VGA connector on back bottom next to the single serial port. Perhaps your board was an OEM version??? Nearly all the Intel 845G boards have onboard with a VGA output from all the Intel specs looked over …

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-24, 20:27

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I have that exact same motherboard working here, in case you need to test something. My suggestions would be the usual (maybe you already tried them): - Reset BIOS to default values (https://www.intel.com/content/www/us/en/support/articles/000005753/boards-and-kits/desktop-boards.html) - Try a …

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Re: Intel D845GEBV2 P4 motherboard goes in endless floppy boot loop without video

Posted on 2021-07-24, 20:03

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by RetroSpector78

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes if the FX5200 8x AGP is not a universal 1.5v/0.8v and runs at 0.8 volts only then you could have fried the card and the board, board specs say: AGP connector supporting 1x, 2x, 4x AGP cards (1.5v only).... So you get no video off the 845G video out or any PCI or other AGP card ? There is no …

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