Re: KT7A missing IC

Posted on 2023-11-03, 16:17

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Clock and Data should both be pulled to +5 through a resistor. So perhaps noise on the data line is the resistor becoming disconnected, leaving it either floating or connected to Ground when it's being driven. Might be worth checking the solder joints on the couple of resistor packs near the PS/2 …

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Re: KT7A missing IC

Posted on 2023-10-30, 11:55

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any chance it could be fuse related? There are a couple of what look like PTC fuses by the PS/2 ports that will trip if they warm up, then reset as they cool down. I assume they're either on the +5 or Gnd for the two ports. Might be worth a bit of testing and pointing a fan at them?

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Re: Freeway FWD-P3C4XD

Posted on 2023-10-27, 09:51

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not after a quick look, but are you sure that's the right BIOS? Looks like the P3C4XD and P3C4X have a different Southbridge (82C686A vs. 82C596B) so I don't know if it'd work. I know you've got the manual now, but would you mind still taking some photos of the board for theretroweb? The one there …

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Re: Insufficient power delivery on the Asus TX97 Socket 7 board?

Posted on 2023-10-27, 09:03

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some possible discussion of a voltage problem with dual-voltage CPUs here: ASUS TX97-X dualplane CPU's wont work ! and Re: ASUS TX97-XE (V3.x) and AMD K6-2/366AFR 366MHz

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Re: Freeway FWD-P3C4XD

Posted on 2023-10-27, 08:39

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you take a reasonably high resolution photo of the whole board (front and back if possible) and of the area around the connector? I haven't been able to find the manual anywhere but it might be possible to work out what goes where. I did find a reference to a Japanese manual with the filename m_ …

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Re: New motherboard, no branding

Posted on 2023-10-24, 13:58

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Probably won't give any more information that you've already got, but if you can make a note of the BIOS string when the machine boots then you might be able to look up a manufacturer code: https://www.dosdays.co.uk/topics/mobo_ident.php

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Re: What was the first motherboard with built in USB Support?

Posted on 2023-10-20, 16:22

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

When I had a look at a couple of the manuals for boards that had USB headers and the Apollo VP / vt82c586 chipset then they said that USB support would be added later, but that never seems to have happened. From the sounds of it both Intel and Via had buggy first attempts at getting USB working. …

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Re: Looking for a floppy drive cable with an edge connector that is not keyed

Posted on 2023-10-20, 14:49

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Would it work just cutting the keying out from a keyed connector? Or add your own connector to an existing cable (searching for '34 way idc card edge connector' seems to give a few options)?

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Re: What was the first motherboard with built in USB Support?

Posted on 2023-10-19, 20:51

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm not sure if the Apollo VP chipset / VT82C586 Southbridge ever had working USB support, even if boards had the header. There was a thread a while back ( https://www.vogons.org/viewtopic.php?p=1000492#p1000492 ) and I had a quick look then at a couple of other VP boards and they had the same sort …

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Re: ICW42c07-01P vs AV9107-05 - 386 motherboards repair

Posted on 2023-10-16, 14:06

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this it: https://www.datasheetarchive.com/datasheet?id=b4fc0d10228d77dda3c6478f36dc434ee1eabd&type=O&term=42c07 Looks very similar to this: https://www.datasheetarchive.com/datasheet?id=ea22d313e53f6e143efd66d608908e5611f619&type=O&term=av9107-05 But Ive only skimmed both sheets. [edit: in fact …

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Re: Microsoft PS/2 to serial pinout?

Posted on 2023-10-10, 21:26

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Huh, different again from the pinout I got working. Now I'm wondering if this was yet another design, or if I just got somehow lucky. I didn't use DB9 pin 6 at all, maybe it's used as some sort of loopback for the driver? Although Win98 auto-detected the mouse fine with how I wired it up. And I …

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Re: Microsoft PS/2 to serial pinout?

Posted on 2023-10-10, 15:33

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Huh, different again from the pinout I got working. Now I'm wondering if this was yet another design, or if I just got somehow lucky. I didn't use DB9 pin 6 at all, maybe it's used as some sort of loopback for the driver? Although Win98 auto-detected the mouse fine with how I wired it up. And I …

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Re: KT7A missing IC

Posted on 2023-10-10, 15:23

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the top line is the important bit: https://www.vishay.com/docs/72762/partmarkinfoso8.pdf So it has: Part Number Lot Code Factory/Year/Week/Wafer Thanks for checking that Abit hadn't changed that bit of their design going from the KA7 to the KT7. Thanks also to Theseim for checking on that …

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Re: KT7A missing IC

Posted on 2023-10-07, 15:31

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Memory says it's dual p/n-fet, for switching the RAM power supply from the main 3.3V to a 3.3V supplied by the +5VSB for when using sleep mode. I know that's not much help just now, but if no one has a chance to have a look then it should be possible to work out a component that'll work. Is there a …

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Re: Looking for Final BIOS for Gateway TB3 700

Posted on 2023-10-04, 21:59

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you downloaded the one from theretroweb then it's probably the generic Intel BIOS. Searching for the filename 7508736.exe from the Internet Archive record of the Gateway website led to http://vogonsdrivers.com/getfile.php?fileid=1473&menustate=0 which might get the Gateway banner back.

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Re: Looking for Final BIOS for Gateway TB3 700

Posted on 2023-10-04, 11:03

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this the one?: https://web.archive.org/web/20010413160224/ht … /4w4sb0x0.shtml https://theretroweb.com/motherboards/s/intel- … rings#downloads You should see the string 4W4SB0X0 somewhere on the screen when it boots.

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Re: Help with a Gigabyte GA-5AA rev 2.2

Posted on 2023-09-25, 09:14

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just wondering, but is 55 ohms actually a problem? That's only going to be a few 10s of mA, which might just be leakage currents. It doesn't sound like a metal-metal short. Anyone know what would be an expected value would be on this board? I've got a vague memory of measuring resistances on a …

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Re: Radeon 9600XT strange blue pixels

Posted on 2023-09-15, 12:19

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

you could try underclocking the card, both core and ram all the way down Downloaded ATI Tray Tools, underclocked to the lowest value, but nothing changed. Even run the benchmark for artifact but shows nothing. that leaves -gpu chip failed internally -radeons keep framebuffer in fixed memory …

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Re: Panasonic CDROM not spinning up - read head problem?

Posted on 2023-09-14, 18:41

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ahahahah! Well, this turned in to one of those projects of completely irrational stubbornness. There now follows a suitably long screed, the short version of which is that it's possible, with likely way too much effort, to use the reasonably available SF-C93 read head in the CR562b drive, which may …

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Re: Radeon 9600XT strange blue pixels

Posted on 2023-09-14, 13:18

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any chance of trying some other OS? It might be possible to boot linux from a live CD. If the missing red value is still there then it's probably a weird hardware issue (some sort of internal palette mapping?).

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