giantclam wrote on 2023-09-15, 04:18:

https://imgur.com/WcAoNc8.png […]
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This is a signal going to the GPIO, which tells the south bridge that it needs to process the shutdown through the APM/ACPI.
With such a very high quality connector, only 3 amperes are allowed per 1 pin, for 10 amperes you already need at least 5 of them.
https://elektrotanya.com/jetway_j-618tas_rev_ … ownload.html#dl
page 33
The schemes are generally simple and quite accessible, this is not rocket science. A modern router with DDR3/2.5Gbit/USB3 and AX Wi-Fi is much more complicated.

Nexxen wrote on 2023-09-14, 22:25:

PcBytes wrote on 2023-09-14, 22:03:

What I'd check would be the caps. Those are 20+ years old caps.

Nope, that's 20+ years of LOW QUALITY caps... nuance there not negligeable 😀
This is PCChips level, good it didn't blow in his face straight off.

While that Fortemedia soundchip isn't really what I'd call quality, Shuttle's AT implementation of 370 is far better than most PCChips mainboards. I wonder if the HOT-685 doesn't support Coppermines with some modding.

PcBytes wrote on 2023-09-15, 09:16:

Nexxen wrote on 2023-09-14, 22:25:

PcBytes wrote on 2023-09-14, 22:03:

What I'd check would be the caps. Those are 20+ years old caps.

Nope, that's 20+ years of LOW QUALITY caps... nuance there not negligeable 😀
This is PCChips level, good it didn't blow in his face straight off.

While that Fortemedia soundchip isn't really what I'd call quality, Shuttle's AT implementation of 370 is far better than most PCChips mainboards. I wonder if the HOT-685 doesn't support Coppermines with some modding.

That was from my experience with 3 Shuttle boards, they all sucked on capacitors' side.
Any way I'm pretty sure this board is close to coming back to life.

In my country it was an interesting option, AT P-II bundles, but m/b + ram + cpu wasn't that cheap still.
At least you saved on case and PSU.
It was long ago 😀

Nexxen wrote on 2023-09-15, 11:19:

That was from my experience with 3 Shuttle boards, they all sucked on capacitors' side. Any way I'm pretty sure this board is cl […]
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PcBytes wrote on 2023-09-15, 09:16:

Nexxen wrote on 2023-09-14, 22:25:

Nope, that's 20+ years of LOW QUALITY caps... nuance there not negligeable 😀
This is PCChips level, good it didn't blow in his face straight off.

While that Fortemedia soundchip isn't really what I'd call quality, Shuttle's AT implementation of 370 is far better than most PCChips mainboards. I wonder if the HOT-685 doesn't support Coppermines with some modding.

That was from my experience with 3 Shuttle boards, they all sucked on capacitors' side.
Any way I'm pretty sure this board is close to coming back to life.

In my country it was an interesting option, AT P-II bundles, but m/b + ram + cpu wasn't that cheap still.
At least you saved on case and PSU.
It was long ago 😀

Nahh, EPoX by far were way worse in cap quality than Shuttle 🤣

IIRC I had a lot of boards from my aunt's husband's workplace, among which were an EPoX EP-BX3, an MSI 6199VA, Shuttle AV61, a bunch of pretty sad looking Aopen AP5VM (only 1 out of 3 was complete enough component wise and it booted to my surprise, had a Winchip in it), PCChips M577 and an Acorp 6VIA81P.

Out of the Slot 1 boards, EPoX had spilled cap guts, so did the MSI, with the sole survivors being AV61 and the Acorp.
From what I remember, the Shuttle board had some IQ caps which I later found out were renamed OSTs.
The Acorp had Teapos, MSI had Chhsi (which I hope NOBODY ever has to inhale their putrid smell when removing them from the board) and the EPoX was FULL (every single cap) of GSCs.

Hence why the Shuttle, despite having dried caps, were at least better than MSI or EPoX.

Then there's Canicons on LuckyTech, Tayeh on Luckystar and ABIT (LuckyTech and LuckyStar are different companies) and IIRC Wendell on some pre-P4 era Soyos. (I said some because while my 6BA+IV came with Wendells, I had a older SY-5EMM come with I.Q. caps)

PcBytes wrote on 2023-09-15, 11:38:

Nahh, EPoX by far were way worse in cap quality than Shuttle lol […]
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Nexxen wrote on 2023-09-15, 11:19:

That was from my experience with 3 Shuttle boards, they all sucked on capacitors' side. Any way I'm pretty sure this board is cl […]
Show full quote

PcBytes wrote on 2023-09-15, 09:16:

While that Fortemedia soundchip isn't really what I'd call quality, Shuttle's AT implementation of 370 is far better than most PCChips mainboards. I wonder if the HOT-685 doesn't support Coppermines with some modding.

That was from my experience with 3 Shuttle boards, they all sucked on capacitors' side.
Any way I'm pretty sure this board is close to coming back to life.

In my country it was an interesting option, AT P-II bundles, but m/b + ram + cpu wasn't that cheap still.
At least you saved on case and PSU.
It was long ago 😀

Nahh, EPoX by far were way worse in cap quality than Shuttle 🤣

IIRC I had a lot of boards from my aunt's husband's workplace, among which were an EPoX EP-BX3, an MSI 6199VA, Shuttle AV61, a bunch of pretty sad looking Aopen AP5VM (only 1 out of 3 was complete enough component wise and it booted to my surprise, had a Winchip in it), PCChips M577 and an Acorp 6VIA81P.

Out of the Slot 1 boards, EPoX had spilled cap guts, so did the MSI, with the sole survivors being AV61 and the Acorp.
From what I remember, the Shuttle board had some IQ caps which I later found out were renamed OSTs.
The Acorp had Teapos, MSI had Chhsi (which I hope NOBODY ever has to inhale their putrid smell when removing them from the board) and the EPoX was FULL (every single cap) of GSCs.

Hence why the Shuttle, despite having dried caps, were at least better than MSI or EPoX.

Then there's Canicons on LuckyTech, Tayeh on Luckystar and ABIT (LuckyTech and LuckyStar are different companies) and IIRC Wendell on some pre-P4 era Soyos. (I said some because while my 6BA+IV came with Wendells, I had a older SY-5EMM come with I.Q. caps)

No wonder forums were full of "instability" threads. This is a battlefield 🤣
2000's era motherboards I have ALL had caps issues, but not the usual Nichicon and alike. Those are still strong after 20+ years.

These are starting to pile up as "old times stories"... Wasn't all fun and wonder back then. 😀

shevalier wrote:

Yep, i.e. CUBX-L. :-) There not solder DC/DC and has 4 solder wire from ATX rail to matherboard 3.3V. Rumors that there are some […]
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shamino wrote on 2023-09-14, 21:24:

Some dual power boards do in fact draw power from the 3.3V pins of the ATX connector, and they don't all even need a jumper to do it.

Yep, i.e. CUBX-L. 😀
There not solder DC/DC and has 4 solder wire from ATX rail to matherboard 3.3V.
Rumors that there are some special boards that determine everything themselves and switch the power supply are urban legends.
Nowadays, many motherboard schematics have leaked online. Everything is much more boring and banal, alas.

Late revisions of the Tyan S1590 do the same thing - ATX 3.3V is connected to the onboard 3.3V rail. Older revisions used jumpers, late revisions have it soldered. I use an ATX PSU with that board for that exact reason.
I don't know what legends you're referring to, but I think we agree.
*Depending on the design of the motherboard*, using an ATX power supply might relieve pressure on the 3.3V supply on the board and allow problematic AGP cards to work better.