VOGONS


Reply 20 of 28, by BenWit

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HOLY CRAP
Now that is a discovery and thanks for it.
My unit has the same riser card (also with solider in TC4), so this is definitely going to be added high on my retrocomputing projects list. As well as a case mod to make it easier to change out the SD card boot drive.

Reply 22 of 28, by cyclone3d

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They are caps.

I just matched the physical size up. I have no idea what UF/V they were.

Yamaha YMF modified setupds and drivers
Yamaha XG resource repository - updated November 27, 2018
Yamaha YMF7x4 Guide
AW744L II - YMF744 - AOpen Cobra Sound Card - Install SB-Link Header
Epstein didn't kill himself

Reply 23 of 28, by WyndC

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cyclone3d wrote:

They are caps.

I just matched the physical size up. I have no idea what UF/V they were.

I can't PM yet, but Cyclone3d when I populated my board last night, the computer wouldn't boot at all with or without the sound card. Any chance I could pay you to populate mine? labor/materials/shipping I'm based out of MI.

Thanks.

Reply 24 of 28, by cyclone3d

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Yeah, I guess we could work something out.

Go ahead and post hi-res pics of the front and back so I can see if I see anything wrong first.

Yamaha YMF modified setupds and drivers
Yamaha XG resource repository - updated November 27, 2018
Yamaha YMF7x4 Guide
AW744L II - YMF744 - AOpen Cobra Sound Card - Install SB-Link Header
Epstein didn't kill himself

Reply 26 of 28, by cyclone3d

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franky52 wrote on 2019-12-07, 23:34:

I’m suffering from very low sound and with a lot of noise.

Does this fix solve both problems?

Yes, it fixes both problems.

Yamaha YMF modified setupds and drivers
Yamaha XG resource repository - updated November 27, 2018
Yamaha YMF7x4 Guide
AW744L II - YMF744 - AOpen Cobra Sound Card - Install SB-Link Header
Epstein didn't kill himself

Reply 27 of 28, by franky52

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cyclone3d wrote on 2020-01-23, 03:20:
franky52 wrote on 2019-12-07, 23:34:

I’m suffering from very low sound and with a lot of noise.

Does this fix solve both problems?

Yes, it fixes both problems.

Thank you. I will try to populate it.

Reply 28 of 28, by xjas

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cyclone3d wrote on 2018-12-02, 08:01:

I have figured out what the problem is with the AW744-L2 card and the HP T5720 thin client.

It is PCI bus noise.

Fully populating the capacitor places on the PCI riser card completely fixes the issue. I am guessing this will also fix issues with "compatibility" with other cards as well. It should also significantly clear up the audio output if you are using a different sound card.

So, I'm in the same boat here with my Fujitsu Futro S300. Neither my "Creative" CT4810 (AudioPCI) nor my AW840 / CMI8738/PCI-SX want to work with it (both cards are known good - actually the Creative DOS drivers init the card and upload the wavetable sample ROM sucessfully, but no sound output is to be heard. The CMI card just plain won't initialize.)

Fortunately the solder pads & holes are all nice and clean, but unfortunately, there's no published values for the caps anywhere. This is the riser:

riser.jpg
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riser.jpg
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Public domain

The part # on the riser is 736TR3230K100, incidentally, not that that helps much.

How can I determine the values of the needed caps? Anyone want to take an educated guess?

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