VOGONS


First post, by squareguy

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I just ordered a few AOpen Cobra YMF-744 sound cards on eBay knowing that they do not have the SB-Link header installed. I am planning on possibly using one on a new DirectX 7.0 build and I would like the SB-Link to work for late DOS games and just because.

It looks like the header (IDC 6-pin) and at least two SMD componets (capacitors and/or resistors) will need to be installed. Anyone done something similar or know the values of the missing components?

Here are the pics from the eBay auction

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Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 1 of 29, by cyclone3d

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Looking at one of my YMF724 cards, it looks like they should be number 103 which is 10k ohms for R49 and R50 on your card.

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 2 of 29, by squareguy

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Awesome, thanks!

Hopefully it's just those three parts

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 3 of 29, by gdjacobs

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You'll notice that the traces between the header and the YMF744 are intact, so those components are for pull up, pull down, or noise suppression.

All hail the Great Capacitor Brand Finder

Reply 4 of 29, by squareguy

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Well they arrive today and I should be able to get better pics by tomorrow.

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 5 of 29, by squareguy

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I am assuming this is a reference card design. If anyone has a YMF744 card that looks similar with the SB-Link and / or SPDIF installed please post some high-res pics. My searches have not yielded much.

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 7 of 29, by squareguy

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Thanks!

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 8 of 29, by SaxxonPike

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I guess my PCB isn't as similar as I'd thought.. here are some photos anyhow. Sorry they couldn't be more useful :s

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Above is the SPDIF header.

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Above is the PC/PCI header. The two components labeled R44 and R47 have "103" printed on them. Pins 92-94 on the 754 appear to have discrete connections to the header, but I can't tell which is which because they go underneath.

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The bottom side doesn't appear to have traces for this connector on this PCB.

Sound device guides:
Sound Blaster
Aztech
OPL3-SA

Reply 9 of 29, by squareguy

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SaxxonPike & cyclone3d

Well at least it confirms that the two resistors are 103 (10k-Ohm) from more than one source.

I think those are the only two missing componets other than the header. I will trace C16 on my board when it arrives to double check.

Thanks again! BTW how do you like that card and what do you use it for, if anything?

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 10 of 29, by SaxxonPike

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squareguy wrote:
SaxxonPike & cyclone3d […]
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SaxxonPike & cyclone3d

Well at least it confirms that the two resistors are 103 (10k-Ohm) from more than one source.

I think those are the only two missing componets other than the header. I will trace C16 on my board when it arrives to double check.

Thanks again! BTW how do you like that card and what do you use it for, if anything?

I'm still waiting on a replacement PlatiniX 7LI-A motherboard, which should contain a PC/PCI connector. They sent me the C variant, which lacks the PC/PCI connector. Ideally, I would test this card for my Pentium 4 DOS gaming article.

Currently, the card isn't being used for much of anything 😀

Sound device guides:
Sound Blaster
Aztech
OPL3-SA

Reply 11 of 29, by squareguy

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I will try and test soon. resistors check good though.

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Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 12 of 29, by squareguy

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I got a chance today to test it. Took a little bit to figure it out but working fine under pure DOS with S-IRQ and PC-PCI (SB-Link)

Pretty cool!

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 16 of 29, by Lawro

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squareguy wrote:

I got a chance today to test it. Took a little bit to figure it out but working fine under pure DOS with S-IRQ and PC-PCI (SB-Link)

Pretty cool!

I just got one of these, and am super interested in soldering on the header and resistors like you did.

I was wondering if you recall the power rating and tolerance of the 103s you used? I don't know much about that sort of stuff and don't want to use ones that'll break the card.

Reply 17 of 29, by squareguy

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I'll try to measure them and see what size they are, I have forgotten honestly.

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 18 of 29, by squareguy

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10k-Ohm 805 SMD Resistors

Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE

Reply 19 of 29, by vutt

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I'd like to thank you guys for this mod info. Now I have fully functional SB Pro in native DOS mode. I like this card very much in both win98 and DOS op.systems.

My rig: https://imgur.com/5LSXDcx