Native (WDM) HD Audio driver for Windows 98se/Me

[SweetLow]

VIA VT1708B 8-ch @ nVIDIA MCP78

Driver installed and loaded, but I got only errors on any device access (like general error).

WDM audio stack is working (I tested USB audio device).

[Deron416]

I tested your audio driver on WindowsMe installed on real hardware with Realtek ALC662 HDA on-board. The driver is installed without any problems as "WDM Sample Driver for HD Audio", the system boots and works fine but there is no sound in the speakers (tried all the audio jacks).

Anyway, thank you very much for your contribution to the win9x community

[Drew Hoffman]

It seems it is only working for the Realtek ALC2xx at this time, for other Realtek codecs it is not finding the correct output pathway. Will troubleshoot more when I have a chance.

If anyone here is getting a resource conflict at 0000-3FFF like mskrzynski, please try the latest version of Patcher9x released a few days ago to correct the above 4gb resources bug. https://github.com/JHRobotics/patcher9x/releases/tag/v0.9.91

 

[Drew Hoffman]

Here is version Alpha-013 which rearranges a lot of the codec init code and tries to init all the Line Outs no matter what. 

https://github.com/andrew-hoffman/WDMHDA/releases/tag/Alpha-013

My SFF with an ALC887 codec now produces some sound but it is garbled; small segments will keep looping until I do something that causes hard drive activity and then it will play a bit more into the buffer. It's possible that the interrupt is not firing or is being suppressed. The problematic system has most devices sharing IRQ 11. 

[Deron416]

With the Alpha-013 version, ALC662 produces sound, but, as in the case of the ALC887 codec, it is garbled.

[SweetLow]

On 1/7/2026 at 8:10 AM, Drew Hoffman said:

ALC887 codec now produces some sound but it is garbled; small segments will keep looping

The same is here. And sound is on Line In instead of Line Out.

On 1/7/2026 at 8:10 AM, Drew Hoffman said:

It's possible that the interrupt is not firing or is being suppressed. The problematic system has most devices sharing IRQ 11. 

Highly unlikely. As I said my first system with Realtek ALC236 has exactly the same config, but sounds good.

[MERCURY127]

yes, new build now prodice sounds on line out... garbled exactly as

On 1/7/2026 at 8:10 AM, Drew Hoffman said:

small segments will keep looping until I do something that causes hard drive activity and then it will play a bit more into the buffer.

i make some tests with SoundCheck (req KernelEx), and sometimes get slightly stuttered, almost pure sound, but this result was very unstable.