Building a RIDICULOUSLY Overpowered DOS PC - Retro Rocket

Wanna run Kings Quest and Crysis on the same PC? No problem! // Your trustable pcb prototype partner : https://www.pcbway.com/

SD Card holder : https://www.amazon.co.uk/dp/B07TC2MF6R

Windows 98 auto-patcher : https://retrosystemsrevival.blogspot....

Hacked NVIDIA drivers : https://toogam.com/software/archive/d...

FastDOOM : https://github.com/viti95/FastDoom

I've tried the following things to get ISA soundcards working on Windows 98 :

* Updating motherboard BIOS (it was already latest, same error). (EDIT : tried some older BIOSes, same result)
* Disabling all unused hardware/ports/etc in BIOS and removing all hardware except graphics card (same error)
* Trying a few different AGP/PCI graphics cards in case it's a conflict there (same error)
* Enabling/Disabling ACPI, reinstalling windows each time (same error)
*  Enabling/Disabling "PNP OS Installed" in BIOS with ACPI disabled, reinstalling windows each time (same error)
* Trying various versions of the Via 4-in-1 chipset drivers (same error)
* Trying several versions of soundcard drivers (same error)
* Manually adding the soundcard in Add New Hardware so the "resources" tab appears - on next reboot I get two soundcards in device manager (both not working)
* Trying on Win95 instead (similar error, forget exact text)
* Trying DOS and even Windows XP instead of 9x on same motherboard (works perfectly)
* Testing both soundcards in other PCs with Win9x (works perfectly)