Well I didn't had access to the variety of sound hardware. ES1868 was my first and only ISA sound card, and I had a generic desktop motherboard without onboard peripherals. I simply didn't know and couldn't care less :) But it's good to remember there are always details you missed, thanks for …

The title has OPL3 mentioned, and es1868 has fully compatible implementation onboard. The app should work with any opl3-enabled card. The port 388h is the Adlib port, not OPL3. The card with OPL3 will also respond on that port for compatibility reasons, but that's not the primary port to access all …

Here's small prog I did write back then in 90'ties for use with my ess1868. It's hardcoded for port address 220h, I didn't need any flexibility back then. Edit the asm and recompile with TASM if your setup differs 😀

The dos only can use what card provides via bios (interrupt 10h services) and VESA bios extensions (univbe-like programs will know multiple cards and their capabilities), and that's it. The rest has to be compatible with something very standard - VGA/EGA/CGA, etc. So DOS doesn't know and doesn't …

The "Medicat-System" label is likely has nothing to do with the medical stuff. It looks like a typical sticker put by a reseller company to track the warranty period. Do you have one of those POST-cards to see the bios current activity? Might help in identifying problem.

Had a chance to work on a Tomato TD60C motherboard (Harris CS80C286-20 CPU, Citygate D90-272 for chipset) that had a battery leak. The corrosion ate away one pcb trace for keyboard clock line, and destroyed one pin on the onboard dram chip. Some soaking in the vinegar, cleaning with IPA, a bit of …