Ok, I will swap out the PSU and check if that changes anything. Thanks all for the suggestions! Will check back and report.

The SB Pro at least needs -5v to function, so check that rail on the PSU. -10v seems kinda weird, nothing would be generating that from the PSU, so perhaps you have a general issue with the negative voltage rails Thanks for that tip. How do I check that, exactly? The main powersupply plug that goes …

kixs wrote on 2021-11-29, 21:30: Images don't work. Fixed that, thanks.

Hi there, I put together a 486 for DOS gaming. Specs are as follows: Mitac board, IH4077D. Efar chipset. 486 DX4 100Mhz (33X3) As shown by the CPU check tool. SB PRO2 CT1600 3com NIC, for WIn3.11 networking. Mainly for ftp'ing tools/games/drivers to the 486. Added a battery (cmos) to keep bios …

I tried the diagnostics tools you posted. I'm starting to believe my soundcard may be dead or somehow incompatible with this system. When running the diagnostics or hardware config tools, I just get this response back: "Soundcard not found!" I tried another ISA slot, same thing. Maybe I should check …

Good info! Thanks :) I myself am currently trying to setup a similar card, in a 486SX with a Phoenix bios on DOS 6.2 and Win 3.1. Mine is an Aztech sound audio PC 16-bit ISA, found in HP's: HP p/n 5064-2620 D5182-63001 . Using the AZT2320 chip. It is supposedly SBpro II compatible. I tried the DOS …