So things are getting more interesting here.
When inserting the card as-is, POST fails as in *no video signal*, no beep, nothing. For all intents and purposes, completely dead.
The card seems to be a "museum piece"; it even came with a paper label on a thread. And the BIOS chips look like they're mounted the wrong way - the "hole" at the end of the chips were facing the opposite way of the corresponding "hole" in the sockets.
If I turn the chips around, I get a series of slow, varying pitch beeps (but no video). So either the chips have been permanently damaged by being inserted the wrong way before, or they're in the wrong way now. It's kinda hard to know. Removing the chips completely lets the system POST, but that's clearly not a workable situation.
I can also mention that the onboard 286 CPU does warm up a bit fairly soon after power has been applied. Not scolding hot or anything, but clearly it's being powered.
darry wrote on 2021-07-27, 16:45:
Is there another onboard or slotted IDE controller in that setup ?
No, I've removed that (and disabled the IDE controller on the GUS Extreme also installed.
Robin4 wrote on 2021-07-28, 00:55:
Sometimes its good to remove the rom chips.. And cleaning the IC socket underneath it with deoxit d5. And place the roms back.
Yeah, I have some contact/electronic cleaner (CRC) so I'll be trying that. But the mystery of the chip orientation remains.
/Eirik
The Floppy Museum - on a floppy, on a 286: http://floppy.museum
286-24/4MB/ET4kW32/GUS+SBPro2
386DX-40/20MB/CL5434 ISA/GUSExtreme
486BL-100/32MB/ET4kW32p VLB/GUSPnP/AWELegacy
~ love over gold ~