Hey, I've got some jumper settings for Prime 2C. Hope this helps.

Thank you!

The cards in my gallery are jumpered to the default settings.

Maybe the winbonds are jumpered default to a different ide adress, and therefore a 286 bios does not find any ide controller attached at its different adress.

JaNoZ wrote:

Maybe the winbonds are jumpered default to a different ide adress, and therefore a 286 bios does not find any ide controller attached at its different adress.

That's possible, but where do I start 😀

Just a few days ago I discovered my Winbond I/O controller "died". It worked fine 10 month ago. Now it also gives error about FDD and/or HDD controller at POST. 🙁

I remember frying up a floppy controller (it was a Winbond VLB card) in my 486. I forgot that I was making a backup (using a QIC80 tape drive) and wrote some data to a floppy at the same time.

After that, the floppy controller showed errors every time the computer was cold, but it worked after some time warming up. Maybe some of your cards needs some warming (or not).

Not a single Winbond card work...

Very odd and too specific to be faulty cards. I'm missing some crucial jumper setting or other bit of key knowledge.

Hi Phil,
do you remember if in the end you were able to make the winbond cards work?
I'm thinking about getting one for my 486 but after reading this thread I'm not very sure ...

I have to say I had similar results with a couple of these. I used hours to check everything, but there were these 2 card that I couldn't get to work no matter what I tried. Same problem with POST giving FDD/HDD errors.

And did you also have others Winbond cards that worked? Or just these two?

The question is if these Winbonds are extremely easy to die or they don't work on some systems...

Mau1wurf1977 wrote on 2013-12-03, 12:03:

Got a bunch of ISA controller cards and encountering something weird. The GoldStar (5 cards) and UMC (2 cards) cards all work, but NONE of the Winbond cards.
Cards not working (FDD POST error)

I have the same card and cannot boot from it. (have not tried floppy).
I found the Jumper settings here: https://stason.org/TULARC/pc/hard-disk-floppy … -KING-PUZZ.html

All I can say is the Winbond "W83757F/AF" chips die very very often. I just replaced 3 of them on 3 different mainboards.
New old stock W83757 are nearly impossible to find today and I think I know why...