Just to get back to you, I managed to run original dx2-50 with board jumpers set as if it was dx2-66, put a heat sink on it to make it more comfortable and it just works. Doom runs noticeably better. Thanks again!

If that's the case you could try and see if you can just run your original DX2-50 @33MHz FSB (i.e. with the settings for a DX2-66). This won't break anything either. Worst case your system won't be stable. By the way, does this mean that it was just a matter of binning process even back then? That …

Alright, will try to get my hands on one of those cables. Shout-out to everybody that chimed in. I appreciate you.

are you sure you don't have jumpers on your 3.5 floppy drive ? I can see some there. But are in difficult to reach place. Maybe they are not meant to be touched? Also found one source stating that: The cross-over of some of the wires in the floppy disk’s signals cable determines the drive’s …

The thing is, its nearly impossible to get my hands on 5.25" ms-dos floppies.

It seems to me that drive sel for A: and B: are specific pins on the connector. Maybe I could use something like these to swap those pins in between I/O card and cable itself?

Thank you!

@Jo22 Cool stuff, but I have no means of creating such 5.25 floppy. My only machine with such drive is this one, and right now can not boot into anything. Do not have any bootable 5.25 floppy, and ms-dos on C: got deleted in.. Well.. Space freeing accident - let's call it that.

This is the motherboard in the end. My former identification was incorrect. Please have a look again. But seems to me, that with this board configuration, it is even more straightforward.

@Disruptor No friends dabble in this kind of stuff. This is the C: HDD . This is the D: HDD . But was never set up properly. Could see only like 50MB of it. Battery is dead so I am using auto-detection in bios on every startup. Funny thing is I actually installed Windows 3.0 on D: prior to losing …

VgaCopy solution sounds great, but I don't have any other device to put anything on 5.25 floppy. And system also lacks any bootable drive. Maybe USB-SATA cable would do it? Just to put something bootable on C:?

I tried to disconnect 5.25 drive in hope that it would pick up 3.5 drive as A:, but did not work that way. Also thought of swapping cables, but they are different kinds. 3.5 looks like sata, but 5.25 uses another type of connector. Something that goes over pcb, not classic pins. Ending on 5.25 drive …

Hi, I am trying to install ms-dos on my 486 from 3.5" floppies. Currently there are drives: A: 5.25" floppy B: 3.5" floppy C: master HDD D: slave HDD In the bios I see only options to set boot order 'A: C:' and it gives me only option to change it to 'C: A:' Am I looking for some jumper on floppy …

@BitWrangler thanks for reply, not sure if I understood correctly. If I set jumpers to match intel 486dx2-66 bus and core speeds, it should be safe to stick st486-66 there? @Doornkaat thanks, I already ordered button style battery kit, friend has soldering station and we plan to make it right. The …

Hi, I dug up first pc (80486) I have ever touched (and yes, it fell on me once). It is still working! I have built few computers to this day, but I have very limited experience with tech this old. From the POST code I managed to identify motherboard . EDIT: This is the motherboard . My previous …