Deunan wrote on 2024-05-21, 17:47: Damaged IDE cable or overclocked ISA could cause these problems. What exactly is this "486DX"? I have tried a new IDE cable in lieu of the original (several in fact.) It didn't seem to make a difference. I haven't considered an overclocked ISA. It's a Zeos 486dx.

Your HDD is hooked up to the primary IDE drive connector? Does the Bios show your HDD? Is one of the pins on the IDE connector on board bend flat perhaps? My HDD is hooked up to the primary IDE and bios does show the HDD. I have checked the pins on the IDE connector; all good there. The board is …

I added the diagram.

ux-3 wrote on 2024-05-21, 16:01: Ist the IO controller on board or seperate? Honestly, I'm not familiar with the IO Controller. Where is it at on the motherboard? Pretty much everything is on the board except the addition of the graphics, sound card, and ram that's inserted into the slots.

I am trying to get my Zeos 486dx up and running. It came with no hard drive. I have tried SD Card/IDE adapters, CF/IDE adapters, 2 working hard disks (1994)....all different size formats - 250mb, 512mb, 850mb, 1gb, 2gb (and others.) I can partition the drives from FDISK (SD and CF), but whenever I …

[/quote] It could be a related incompatibility, still. 286/386 and early 486 BIOSes did pre-date ATA-2 specification. ATA-2 did change some subtle things, which caused all sorts of little issues. In my case, it did hang a 286 PC during boot with a BIOS dated 1988. Using XTIDE Universal BIOS on a …

Yes ! What size real hard drives and what size CF have you tried ? Anything 512Mb or less should be ok no matter the 486 board/bios. I have tried multiple sizes - 250mb, 425mb, 512mb, 1.9gb, 800mb....all do the same things. On the SD Card it was 425, 512, and 2gb. On the CF it was 1.9gb. On this …

I made a post a couple weeks ago about getting a hard drive up and running for my Zeos 486dx. Long story short, I tried formatting an SD Card to Fat16 many times using the dos boot disk. I would be able to partition but it would give me errors when I needed to format it OR formatting it during a …

TLDR ; some old IDE controllers just don't like bigger drives. I am able to boot to the A Drive and start MSDOS installation. MSDOS says it needs to format the unallocated space for the installation. I only have the option to proceed, in which I do. After it gets to 100%, it gives me an error …

TLDR ; some old IDE controllers just don't like bigger drives. Problem: I formatted the SD card into FAT16 partitions of 2 gig each. Do you mean partitioned and then formatted? In this machine or another? Using what software? Bios was able to auto detect my hard disk as 1690mb. What size it it …

Just because the BIOS detects 1690MB doesn't mean it detected it correctly, especially if you are not using a 1690MB SD. What is the capacity of the SD that you are using? I'd recommend trying XTide Universal BIOS or EZ Drive 9.03 http://vogonsdrivers.com/getfile.php?fileid=1899&menustate=68,66 v9. …

I have a Zeos 486dx2 66MHz that I have been trying to get up and running. I had to replace a lot of the parts, including getting a new hard drive/disk. I ended up getting an IDE to SD card adapter. Problem: I formatted the SD card into FAT16 partitions of 2 gig each. Bios was able to auto detect my …