I just had a similar problem - dos 6.22 installed on a 500mb partition and was unable to create an extended partition, even though fdisk was showing full HDD as 8GB Instead of installing dos from the scratch with updated LBA settings, I just connected this HDD via ide-USB adapter, did backup (it …

Well sometimes you can spot things, like missing voltages, or proper reset signal, or just the sequence of codes - which might give you a clue of some sort. For example that the mobo thinks it has MDA adapter plugged in instead of CGA/EGA/VGA, due to a glitch in the VRAM detection code. AFAIK the …

Based on the 8 beeps. You could try cleaning the ISA slots with Isopropyl alcohol & a toothbrush. Reinsert the card multiple times. Try different slots. Also use a multimeter on all the traces near the battery, from start to finish. One of the vias on the top right of the board looks green/non …

Unfortunately there are some issues and the biggest mystery so far (but not a straight issue per se ) is that I have no idea what make and model this motherboard might be... Looks to be 386E-25MHz: https://theretroweb.com/motherboards/s/unknown-386e-25mhz Seems like it's very similar to 386WB I …

Hello fellow neckbeard tinkerers! I'm trying to bring back some life to this 386 motherboard with an AMD 386DX-25 onboard. Unfortunately there are some issues and the biggest mystery so far (but not a straight issue per se ) is that I have no idea what make and model this motherboard might be... …

(...) Did you check the actual Am486DX4-100 speed with a DOS tool? The early to mid 1994 BIOSes on these boards don’t support the Am486DX4 CPU (that’s why they are detected as 80486DX2) and may report the wrong speed as well. You can use my Chkcpu DOS utility to get an accurate speed reading. …

Horun wrote on 2022-05-30, 04:08: Good job ! Wonder why DFI went back to a VIA 82C486 in the VPP after using 82C496 in the VPA, VPB, VPC, etc Maybe because this one has no IDE and FDD controller onboard. While testing it never showed ‚No Floppy’ error, so that’s why I guess.

Work in progress, I made a new topic for it: DFI G486-VVP Motherboard manual... creating Jak to mówią, praca wre.

Hello everyone, it's my first post here, so I just want to say hi and that I really appreciate a place and people like you around here. OK, enough small talk, let's get to the topic. Some few months ago I have obtained (...found) a couple of complete and working 486 office PCs and one of them had …