First post, by Steapa
Solved: This board (Zida 4DPS ver 2.1) does not support EDO memory, only FPM.
Thank you SSTV2 and bloodem.
---
Some time ago I found this motherboard at a recycling center:
It came with the 486 CPU and I paid almost nothing for it. So I added some RAM I had laying around, an ISA VGA, a controller card and I tried to make it post. But this is what I'm getting:
Sorry for the quality. Here what it says:
Award BootBlock Bios v1.0
Copyright (c) 1995, Award Software, Inc.
BIOS ROM checksum error
Keyboard error or no keyboard present
Detecting floppy drive A media...
Drive A error. System Halt
When I have a keyboard and a floppy controller I only get a checksum error and this:
Detecting floppy drive A media...
INSERT SYSTEM DISK AND PRESS ENTER
I asked about it on Reddit and I got lots of suggestions. One of them was to add a CMOS battery, so I did it but nothing changed. A kind soul found the motherboard manual for me and told me to check the jumpers, I checked it and I can't see anything wrong with it:
https://web.archive.org/web/20191111225419/ht … es/4dps0210.pdf
Another suggestion was to clean the ROM socket and its legs with 100% isopropyl alcohol, I also did it but again nothing changed.
I also replaced the RAM and checked if it could be something wrong with my AT PSU, but I couldn't find anything.
They also told me to replace the caps, but I don't have a soldering iron either spare caps. I'm a bit dumb and I have no soldering skills, so I'm afraid of doing this right now.
There's anything else I could do? Here are more images of the board:
That's the new battery I added. The jumper setting J6 is set to "CMOS memory normal operation". When I set it to "CMOS memory clear" nothing would happen.
Some jumper settings
More jumper settings
First pair of RAM sticks I used
Second pair
I remember seeing a thread here of a guy solving this issue by using FPM ram instead of EDO, but I don't know if that is my case.
Any help would be great. I really want a 486 with PCI slots.
Thanks.