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AUVA JUKO Baby XT BXM-10

Weird: last Saturday I picked up the same board somewhere near Bastogne - Belgium. It was stored there for over 20 years in a barn and started up fine. The BIOS printed "BIOS Ver 2.32"on the screen, nothing else, no brand or whatever.
 
Twospruces said:
Any idea what has caused all this carnage?
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Good old Varta NiCd battery - there was no battery on this motherboard ! However, someone saw fit to put one on the floppy/multi-io card.
At first glance I thought the mainboard was ok because the mulit-io looked good. Ah Gravity, clearly some drips got down on the mainboard and worked on the board parts not covered by resist.

NB: with NiCd batts there seems to be a way to make it so much worse - initially there is a little bit of leakage and we see the blue/green corrosion products on the cell itself and in a very local area, but then if you turn on the power, the battery gets a charge current and makes gas internally - this causes pressure, forcing the rest of the electrolyte out onto the board and spitting onto the surrounding area.

I guess the rule is never power on before you check the inside for a NiCd. + check the RIFA caps in the PSU, and watch out for the exploding Tantalum caps! who knew old computers could be so exciting :biggrin:.
 
Ruud said:
Weird: last Saturday I picked up the same board somewhere near Bastogne - Belgium. It was stored there for over 20 years in a barn and started up fine. The BIOS printed "BIOS Ver 2.32"on the screen, nothing else, no brand or whatever.
Click to expand...
what does the system case look like ? mine says VIP 800 on the front and AUVA on the back.

2FDF5B85-F68B-4CC7-94EA-DF1B5EE0C50B.jpeg
 
No case: it was just a piece of wood with a power supply fixed to it, two floppy drives and those metal pieces that you find inside a case where the board is screwed on (motherboard copper pillar ???). Clearly a test stand. I wanted the board, another guy just wanted the rest. So we both were happy.

​

 
Thankyou very much everyone who has helped me with this. It may not have been the most interesting problem in the end, but I learned a huge amount from you all about the fundamental workings of the PC and how to troubleshoot a board that wont post.

In the end its the fun of doing it rather than the end result and I had alot of fun with this.

Specs:
Auva Juko baby AT motherboard 1988/89?
Cpu nec v20
640kb ram memory
720kb 3.5” floppy
360kb 5.25” floppy
Mfm segate st-225 (20mb)
Western digital chipset hard disk controller
Floppy multi-io card with leaky rtc battery.
Vga / ega 8bit isa card. 15 pin and 9 pin connectors!
XT keyboard required!!!!
 
An nice update from my side: I received a XT the evening before I went on holiday, forgot about it, and stumbled about it looking for something else. It contains the same board, has 1 MB on board and most important: the BIOS says so! I cannot remember the other two boards doing that. Now it is a matter of setting the dip switches the same and using the same BIOS.

Having 1 MB means I can use the RAM-drive software I must have laying around somewhere. But If anybody does know what software came with this board and can point me to it, please!
 
To make a long story short, thanks to your ZIP if found the files I was looking for. I zipped the files: Juko.zip (see attachment). Both your and my ZIP contain a RAM drive. The main reason I'm interested is that I want to find out how the extra RAM is accessed. Because the BIOS accesses it as well, I have an extra source to find out.

I'll dump the ROM later.
 

Attachments

  • JUKO.zip
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