I bought this:

http://imgur.com/a/564vG

A single-board 486DX/33 computer.

It was a bit of an impulse buy, I don't honestly have any idea what it will take to bring this puppy on-line... I HOPE that some of the white plugs can be reverse-engineered into PS/2 or AT keyboard connectors and LED outputs, but who really knows...

keenerb wrote:

I bought this: […]
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I bought this:

http://imgur.com/a/564vG

A single-board 486DX/33 computer.

It was a bit of an impulse buy, I don't honestly have any idea what it will take to bring this puppy on-line... I HOPE that some of the white plugs can be reverse-engineered into PS/2 or AT keyboard connectors and LED outputs, but who really knows...

Just try to remember -DO NOT- plug it in to the standard ISA ports on any "normal" motherboard.. it most likely (more than likely) will short circuit and fry both it's self and the board. They're designed to go in to big AT backplanes only.

kithylin wrote:

keenerb wrote:

I bought this: […]
Show full quote

I bought this:

http://imgur.com/a/564vG

A single-board 486DX/33 computer.

It was a bit of an impulse buy, I don't honestly have any idea what it will take to bring this puppy on-line... I HOPE that some of the white plugs can be reverse-engineered into PS/2 or AT keyboard connectors and LED outputs, but who really knows...

Just try to remember -DO NOT- plug it in to the standard ISA ports on any "normal" motherboard.. it most likely (more than likely) will short circuit and fry both it's self and the board. They're designed to go in to big AT backplanes only.

I've got a few passive ISA backplanes. I wouldn't stick this into a "real" motherboard!

I also found this picture from another ebay listing. I was under the impression that the backplane supplies power to the SBC through the ISA bus in circumstances like this, so it looks like maybe there's a +5v (red wire) running from the adapter to the wiring harnass. That same connector has three other connected wires, so that might be the keyboard input. The other two may be LED connections but the harness shares a common ground?

keenerb wrote:

I've got a few passive ISA backplanes. I wouldn't stick this into a "real" motherboard! […]
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kithylin wrote:

keenerb wrote:

I bought this: […]
Show full quote

I bought this:

http://imgur.com/a/564vG

.............

A single-board 486DX/33 computer.

It was a bit of an impulse buy, I don't honestly have any idea what it will take to bring this puppy on-line... I HOPE that some of the white plugs can be reverse-engineered into PS/2 or AT keyboard connectors and LED outputs, but who really knows...

Just try to remember -DO NOT- plug it in to the standard ISA ports on any "normal" motherboard.. it most likely (more than likely) will short circuit and fry both it's self and the board. They're designed to go in to big AT backplanes only.

I've got a few passive ISA backplanes. I wouldn't stick this into a "real" motherboard!

I also found this picture from another ebay listing. I was under the impression that the backplane supplies power to the SBC through the ISA bus in circumstances like this, so it looks like maybe there's a +5v (red wire) running from the adapter to the wiring harnass. That same connector has three other connected wires, so that might be the keyboard input. The other two may be LED connections but the harness shares a common ground?

............

I don't know how they work, so sorry on that. Most of them I believe were OEM and designed for a specific backplate in a specific chassis and may be proprietary. I really don't know much. All I know is they blow up if they go in normal boards. Good luck with that thing.

I have never seen the brown-colored slot between the ISA ans PCI slots before? What is it for?

chose007 wrote:

Some new schrott again. […]
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Some new schrott again.

...

one of first Abit board

...

Looks like EISA.

https://en.wikipedia.org/wiki/Extended_Indust … rd_Architecture

Edit:
After some reading... it might not be EISA, but some raiser PISA slot.

kixs wrote:

Looks like EISA. […]
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Looks like EISA.

https://en.wikipedia.org/wiki/Extended_Indust … rd_Architecture

Edit:
After some reading... it might not be EISA, but some raiser PISA slot.

There's one on offer on eBay at the moment if anyone's interested. As you can see from the manual this board only has ISA and PCI - the brown slot is completely undocumented and mysterious. I've had one since new and I have to admit that, when I first got it and was trying to work out what it was, I assumed you could plug in either an ISA or PCI card as the manual said 'one shared slot'. Obviously I worked out what that meant later on.

It's almost certainly EISA.

If it were EISA, wouldn't all the ISA slots be EISA? Besides, stason.org says that's a "PISA" slot, whatever that is: http://stason.org/TULARC/pc/motherboards/S/SI … B4-REV-1-2.html

Sutekh94 wrote:

If it were EISA, wouldn't all the ISA slots be EISA? Besides, stason.org says that's a "PISA" slot, whatever that is: http://stason.org/TULARC/pc/motherboards/S/SI … B4-REV-1-2.html

If the documentation says it's PISA then I'd believe that, they must just be using the EISA-style edge connectors.

Yes, it does look a lot like one. Should an EISA slot be higher than an ISA slot? I think so if I look at pictures of the cards. The angle of the motherboard picture makes it hard to see...

Another other possibility would be a slot for a riser card, but that doesn't make a lot of sense of course...

keenerb wrote:

It's almost certainly EISA.

keenerb wrote:

It's almost certainly EISA.

Oh, it's an EISA slot alright from a physical point of view, but its function is what's unknown. The M1489 chipset only supports PCI - the M1487 is for the ISA bus. The PISA claims are completely unsubstantiated until someone actually uses the slot for something other than ISA use.

I distinctly remember having a board with ISA and EISA slots, so the fact that they're not ALL eisa isn't particularly disturbing.

A combination ISA/PCI slot is pretty bizarre though, I've never seen one of those. How does it keep the ISA contacts from shorting PCI cards?

Also, there's this which claims to be a PISA adapter:

http://www.arbor-usa.com/catalog/p_pisa-675.html

Looks a lot like an EISA edge connector to me.

Huh even more interesting:

I don't know if I'd go sticking a PCI card directly into that connector...

I guess, here might be the correct explanation: http://support.advantech.com/Support/Knowledg … =Knowledge+Base
And the reason is quite obvious - if you want to install the motherboard in a low desktop case that needs a riser, but you don't want to lose the PCI functionality, then you're free to go with a PISA to ISA/PCI riser. And PISA could possibly stand for P[CI]ISA.

hard1k wrote:

I guess, here might be the correct explanation: http://support.advantech.com/Support/Knowledg … =Knowledge+Base
And the reason is quite obvious - if you want to install the motherboard in a low desktop case that needs a riser, but you don't want to lose the PCI functionality, then you're free to go with a PISA to ISA/PCI riser. And PISA could possibly stand for P[CI]ISA.

This is how I understand this PISA slot from the get go (my post above).

kixs wrote:

hard1k wrote:

I guess, here might be the correct explanation: http://support.advantech.com/Support/Knowledg … =Knowledge+Base
And the reason is quite obvious - if you want to install the motherboard in a low desktop case that needs a riser, but you don't want to lose the PCI functionality, then you're free to go with a PISA to ISA/PCI riser. And PISA could possibly stand for P[CI]ISA.

This is how I understand this PISA slot from the get go (my post above).

I much prefer the idea of installing a Pentium system-on-card in it 😀 If I can find either I'll see if they work! Would be nice to clear up the mystery.

Personally I'd leave that slot alone, it could be any number of proprietary interfaces that were around at the time and plugging in the wrong card could easily nuke the board. That would be a shame as it looks like a real nice board.

Bancho wrote:

Was this the lot that was on UK ebay the other day? I was watching it. The Yamaha sound card was what peaked my interest and some of the boards. Glad i didn't bid in the end.

It was that lot, yeah. I like a good gamble. It paid off recently when i ended up with a cheap Adlib but not always. I'll be happy if the CPUs work and if the SS7 boards as I've always been curious about the MVP vs ALADDiN V battle. Someone has coloured the XG card in with a green felt tip! Hopefully it works.

and is clicks !