CGA and a EMS card? 3rd one for me, hopefully I get it running this time...

MDA or CGA, MFM and VGA

now thats what i call retro

That second Chips 80286 has some screwed-up memory chips. That board has taken some serious physical abuse.

And, the "Also IBM XT?" is in fact a IBM PC motherboard.

Predator99 wrote:

80486...what kind of connector is this above the memory slots? Never seen...

IMG_9861-r.jpg

It may be used to connect various types of riser boards and in some cases additional system boards. Does it say anything on the back of the board? Also interesting it includes a soldered 486DX and also has an upgrade socket...

Edit: Ah, maybe the socket is to add an additional processor board, and the system was an industrial one with one or more processors (which would explain the additional socket)?

stamasd wrote:

That second Chips 80286 has some screwed-up memory chips. That board has taken some serious physical abuse.

And, the "Also IBM XT?" is in fact a IBM PC motherboard.

You are right...its the Original 1981 PC board!!! Was only a quick&dirty asigment by me without google...

Contacted the seller gain yesterday. He has another lot with interesting boards. He told me that he got everything from a e-waste bin. I asked him if also the cases were in it but no reply yet...

Yes I am aware everything is damaged and quite dirty. Will clean and fix before testing it. But not much time at the moment.

yawetaG wrote:

Predator99 wrote:

80486...what kind of connector is this above the memory slots? Never seen...

IMG_9861-r.jpg

It may be used to connect various types of riser boards and in some cases additional system boards. Does it say anything on the back of the board? Also interesting it includes a soldered 486DX and also has an upgrade socket...

Edit: Ah, maybe the socket is to add an additional processor board, and the system was an industrial one with one or more processors (which would explain the additional socket)?

Oh interesting. Will take a look if I find a suitable card in the pile. The 486 is on a socket. Board is labeled "486-33.256kBC..ISA.MITAC.ABC m433c22" and "A4865/A4866-XX V2.1 COMP".

Octek Trident VGA and some kind of IO card:

That I/O card is the original IBM 5150 floppy controller.

argh...this means the seller most probably had the complete PCs and disassembled them 😵

Hopefully he can also get the cases. But if yes, would be rather difficult to ship to me and I am running out of space...

Got some more goodies for my Matrox Mystique today. 😀

Predator99 wrote:

Chips 80286
2nd one

That's cool, I have near enough the same motherboard with just a few differences such as the colour, jumper pins over by the battery & a row of resistors instead of those orange coloured chips for example. The CPU in mine is an Intel 286 10MHz overclocked to 12MHz and it has 1MB RAM.

yawetaG wrote:

Predator99 wrote:

80486...what kind of connector is this above the memory slots? Never seen...

IMG_9861-r.jpg

It may be used to connect various types of riser boards and in some cases additional system boards. Does it say anything on the back of the board? Also interesting it includes a soldered 486DX and also has an upgrade socket...

Edit: Ah, maybe the socket is to add an additional processor board, and the system was an industrial one with one or more processors (which would explain the additional socket)?

I don't think the 486DX is soldered. If you look closely you can see a tiny bit of a socket underneath it. And the extra socket is for a Weitek 4167 coprocessor (PGA142).

That extra slot's connector looks suspiciously like the one used on Mac IIs for the NuBus expansions. Of course that doesn't mean the board has NuBus, but these connectors were commodity hardware during that time.

(edit) there are also a lot of damaged capacitors on that 486 board, especially near the coprocessor socket. I would replace them before trying to power up that board.

stamasd wrote:

yawetaG wrote:

Predator99 wrote:

80486...what kind of connector is this above the memory slots? Never seen...

IMG_9861-r.jpg

It may be used to connect various types of riser boards and in some cases additional system boards. Does it say anything on the back of the board? Also interesting it includes a soldered 486DX and also has an upgrade socket...

Edit: Ah, maybe the socket is to add an additional processor board, and the system was an industrial one with one or more processors (which would explain the additional socket)?

I don't think the 486DX is soldered. If you look closely you can see a tiny bit of a socket underneath it. And the extra socket is for a Weitek 4167 coprocessor (PGA142).

I was just guessing, TBH. The only other place I've seen the kind of connector that's above the memory slots is on certain Japanese systems where the motherboard is basically build out of modules that can be swapped for different configurations.

What would be the use for a co-processor on a system that already uses a DX processor?

yawetaG wrote:

I was just guessing, TBH. The only other place I've seen the kind of connector that's above the memory slots is on certain Japanese systems where the motherboard is basically build out of modules that can be swapped for different configurations.

I was talking about the square PGA142 socket, not the NuBus-like slot connector.

What would be the use for a co-processor on a system that already uses a DX processor?

The Weitek works in a completely different manner from the internal FPU; there were some programs optimized for the Weitek that didn't run so well on the regular FPU. Yes it's an oddity but not absurd.

In the mean time I have found 4 cards with the same connector. I assume its some kind of bus and a cable interconnects them all.

^--96-pin DIN-41612/IEC-60603-2 connector. They're used as a backplane connector for tons of different applications, both industrial and automotive. But one of your cards looks to be a 64-pin and won't fit. They usually plug in directly for non-seismic applications, or in a VME type slot for retention in seismic qualified applications. Rarely do they use a cable connection with a riser from all the ones I have at work.

Got some good cards today for basically nothing, now I just need to finish building a test platform to start testing the cards I've been getting.

From top left clockwise:
ATi Mach64 ISA
Reveal 23-023-007
M-Audio Delta 410 (no breakout cable 😢 )
Orchid Technology ProDesigner II
Diamond Stealth III S500 32MB PCI

Picked this lot up today mostly for the 286-12 in the bottom right corner. The Gateway on the very left, though, is loaded up with full and half height SCSI drives and a three internal connector SCSI controller. All the Gateways are P-II models I believe at a quick glance. Some are basic P4 systems. Other than the 286-12 the rest I have no use for so I might part these out. Plan on cleaning up the 286-12 which is in excellent shape.

The 286-12 is B-E-A-Utiful

bjwil1991 wrote:

The 286-12 is B-E-A-Utiful

Yes and a very smart individual cut the barrel out and replaced with a wired battery so no leakage thank goodness, but I still need to test the beast next week. Let's hope it works without much fuss.

I have 2 questions related to my latest lot and dont like to open a new topic:
1) For the IBM PC board, this variable cap is destroyed:

What replacement do I have to buy? Or can I shorten it or install a fixed value cap for testing purposes? If yes, which one?

2) This 286 board is not running:

In the 20 kg box I have found some single ICs. One of them is a "PAL16R4ACN-8735". My assumption is that it belongs on this board, below th ISA slot. The empty socket there is matching and a very similar PAL is already installed (other circle). Does somebody have a similar board and can verify?

Thank you!!!!