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Bought these (retro) hardware today

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Reply 24560 of 52352, by stamasd

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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.

I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O

Reply 24561 of 52352, by Predator99

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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.

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Reply 24562 of 52352, by wiretap

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^--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.

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Reply 24563 of 52352, by PDXSonic

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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

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Reply 24564 of 52352, by liqmat

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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.

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Reply 24565 of 52352, by bjwil1991

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

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Reply 24566 of 52352, by liqmat

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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.

Reply 24567 of 52352, by Predator99

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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:

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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:

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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!!!!

Reply 24568 of 52352, by Predator99

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liqmat wrote:
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.

Looks very cool! Can you please post some better pictures, also of the inside?

Reply 24569 of 52352, by stamasd

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Predator99 wrote:
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 des […]
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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:

IMG_9883r.jpg

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?

That is the oscillator trimmer according to the IBM PC 5150 technical manual http://minuszerodegrees.net/manuals/IBM_5150_ … 22507_APR84.pdf
It's an adjustable capacitor of 5-30pF and is used to fine tune the system clock frequency. The system will probably run with a fixed capacitor in place (try something like 15 or 20pF) but the clock frequency may be a little nonstandard with that. Best to replace it with a similar value adjustable capacitor and calibrate the clock with a frequency meter or oscilloscope. You can easily find such capacitors on ebay, Mouser etc; if you don't have an oscilloscope, there are basic frequency counters on (again) ebay, Amazon etc for under $20. Here's an example which is identical to one I have and use for similar purposes https://www.amazon.com/0-1MHz-Signal-Frequenc … equency+counter

I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O

Reply 24571 of 52352, by stamasd

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You're welcome. You should start by figuring out if the oscillator is working at all e.g. see if there is a CLK signal at the ISA slots (test between pin B20 and ground http://www.hardwarebook.info/ISA#Pinout)

I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O

Reply 24572 of 52352, by Predator99

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Indeed, there is nothing. Compared with a working 12 MHz 286. Was not sure if my Multlimeter can handle these frequencies, but on the 286 it shows 7.9 with Turbo and 11.6 without (quite overclocked therefore).

Then I need to exchange the crystal. Will check if I have a spare...I assume the resistor is not neccessary first?

Reply 24573 of 52352, by PcBytes

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Bought two boards today.

First one is this ASUS P4C800-E Deluxe. It was in a pretty sorry state as opposed to what you see in here. NB heatsink was nearly smashed and the respective retention clips were damaged. Thankfully I had some scrap 865G board so I took care of that. Next up was bulging caps which I fixed too.

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Note that the CPU and HSF (along with the retention bracket as well) weren't part of the board when I bought it. I had the CPU from a Intel Desktop Board (D865PERL) and the HSF+retention bracket came from one of my P4P800 boards (865PE as well)

Up next is this MSI P965 Platinum. This came bundled with a Pentium D 925 Presler and the HSF in that picture. This one also had 3 bad caps and didn't POST when I first tested it ( the P4C800 did POST with the bulging caps before recap) but after replacing the three bad buggers, it came back to life.

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"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 24574 of 52352, by blurks

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Predator99 wrote:

Then I need to exchange the crystal. Will check if I have a spare...I assume the resistor is not neccessary first?

I would suggest to start a new/separate thread to discuss those question more in depth.

Last edited by blurks on 2018-08-05, 20:05. Edited 1 time in total.

Reply 24577 of 52352, by dickkickem

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liqmat wrote:

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.

computerlot.jpeg

You can never escape from those P4 Dell Dimensions.

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Reply 24578 of 52352, by Eleanor1967

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I also had some luck on the flea market today (for just under 20 €).

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Reply 24579 of 52352, by stamasd

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dickkickem wrote:

You can never escape from those P4 Dell Dimensions.

Wait until 20 years from now people will pay $5000 for these "collectibles"

I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O