Re: Anyone have AT form factor specification?

Posted on 2022-08-02, 13:52

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you so much. Good to know it isn't because mine is screwy. And yes, I did notice something with the video card when I took these pictures but couldn't immediately determine what it was. It went in easy as did the other two boards in there. And looking at the uncropped picture, the NIC two …

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Re: Sunbrighting a disgustingly yellowed keyboard: A Visual Experiment

Posted on 2022-07-29, 11:52

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not entirely there yet, but the case has whitened perfectly and the keycaps are a way healthier beige than the previous sickly yellow they were. Hopefully sitting in the sun through August will return the whole keyboard to its initial color and I can hook it up to my XPS D333 :sunglasses: Wow! …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-29, 11:48

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Could you measure something on it so I can compare? A good one might be distance from the closest edge of the closest slot to the closest point on the keyboard hole. See picture for description and my measurement. For what it's worth I used a caliper around those edges, but the keyboard port …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-28, 15:49

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, the specifications appear to have been fairly loose. I've had great difficulty getting certain AT motherboards into supposed AT cases. Also, certain ISA cards won't fit in certain AT cases/boards - you have to remove the I/O bracket to use them, because the alignments are all wrong. I had this …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-28, 15:46

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have that case and it lines up with the motherboard I have in it. https://www.vogons.org/viewtopic.php?f=25&t=84289 Could you measure something on it so I can compare? A good one might be distance from the closest edge of the closest slot to the closest point on the keyboard hole. See picture for …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-26, 23:02

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just found an interesting picture, probably not interesting to many of you experts out there. But this pic shows a keyboard hole in a no-name type case that's oblong, so apparently there were issues with this. https://ancientelectronics.files.wordpress.com/2014/04/386alt2.jpg Come to think of it, I …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-26, 22:54

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's harder than it might seem to do this measurement with any precision using a sliding caliper, so take this with a grain of salt. Got 31.8 mm from edge to the center of the connector. DSC_6938.JPG Measuring mobo edge - connector edge (42.5 mm), and subtracting half the connector's measured width …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-26, 22:32

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got this NOS AT case and motherboard, and the keyboard connector is not centered in the case hole. It's strange, I've never expected this would even be a thing. From the case's perspective, the keyboard connector is too close to the expansion slots. The keyboard plug does fit into it without …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-26, 22:29

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Supposedly the IBM XT 286 (5162) motherboard was the first Baby AT form factor and where it's derived from. Right! I think the only difference is that some of the mounting hole positions are taken from the original AT boards (though in some cases boards have holes that match both XT and AT). I'll …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-26, 21:44

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On a random ASUS Socket 7 motherboard I have at hand I measured 23mm from the center of the mounting hole to the center of the keyboard connector. I made the measurement at the edge of the board. Can you post pictures of the case you're having the problem with? Unfortunately this kind of annoyances …

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Re: Anyone have AT form factor specification?

Posted on 2022-07-26, 20:58

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got this NOS AT case and motherboard, and the keyboard connector is not centered in the case hole. It's strange, I've never expected this would even be a thing. From the case's perspective, the keyboard connector is too close to the expansion slots. The keyboard plug does fit into it without …

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Anyone have AT form factor specification?

Posted on 2022-07-26, 15:44

by

by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got this NOS AT case and motherboard, and the keyboard connector is not centered in the case hole. It's strange, I've never expected this would even be a thing. From the case's perspective, the keyboard connector is too close to the expansion slots. The keyboard plug does fit into it without …

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Re: Bought these (retro) hardware today

Posted on 2022-07-24, 00:54

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not very retro, but old enough to get a good deal: a full FX 6100 system minus any hard drives for $25.00. The seller even had the spare cables for the power supply, and the power supply alone was worth the price. Sixteen gigabytes of DDR3 1600, a USB 3 card, a Syba SATA card (he had lots of drives …

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Re: Why doesn't MPXPLAY work?

Posted on 2022-07-22, 19:05

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by eesz34

in Marvin \ Sound

in Marvin \ Sound

I only have 8MB RAM in this right now, could that be it? It's possible. Honestly, I'm not sure what the system requirements for MPXPLAY are. Maybe it's listed in the program documentation. For reference, I have 64 MB RAM on the Pentium MMX rig which houses my OPTi card. Just got more RAM, and that …

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Re: Why doesn't MPXPLAY work?

Posted on 2022-07-19, 18:25

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by eesz34

in Marvin \ Sound

in Marvin \ Sound

I'm trying out a SB16 compatible soundcard with MPXPLAY and getting stuck. It's a Pentium and it's an OPTi card. Here's how I use MPXPLAY on my OPTi 82C930: MPXPLAY.EXE -scvom 100 For me, this initializes the card in WSS mode (shown in the upper right corner) and plays MP3 files perfectly. You may …

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Re: Why doesn't MPXPLAY work?

Posted on 2022-07-19, 17:33

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by eesz34

in Marvin \ Sound

in Marvin \ Sound

konc wrote on 2022-07-19, 17:23: Could it be the file name? Just throwing in an idea. Just renamed one to something very simple and short, and still no go.

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Why doesn't MPXPLAY work?

Posted on 2022-07-19, 17:15

by

by eesz34

in Marvin \ Sound

in Marvin \ Sound

I'm trying out a SB16 compatible soundcard with MPXPLAY and getting stuck. It's a Pentium and it's an OPTi card. The first time I tried running it, it complained it couldn't find a sound card, so I ran mpxplay -sct and it detected a couple options. Now it runs with no complaints, and says "SBp" in …

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Re: Use of 2nd floppy controller on ISA

Posted on 2022-07-17, 16:26

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A standard mainboard BIOS only supports a single floppy controller, so you won't get it to work without specific drivers. If you can just set the card to a different port address, but not a different IRQ (than 6) or a different DMA channel (than 2), you need a BIOS / driver that only ever enables …

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Use of 2nd floppy controller on ISA

Posted on 2022-07-17, 15:12

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a Pentium MB that has a floppy connector but am considering adding a 2nd controller on an ISA card. The ISA card has jumpers to set it to a different I/O address, but no BIOS, just s simple basic card. Without getting to the why, I'll likely boot from the integrated controller (since I …

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Re: What is "Remote Power Connector" on AT motherboard?

Posted on 2022-07-14, 21:04

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by eesz34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There was a period when Energy Star/ "Green" PC standards made their way into some AT stuff, probably around 94-97ish, where things behaved halfass ATXy if all components supported it. So need "green" mobo, "green" CPU and "green" PSU so sleep/wake and soft power on/off work right. edit: Article …

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