Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2019-06-29, 04:21

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Why does it need to be a side-by-side arrangement? "this stacked configuration"? We don't need the Gainbery module, it would be built into the design. Basically, we are copying the Evergreen QFP144 interposer, but without the [unnecessary] flush logic circuits, using PGA instead of QFP, and …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2019-06-29, 00:19

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sounds about right. You will probably want to re-read the thread starting from this sub-post, https://www.vogons.org/viewtopic.php?p=683687#p683687 to look for any caveats. I'm not free to re-read the thread right now. If cb88 didn't attach the desired files to the thread, then I don't have them …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2019-06-28, 22:07

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, this reseller has 37 immediately available: https://www.westfloridacomponents.com/IC490PE04/TI486SXL2-G66-GA+486SXL2-66+486+Processor+TI.html . $16.50 each. And when I looked as of ~6 months ago, I had found other sellers (I think one was on eBay) who also had over 100 chips. So, yes, I think …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2019-06-28, 21:25

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That is a common curiousity - why was such an oddball chip produced? I don't really have a suitable answer, but some customer may have wanted it for a custom design and when it became available it was too late to be used? No idea. But it seems that industrial suppliers have quantity of it as new old …

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Re: Native PS/2 mouse implementation for 386/486 boards using the keyboard controller

Posted on 2019-06-28, 20:33

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You'd probably have to read the thread. Its been so long and my life rather chaotic that I'm starting to forget things. That guy had the false impression that he could make a multi-purpose 486-to-386 interposer module in this manner, and I think he lost interest after realising this type of passive …

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Re: Native PS/2 mouse implementation for 386/486 boards using the keyboard controller

Posted on 2019-06-28, 19:45

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks. How proficient are you with KiCAD? Would you be interested in drawing up this little project? Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP! Someone else started on it then vanished.

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Re: Native PS/2 mouse implementation for 386/486 boards using the keyboard controller

Posted on 2019-06-28, 03:49

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have noticed that some boards with PS/2 support have things like turbo switch input pins and or polarity set differently. There is also a KBC type setting in the BIOS, but I don't know much about this. Maxtherabbit, do you have a BOM with part numbers? I might try to assemble one of your units. …

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Re: Biostar MB-8433UUD-A

Posted on 2019-06-26, 21:36

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

s.mouse, you've gone silent. Did you try one of the alternate graphic cards I listed, preferably the Matrox G200?

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Re: Biostar MB-8433UUD-A

Posted on 2019-06-25, 09:41

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I pulled out my Gigabyte GA486AM board and ran some tests using the Matrox G200. Am5x86-133 Cache - Quake - DOOM 256K - 14.2 fps - 1459 1024K - 15.2 fps - 1405 Am5x86-160 Cache - Quake - DOOM 256K - DNT - DNT 1024K - 18.2 fps - 1179 So the Gigabyte board does appear to be marginally faster than the …

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Re: Biostar MB-8433UUD-A

Posted on 2019-06-24, 09:03

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

s.mouse - Can you also try using a different graphics card? Perhaps one of the cards I have tested below? Tonight, I squeezed in the time to run the MB-8433UUD (original version, pre-2.0) with various graphics cards. Am5x86 @ 133 MHz, 32 MB FPM (single stick), double-banked 256K cache, Adaptec …

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Re: Biostar MB-8433UUD-A

Posted on 2019-06-24, 03:50

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you run the Quake timedemo on both systems and see if there is the same percent of difference between the boards?

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Re: Biostar MB-8433UUD-A

Posted on 2019-06-24, 01:40

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't see the frequencies listed on that chart. I have both of these boards and I might investigate this. You can use the serial to PS/2 protocol converters noted in this thread on the Gigabyte board, but it only works well if you aren't using a KVM. Or if you are using a KVM, you need to use the …

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Re: Biostar MB-8433UUD-A

Posted on 2019-06-23, 08:12

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is the graphics card the same between the Gigabyte and the Biostar? Did you check the part number on your memory chips to ensure that it is indeed FPM? Only use FPM on this board. Judging bo your BIOS screenshots, it doesn't appear that you are using the 2014 BIOS? In the 2014 BIOS, I also set the …

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Re: Wing Commander Prophecy benchmark?

Posted on 2019-06-22, 02:10

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by feipoa

in Marvin \ Software

in Marvin \ Software

When I look thru this directory of patches for WC Prophecy, it does seem like D3D is supported. There's OpenGL patches as well. https://www.wcnews.com/wcpedia/Category:Wing_ … rophecy_Patches

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Re: 486 CPU VRM interposer board made from off the shelf parts

Posted on 2019-06-21, 21:06

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many boards have the option to set L1 and L2 cache types independently.

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Re: KVM Switches

Posted on 2019-06-21, 21:04

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Off topic Twins - that's lucky. People think its twice the work, but in the long run, it is really only 1.5x more work than 1 kid. Imagine having one child, then three years later having another and doing all the same baby work again. The ultimate stroke of luck is to have fraternal twins - one boy …

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Re: Wing Commander Prophecy benchmark?

Posted on 2019-06-21, 18:46

by

by feipoa

in Marvin \ Software

in Marvin \ Software

Oh? Will it work on Win95c? And is it realistic to use on a slower system, or will it slow down the game?

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Re: 486 CPU VRM interposer board made from off the shelf parts

Posted on 2019-06-21, 18:00

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Single-banked cache on this board is probably limiting your use to 3-1-1-1 for the cache speed selection at 40 MHz. L2 cache in WB mode has almost no effect on 486 boards. I'd be impressed with 1 fps increase in DOOM.

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Re: Wing Commander Prophecy benchmark?

Posted on 2019-06-21, 17:45

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by feipoa

in Marvin \ Software

in Marvin \ Software

Not sure what FRAPS is, but that's too bad.

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Re: Wing Commander Prophecy benchmark?

Posted on 2019-06-21, 09:23

by

by feipoa

in Marvin \ Software

in Marvin \ Software

OK, thanks. I tried one of the 3rd party patches to increase the framerate above the default 30 fps, but the program said that its not compatible with my version of Windows (w95c).

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