Huge number of K6-2E+/570ACZ CPUs for sale on eBay

Posted on 2021-12-14, 20:25

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is a huge number of these K6-2+ Embedded Super 7 CPUs for sale. Looks like the price is $69.45 for a lot of 3 each. That comes out to $23.15 each, which is not a bad price. I am planning to pick 1 lot of 3 up to try out. Just giving a heads up in case anyone is interested. https://www.ebay.com …

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Re: 486DX/50 VLB Build

Posted on 2021-12-12, 18:23

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Great looking system! What's on the monitor in the last screenshot? Looks like some sort of fractal map. What are the games you're targeting for play on this system? The image on the monitor is a graphics demo called Bogussat, short for Bogus Satellite. It generates random images that look like …

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Re: 486DX/50 VLB Build

Posted on 2021-12-12, 16:42

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One last change. I swapped the 3.5" 1.44MB floppy drive for a combo 3.5" 1.44MB & 5.25" 1.2MB floppy drive. I think it matches the case much better.

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Re: 486DX/50 VLB Build

Posted on 2021-12-11, 16:27

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Overclocking the GPU from 50MHz to 57MHz gives a nice speed boost in Windows 3.11. Here are the results:

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Re: 486DX/50 VLB Build

Posted on 2021-12-11, 04:32

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here are also a few benchmark results:

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486DX/50 VLB Build

Posted on 2021-12-11, 04:25

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have been wanting to put together a 486 VLB build for quite some time. I finally got around to getting everything together. I did not have any grand ambitions for this build, but wanted a stable running system that did not reach for stars performance wise. I settled on 486DX/50 as I already have …

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Re: Opti 82C391: Is there a DOS configuration utility for memory timings?

Posted on 2021-12-03, 05:39

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

NB! Don't trust CTCHIP, when it says something is enabled or disabled - it's buggy as hell, even showing different values depending on your display mode (the "M" key). Read the bits themselves and refer to documentation. Don't trust CTCHIP's explanations/descriptions. I did some more research and I …

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Re: Any advice on selling retro computer stuff?

Posted on 2021-12-03, 00:40

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I love how sellers want Ebay prices but don't want to pay Ebay their cut. As long as you use the correct descriptions and use good clear high resolution pictures Ebay is really the only game in town unless you target buyers directly on forums or Facebook (a lot more work). Places like Craigslist …

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Re: Any advice on selling retro computer stuff?

Posted on 2021-12-03, 00:19

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

(Moved) Anybody have any experience trying to move computer stuff online? I'm getting a little sick of Ebay not being cooperative. Iv listed a few parts yesterday morning but they haven't appeared in the searches yet nor do they show up when i check for my active listings on desktop. Only on eBay …

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Re: Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-12-02, 21:19

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I decided to hedge my bets on this build and I am picking up a Cirrus Logic CL-GD5426 VLB card that supports a 50MHz FSB. Going price was only $29 plus $6 shipping on eBay. This will also make DOS benchmarking much more meaningful. Looking at the memory chips on this card they appear to be 256Kx4 so …

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Re: Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-12-02, 04:38

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I haven't gotten the motherboard yet, but from looking at the settings, each VLB slot can be configured for synchronous or aynchronous operation. That should solved any issues with the 50MHz FSB speed. https://stason.org/TULARC/pc/motherboards/B/BIOSTAR-MICROTECH-INTERNATIONAL-CORPORATION-486-MB-97. …

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Re: What FPU for an AMD 386 DX 40 MHz?

Posted on 2021-12-01, 02:49

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are 40MHz 387 FPUs from Cyrix, IIT & ULSI. I have 2 from Cyrix in my two 386/40 builds. Here is a great article that goes into detail on all of these: https://dougx.net/gaming/coproc.html Great article, thanks ! Anyone buy one of the IIT from the china source on ebay ? Have a ULSI and a …

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Re: What FPU for an AMD 386 DX 40 MHz?

Posted on 2021-11-29, 22:56

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello folks, I was wondering: I never saw 80387 40MHz FPUs around. So, if one has an AMD 386 DX 40 MHz and wants to add a FPU, I guess should add an Intel 80387 33 MHz. Wouldn't that cause the CPU to downclock to 33 MHz? Or, would the CPU force overclock the FPU to 40MHz? If so, will this cause …

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Re: The World's Fastest 486

Posted on 2021-11-29, 13:33

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just for grins, I ran Quake 1.08 Timedemo Demo1 on my Cyrix MediaGX 266MHz overclocked to 300Mhz. The result is 41.6 FPS.

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Re: Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-11-29, 06:00

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BitWrangler wrote on 2021-11-29, 05:06: jasa1063 wrote on 2021-11-29, 03:32: If worse comes to worse, I have 2MB ISA CL-GD5429 video card I can use. Not optimal, but that is at least my back up plan. I've had those running at 60, but they needed a heatsink to avoid corruption in windows after …

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Re: Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-11-29, 05:45

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you going to focus on DOS or Windows for this build? The Diamond Viper VLB is known to be extremely slow on DOS at the standard 320x200 VGA resolution most games use, I think even some ISA cards beat it. However performance on Windows and VESA modes in DOS should be good. The Cirrus Logic …

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Re: Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-11-29, 03:49

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If worse comes to worse, I have 2MB ISA CL-GD5429 video card I can use. Not optimal, but that is at least my back up plan. Try your existing card at 1ws It’s slower than 0ws at 33mhz but still better than isa Thanks for the tip. I will certainly try that once I get all the parts and get it …

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Re: Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-11-29, 03:32

by

by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If worse comes to worse, I have 2MB ISA CL-GD5429 video card I can use. Not optimal, but that is at least my back up plan.

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Starting a new 486 VLB build @50MHz FSB: VLB video card compatiblity

Posted on 2021-11-29, 00:55

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am in the process of putting together a 486 VLB build with a Biostar MB-1433/50UCV-e motherboard and 486DX/50 CPU. I currently have a Diamond Viper VLB 2MB video card. Will this video card operate at 50MHz? I am still waiting on parts, but I just want to know what to expect when trying running 486 …

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Re: Opti 82C391: Is there a DOS configuration utility for memory timings?

Posted on 2021-11-28, 18:25

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by jasa1063

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am not sure if slow refresh and hidden refresh are mutually exclusive. They are not mutually exclusive. Slow refresh is about how often the RAM gets refreshed. Usually "slow refresh" means that three of four refresh cycles are skipped. Most standard PC RAM is not specified for slow refresh, so …

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