Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-03-13, 19:01

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have several Cyrix 5x86 chips, none of which have the 4x multiplier 2x Cyrix 5x86-120 1x Cyrix 5x86-100 2x IBM 5x86-100HF in a Gainberry upgrade marked as 120 Mhz I wish there was an easy way to short, or add some diode or resistor to force these into 4x mode. Maybe there is. Does anyone have a …

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Re: 486 mobo + 586 chip

Posted on 2011-03-12, 08:21

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What does your 486 case look like? I doubt you can get still get this on. Its pretty modern looking for a 486 case. There isn't a model number on it. I bought it new in Jan. 1997 with my 486. I am also looking for another case for my second 486, the m919 I have setup on the table. Unfortunately for …

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Re: Fastest PCI graphics card in a 486

Posted on 2011-03-11, 23:54

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you look at the far left of the chip, there is a vertical part number in white. All the M919 cache modules that have been posted so far say M919-0153. I've tried several early model P1 COASTS, none work except for the M919 SRAM modules.

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Re: 486 mobo + 586 chip

Posted on 2011-03-11, 21:15

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thought I'd post the face to those specs.

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Re: Fastest PCI graphics card in a 486

Posted on 2011-03-11, 20:25

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Regro Games, regarding that post, I think you have a winner. Try setting the L2 to Write-Back, power down, remove cache, power up, power down, reinsert cache, power up, resave BIOS such that L2: Write Back and check Cachechk and Speedsys again. With my other cache module (the more flakey one), this …

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Re: Fastest PCI graphics card in a 486

Posted on 2011-03-11, 20:19

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I noticed significant speed improvement with everyday office tasks when I inserted the 256 KB cache module. It was a real eye opener for me. I'd never want to use this board without cache again. Surprisingly, I've found some of the cache modules work better than others. On some of them, they …

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Re: Fastest PCI graphics card in a 486

Posted on 2011-03-11, 09:48

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The M919 that I bought new at a computer store in 1997 did not come with the cache module. However, I later found the cache module on eBay in about 2000. It was hard to distinguish them between the Pentium-based COAST modules, which will not work in an M919. The auctions still call them COAST …

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Re: 256AK vs 257AK Cache

Posted on 2011-03-09, 05:19

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you speculating or do you know this from past research or experience? ISSI and Alliance also use *256 notation. I am puzzled one company would take the oddball part number approach. Winbond's 64K chips read *512, which makes sense, not 513 or 514. I have the spec sheet for the W24257AK-15 chip …

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256AK vs 257AK Cache

Posted on 2011-03-09, 02:22

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does anyone know what the difference between 486 cache (2 rows of 14 pins) that is marked as *256AK-15 vs. that marked *257AK-15? I have, for example, cache with markings: UM61256AK-15 And some as: W24257AK-15 I am inclined to think that that the *257 contains an extra Kilobit. Any ideas why? Is it …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-03-09, 01:39

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, for the announcement that was on cpu-world. I cannot find it. If it was a non-public announcement, can you let me know which admin you are referring to? Thanks.

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Re: Fastest PCI graphics card in a 486

Posted on 2011-03-09, 01:36

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I ask because my Diamond Stealth 64 VLB (4MB) receives a significantly higher pcpbench score over my Matrox Millennium G200 PCI (16MB) card at a 40 Mhz fsb and a Cyrix 5x86 -120 cpu. PcpBench: Diamond Stealth 64 VLB score was 9.7 Matrox Millennium G200 PCI score was 7.6 PcChips M919 motherboard with …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-03-09, 00:00

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you post the link to this past group buy? I am having trouble finding it on cpu-world.

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Re: 486 mobo + 586 chip

Posted on 2011-03-08, 23:09

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Windows NT 4.0 will crash during boot at 1:1 with a 40 Mhz FSB and a Cyrix 5x86. I have not yet isolated exactly what is causing the crash. It may be that the Matrox G200, Adaptec Ultra2 SCSI, or the 3Com 3c905C-TX-M PCI card refuses to run at 40 Mhz, or a combination of these and particular Bios …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-03-08, 23:01

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you know the buyer of that eBay auction? If so, can you send him my contact information, or give me his contact information? I'd like to buy one if there was a surplus.

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Re: 486 mobo + 586 chip

Posted on 2011-03-08, 15:54

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you have the Quake 1 source? I doubt my system can outperform the AMD-x5 200 Mhz on all accounts, except for memory throughput and probably most or all 2D-based office apps. I've only been experimenting with tweaking for 1 day, so who knows what might come up. My goal is more for speed and long- …

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Re: 486 mobo + 586 chip

Posted on 2011-03-08, 15:02

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I ran Speedsys on my Biostar MB-8433UUD v3.0 as well. It performed much better than the PCchips M919. All memory results now outperform the AMD at 200 Mhz with a stock Cyrix 5x86 - 120 Mhz and a Matrox G200. Here is a summary of all tests I have run: Speedsys: Benchmark number: 65.49 L1: 172.98 MB/s …

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Fastest PCI graphics card in a 486

Posted on 2011-03-08, 12:29

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am curious, what is the least old and fastest PCI graphics card you guys have been able to get working in a socket 3 486? Is the core speed allowed to exceed the processor speed? The most modern PCI graphics card I can get working in my PCI-based 486's is a Matrox Millinnium G200 w/16MB SDRAM. I …

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Re: 486 mobo + 586 chip

Posted on 2011-03-08, 11:31

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My 3Dbench results aren't spectacular because I am using a 1:2/3 Host-to-PCI clock divider in the BIOS for enhanced system stability in WinNT4. When it is set at 1:1, I get a 3Dbench score of 91. Also, a Matrox G200 graphics card isn't the best 3D performer; it is know for its 2D capabilities (all I …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-03-08, 11:07

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tetrium, what was your prognosis of the Cyrix 5x86 - 133? Does it have a 4x multiplier in it? Does it run stably at 33/133? I have two systems which run exceptionally well with the Cyrix 5x86 - 120 in WinNT4 and Win98SE (all enhancements turn on, except for branch prediction). I would be interested …

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Re: 486 mobo + 586 chip

Posted on 2011-03-08, 07:20

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have attached some screen shots of SpeedSys and Cachechk. [NOTE: filenames of the first and second cachechk image are slipped. I can't seem to correct it -- perhaps some bug with this forum's software.] The measured cpu clock speed from Cachechk 4 does not agree well with that of Cachechk 7. …

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