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

Posted on 2011-01-07, 23:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm also looking for 12ns cache chips. Have you ever read this guide? http://www.pcguide.com/ref/mbsys/cache/char.htm It seems that tag ram is the most important part of cache. First I'm going to buy 12ns tag ram then I will consider upgrading rest of cache memory. (: I only have 256kB. My CPU was …

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

Posted on 2011-01-08, 00:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

retro games 100 wrote: Well, to solve the problem, I removed 1 SIMM stick. I reduced the amount of RAM from 64 to 32 MB. Have you tried using 4x 16MB SIMM's? Perhaps the board just doesn't like ds SIMM's??

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

Posted on 2011-01-09, 07:51

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Unfortunately, I've caught some winter bug, and I'll have to abstain from the exciting world of retro hardware for a few days.

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

Posted on 2011-01-20, 00:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've never gotten a Am5x86 to power up at 180 MHz. I've tried 4 or so of them. Even running 4v didn't help.

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

Posted on 2011-01-20, 07:41

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

swaaye wrote: I've never gotten a Am5x86 to power up at 180 MHz. I've tried 4 or so of them. Even running 4v didn't help. Did you try 5V? I didn't have any success with the cool running ADZ variant, but the one I got to work was a hotter running ADW variant, which seemed to tolerate the 180MHz …

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

Posted on 2011-01-26, 16:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a way to calculate the cacheable limit for the L2 cache on this motherboard? I have 256k with a 32K x 8 TAG and 4 x 32K x 8 in bank 0 and 1.

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

Posted on 2011-01-26, 17:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a way to calculate the cacheable limit for the L2 cache on this motherboard? I have 256k with a 32K x 8 TAG and 4 x 32K x 8 in bank 0 and 1. Sorta, but there doesn't seem to be 1 single rule that always works, theres too many factors involved. All I know is that doubling the L2 cache seems …

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

Posted on 2011-01-26, 18:23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some 386 and 486 board manuals mention the cacheable range. From what I have read so far, i would say there is a rule: 32kb 8MB 64kb 16MB 128kB 32MB 256kb 64MB 512kb 128MB 1024kB 256MB These values are for write-through operation. In write-back mode the cacheable range is reduced by half. I don't …

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

Posted on 2011-01-26, 20:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have found this manual : http://replay.waybackmachine.org/20020207160001/http://biostar-usa.com/Archives/achivemanual/8400uud/8433UUD_Manual.htm Your motherboard supports up to 512Kb cache and 128MB memory. You can use three cache configurations (128Kb, 256Kb, 512Kb) with cachable memory range …

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

Posted on 2011-02-05, 03:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I can confirm BasterMike's words about cacheability. The same goes for Socket 7 - Intel and VIA chips. But s7 ALI is a bit strange about the cacheability amount or maybe they're talking about the same but in a strane manner. As for the X5 133 overclocking - not all models like 5V. I mean, some don't …

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

Posted on 2011-02-17, 21:35

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have just returned to this Biostar mobo, as seen in my original post. I've got it working with the P75 chip, at 200 MHz. (Elsewhere on Vogons, I have got a P75 working at 200 MHz, but that was on a different "SYL8884PCI" mobo.) The amazing thing is, the BIOS settings are completely maxed out on …

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

Posted on 2011-02-18, 10:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Edit 5: I got the board to post at 66 MHz bus speed, with a 3x multi = 198 MHz. The BIOS POST screens says 198 MHz, but it freezes after that. The memory count does not appear on the screen. This is really stunning result. I tried to boot up cyrix 5x86 100MHz with fsb set to 66MHz (multipler set to …

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

Posted on 2011-02-18, 10:19

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

udam_u, I have managed to get this mobo to work with a P75, 3x multi, 66 MHz bus speed = 198 MHz cpu speed. I ran cachechk7, and it worked. I also ran Speedsys, and it also worked. The Speedsys result wasn't as good as other tests, because I have to set all of the BIOS timings to very slow values. …

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

Posted on 2011-02-18, 10:57

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

udam_u, I notice that you wondered if I was using EDO / 50ns memory. Perhaps I need 50ns memory? I am using 60ns EDO, but if I am trying to run the bus @ 66 MHz, perhaps I need faster RAM? Now, the BIOS POST always freezes when the mobo is about to display the RAM count. Is 50ns EDO RAM rare? I have …

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

Posted on 2011-02-18, 11:11

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I guess that I must have been lucky earlier on today, with the 3x / 66 MHz = 198 MHz setting. Now, I cannot repeat this test successfully. The BIOS POST always freezes at the point when the memory amount and count is to be displayed. So, I only have one successfully saved report from that early test …

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

Posted on 2011-02-18, 12:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, I think that 50ns RAM can help you to obtain stability. 50ns EDO seems to be rare. I have a lot of memory modules but all are signed 60/70ns. On the other hand this instability might be caused by to high PCI frequency or too slow tag ram. Have you tested 1/2 PCI-FSB divider? I supose that you …

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

Posted on 2011-02-18, 13:16

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the board can cope with 66 MHz, because I have successfully run it at 66 MHz with an SX-33 chip. With the P75 @ 66 MHz bus speed, I have tried both of the BIOS PCI divider options: 1/2 and 2/3. Also, the tag chip is only 15ns. I'm really happy with this thing running at 50 / 4x = 200. …

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

Posted on 2011-02-18, 15:42

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's an excellent idea to use a variety of different video cards for testing. I use 4. Virge 325, Diamond Viper V330, Dell Nitro, and Trio64v+. They all seem to behave slightly differently, depending on what type of overclocking you are doing. For each speed configuration test, try all 4 video cards …

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

Posted on 2011-02-19, 23:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, very nice lot that you've got! If you see any more around, let me know. But I still think they might be remarked samples.

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

Posted on 2011-02-20, 00:24

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Might be (btw, I'm only getting 1 of these chips). When I can test it, I'll know for sure if it can run @ 133Mhz or not. I wasn't the one who found it though, I just said I wanted one (Well, actually 2, but since we had so many wanting 1 or more, all of us got 1 😁 ).

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