Re: The World's Fastest 486

Posted on 2021-04-03, 18:33

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My new video is online and I did beat your scores. :) https://youtu.be/qPRSHI4JoWI Damn. I tried to reach the same heights with my M919 but my cache module just didn't want to play nice. It isn't completely stable at 3-1-3 and at 2-1-2 it completely gives up. The highest score I could get in …

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Re: Abit AB-PB4 twin paradox

Posted on 2021-04-03, 06:27

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Shared info about one of these boards here . It is a fast one. Fast as in it can do 100+ fps 3dbench (it seems so...) and 30k+ in Vspeed or Landmark video? If so, I see no hope of telling the chips apart as your M1489 is "SE" not "SC" like my faster one. I hope I can lay my hands on more of these …

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Re: Abit AB-PB4 twin paradox

Posted on 2021-04-03, 04:25

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, it took me more than a month (making the program itself took 20 minutes with a break in the middle...), but finally I could sit down with these PB4s and check everything. The results are not very surprising but bewildering nonetheless. Fast control register space: 00: FF 0D 0D C5 FF FF FF FF …

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Re: Why I do this

Posted on 2021-03-31, 19:17

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

flupke11 wrote on 2021-03-31, 18:38: sort of escapism that's fairly harmless (unlike other habits to relieve stress). Spot on.

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Re: 80386 BIOS image collection

Posted on 2021-03-15, 04:54

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And another one I couldn't identify, at least it's "new": #92 Board ID : Unknown 386DX/486DLC (again, feel free to id, please) Chipset : UM82C481/482 BIOS : MR 386DX/86DLC BIOS V.1.44 (still in Los Gatos) BIOS ID string: n/a Filename UMC.jpg File size 1.26 MiB Views 130 views Filename UM82481M.zip …

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Re: 80386 BIOS image collection

Posted on 2021-03-15, 04:49

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And an old debt of mine. It's not even the board I was asked to upload a BIOS dump from because that very piece died on me almost instantly. But I found another one so it's here: #91 Board ID : Unknown 486SLC-33 (feel free to id it which I'd appreciate) Chipset : ALI M1217-40 BIOS : MR 386SX/86SLC …

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Re: 80386 BIOS image collection

Posted on 2021-03-15, 04:42

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Board ID : 303N1 V1.1 Chipset : ALI M1217-40 BIOS : MR BIOS MR001-SX V.1.41 BIOS ID string: n/a I seem to have the same board but the BIOS originates from somewhere else - unfortunately I don't remember the seriously damaged board I removed it from just to have MR BIOS for another board I may find …

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Re: Help with Neat N286-5 Motherboard

Posted on 2021-03-15, 00:38

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think it's entirely possible that turbo switches between 10 and 20MHz. My permanent 286 toggles between 8 and 20, my 286 test board between 6 and 12. I'd probably be bold enough to experiment with anything that looks like a jumper header. On the fly, running a real time benchmark like topbench or …

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Re: Abit AB-PB4 twin paradox

Posted on 2021-02-15, 16:08

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

... Thanks, it'll be quite a project! But, you gave me a lead. I'll be really curious as soon as I'm capable of feeling curiosity. After my first workday, I just can't... Edit. And talking about debug... Well, if that's the string that I saw in the first two blocks of the C000:0000 dump then the …

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Re: Abit AB-PB4 twin paradox

Posted on 2021-02-14, 07:23

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you take a picture of the chipset ? Maybe there's a different chipset revision on both causing this behaviour ? In case the silkscreens aren't enough: chipset_fast.jpg ("Fast" chipset) chipset_slow.jpg ("Slow" chipset) I also ran benchmarks at 4*33MHz, with a Diamond Virge/DX (I was lucky again …

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Re: Abit AB-PB4 twin paradox

Posted on 2021-02-13, 11:26

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Cant help but will though my results in as have the same motherboard, same revision, same CPU and same bios settings. Thanks, I'll give 33 a try. I have a few Virges lying around, and eve the permanent build's VGA is a Miro Virge/DX. It's just one single jumper difference to get to 33MHz FSB. It …

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Abit AB-PB4 twin paradox

Posted on 2021-02-13, 05:51

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

(Foreword - I feel the need to apologize for the lack of pictures - one of the boards is built into a permanent system and it wouldn't look too useful with all the cards and cables covering most of it.) I happen to have two, apparently identical AB-PB4 boards. For the tests I equipped both with an …

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Re: 486DX PC running really slow. Thoughts?

Posted on 2021-02-04, 13:18

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

But I should give a "486DX-60" a try. 66...? I'm not sure. Because VLB and all . That's why he said PCI motherboards. Well, it took this long but finally I got a PCI/5x86@180 system working. It's the M912's PCI counterpart, the M919 but it performed even a tad worse than the M912. No problem, the …

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Re: Starting a project. Pentium Pro 200

Posted on 2021-02-04, 13:04

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried a Ppro-200/256 under DOS and though my consequence about its performance was "it's nothing special compared to a similarly clocked PMMX " (despite being vastly different) I still think the Ppro is a cool looking and otherwise very interesting CPU so yeah, go ahead, you can't go wrong with it …

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Re: Register settings for various CPUs

Posted on 2021-01-31, 08:06

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I necropost the thread to thank you feipoa for figuring out these settings. And report that my Quake timedemo went up from 19.3 to 20.6 fps with your guidance. I don't even know what clock it's running at, though. It's a BGA 180MHz piece but BIOS insists the board drives it at 200MHz. And every …

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Re: Memory not working together but works individually

Posted on 2021-01-30, 04:12

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have hou tried them with relaxed timings? I'm not sure of course, 133MHz isn't THAT much but one of my P3B-F boards can not do 150MHz wit 1 stick with tightest timings (140 is okah though) and the other is very picky about it, taking only a fes pairs of the many sticks I've tested at 150MHz. Along …

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Re: CPU collectors: do you collect each and every revision or just one?

Posted on 2021-01-22, 03:16

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Miphee wrote on 2021-01-16, 21:49: But people who only collect CPUs will always love the 775 package. I don't. They can't be stacked in the showcase because the stacks tend to fall apart thanks to the asymmetric SMD arrays on the bottom. I'd say 775 CPUs are unstable 😁

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Re: 486DX PC running really slow. Thoughts?

Posted on 2021-01-19, 18:14

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by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rmay635703 wrote on 2021-01-19, 16:31: Sadly Intel insisted on this holy terror CF39475D-45CD-4568-B19A-39CB9AA5DF3E.png What a beautiful and pointless chip, definitely missing from my collection...

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Re: 486DX PC running really slow. Thoughts?

Posted on 2021-01-19, 12:35

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On some PCI boards, the Intel DX 50 can even run at 66 MHz. Admittedly, my sample size of one single DX 50 isn't very meaningful :) No problem, even one data point can prove that something's possible. It can't tell you how common it is, but it's certainly possible. Heck, I had to get 3 pcs of 300A …

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Re: 486DX PC running really slow. Thoughts?

Posted on 2021-01-19, 07:39

by

by alvaro84

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wasn't there also an unstable non-doubled 40MHz as well at one point? Not by Intel. Intel's try was the single speed 50MHz variant. AMD and Cyrix had 40MHz models. Their stability depends on how the motherboard and (VLB, sometimes PCI) cards handle the 40MHz bus. And yes, 50MHz is an even more …

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