Re: the Penultimate Semi Vintage Windows OS

Posted on 2023-09-19, 09:31

by

by tauro

in Milliways

in Milliways

kant explain wrote on 2023-09-19, 01:57: What's the best OS for lessay 1998 - 2007 machines. XP SP3 32-bit with a S775 P4 Cedar Mill or some C2D, 4GB (2x2GB) ram. Everything you throw at it will run butter smooth. Maybe some 98/99 software could be problematic, but probably most things can be fixed …

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Re: Setting the L2 to WT instead of WB, CY5x86

Posted on 2023-09-19, 00:19

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The not the fastest 486 but it's not far. That's one of the fastest Socket 3 CPU (only the 133MHz version is faster), but it's not exactly a 486, it's closer to a Pentium :wink: The fastest proper 486 is the AMD Am5x86, and it can run at 160MHz easily, some at 180MHz and far fewer at 200MHz... …

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 23:57

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have much less PPGA P-MMX processors, and only one of them is fake (SL23W). https://www.vogons.org/thumbs/26505_f42bdab9654fd0e6948aee74d4667b3b/sl23w.fake.jpg I could tell because they marked it wrongly as 233MHz when in fact it should be 200MHz. And more importantly, the letters are VERY DIM and …

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Re: Setting the L2 to WT instead of WB, CY5x86

Posted on 2023-09-18, 23:22

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay, that make sense, so the CPU WB support is not related to the L2. CTCM still say that the L1 is Write-back too with the 486/486DX4 settings. But for some unknown reason, now it does not crash anymore when I set the L2 to 0WS/0WS instead of 1WS/0WS. Ali1429G magic :D On a 486: The CPU has cache …

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 22:22

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As you may have already noticed, the fake chips have an extra coat of paint of a slightly different color that can be noticed if you look at the processor's edges: comparison.sides.jpg And the typography/fonts on the top of the CPUs is slightly different too. Moreover, if you touch the surface with …

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 22:03

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SY027 ORIGINAL Filename SY027.1.jpg File size 1.54 MiB Views 171 views Filename SY027.2.jpg File size 1.33 MiB Views 171 views Filename SY027.side.jpg File size 1 MiB Views 171 views

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 22:01

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SY022 I think this one is a FAKE but the coat of fake paint is more or less intact. Filename SY022.jpg File size 1.72 MiB Views 174 views Filename SY022.side.jpg File size 832.8 KiB Views 174 views Filename SY022.side2.jpg File size 1.12 MiB Views 174 views

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 21:58

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I took some pictures and these are the best tips I can give you to tell which chips are original and which are fake. First I'll upload the pictures and then I'll point out the differences which will become apparent. SL24R FAKE Filename SL24R.1.jpg File size 1.48 MiB Views 185 views Filename …

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 21:54

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It depends, both Ezra-T and Nehemiah can outmatch a Pentium MMX in terms of flexibility when paired with a suitable motherboard that has a compatible PLL where RayeR's SMB can be used to switch the FSB on the fly in DOS. This is in addition to the slowdown capabilities available with SetMul. I …

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Re: M919 DMA on Windows 98SE

Posted on 2023-09-18, 20:30

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The UM8886BF has the bit set in its PCI configuration space as if it supports bus mastering, but it doesn't support the Intel Triton-compatible PCI Bus Master IDE Controller specification described here: https://pdos.csail.mit.edu/6.828/2018/readings/hardware/IDE-BusMaster.pdf which is what the DMA …

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Re: Pentium MMX time machine - Experiences + Questions

Posted on 2023-09-18, 19:13

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SETBLASTER wrote on 2023-09-18, 19:08: ill take some of my pentium CPUs, take pictures of all of them side to side, and maybe you can tell me just by looking at them, which are fake and which are the real deal. Sounds like fun! I'll take mine out too and see if I can show you more about what I'm …

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M919 DMA on Windows 98SE

Posted on 2023-09-18, 19:05

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello friends, I was doing some tests with this board and I couldn't get Windows 98 SE to boot once I enable DMA. I'm using the on-board IDE controller, Intel DX4, 33MHz BUS. Der Sammler reported that setting the L1 to WT would fix it (jumper JP8A) but it doesn't help for me. I tried all the BIOS I …

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Re: Fake painted Pentium CPUs

Posted on 2023-09-18, 18:33

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i still cant find a reliable tutorial on how to detect fake cpus from that era with pictures and everything for example on this topic it is mentioned that the fake cpu had a darker color ceramic while the original has like a light color ceramic while other people say that the light colores ceramic …

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Re: Powering CF Adapters

Posted on 2023-09-16, 19:09

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It depends on what kind of connector your CF-IDE adapter has. I have some that use a standard molex connector, and some use the mini molex connector. In that case, you could use an adaptor like this one https://www.amazon.com/Kentek-Y-Splitter-Internal-Computer-Adapter/dp/B07KS5SDZN You could make …

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Re: Best BIOS for PC-Chips M919?

Posted on 2023-09-16, 17:41

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

- CTCM doesn´t report correctly here, if you run "cachechk" you see the MBs that don´t get cached: 56-64MB. All the rest is o.k. This probably is some BIOS bug... Doesn't the message "56 Mbyte, Cache Area < Main memory!!" mean that? I'm using CTCM 5/98 v1.6n It's surprising that they didn't test it …

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Re: Bios for Citygate Harris 286 motherboard

Posted on 2023-09-15, 20:42

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello everybody! Recently I got this board. It has the classical VARTA leakage but it looks well. Here's my BIOS dump. Filename td60k.bin.zip File size 38.85 KiB Downloads 6 downloads It has a different checksum than those who have been uploaded so far. Perhaps it will help other users, let me know …

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Re: Best BIOS for PC-Chips M919?

Posted on 2023-09-15, 17:17

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by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At the moment I´m experimenting with different BIOS files for my M919 V3.3B/F. I replaced the 4 x 30-pin SIMM sockets with 2 x 72-pin sockets, because 72-pin sticks are cheaper and because I would like to have 256MB EDO RAM. It´s basically a 3.4B/F now and I can keep the fake "Write Back" cache …

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Re: M919 cache max safe voltage

Posted on 2023-09-14, 12:11

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The Toshiba chip is rated for 3.0 - 3.6V, so overvolting it by 20% would mean operation out of specs. I guess it´s similar for the Samsung chips. I'm under the same impression. It would be out of specs but they should tolerate 4v, I guess. If you can replace any defective chips yourself - just run …

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Re: M919 cache max safe voltage

Posted on 2023-09-09, 15:57

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The two transistors of the VRM circuit are working parallel for the same CPU core-voltage. This voltage is also feeding the "COAST slot". If you set the VRM to 4V, the cache chips will operate with 4V also. This board has only one transistor and an empty space... I suppose that means that it can …

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M919 cache max safe voltage

Posted on 2023-09-09, 14:13

by

by tauro

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I finally got this cache module: cache.jpg According to what I've read this module (01S3) is for 3.3v CPUs only. Does that mean that the cache modules get the same voltage as the CPU? Sometimes I do some testing and set my 3.3v CPUs to 4v... will the cache chips also get 4v? if so, will they …

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