Re: 486 cache/ram speed issue with write-back

Posted on 2019-09-28, 14:58

by

by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I like datasheets. I think I've been able to enable WB with dirty bits using a DOS program. Check it out... This board has a voltage regulator and accepts DX4 CPUs natively, so I would assume I'm running at 3.3 or 3.45V, it's not user configurable but the board does mostly everything automatically …

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Re: 486 cache/ram speed issue with write-back

Posted on 2019-09-26, 12:54

by

by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you using a CPU interposer? I don't believe this board has configurable CPU voltage, so be aware that plugging a 5x86 in directly will supply 5V instead of the correct 3.3V (or was it 3.45V?) I use a Trinityworks 5x86 module in this board, and it works at 133MHz with write-back L1 with the …

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Re: GRUB4DOS help needed to boot NT4 from DOS

Posted on 2019-09-21, 19:22

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by bakemono

in Marvin \ Software

in Marvin \ Software

OK, so I got the aforementioned version of NTDETECT. For this one the patch should look like this:

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Re: GRUB4DOS help needed to boot NT4 from DOS

Posted on 2019-09-21, 08:02

by

by bakemono

in Marvin \ Software

in Marvin \ Software

Glad to hear this effort has some success. Bakemono, for this same system, I also have a CF-to-SCSI card reader which as Win95c/NT3.51 on it (no NT4). I'd like to modify just the NT3.51 NTDETECT.COM as well. It is the same size file, but has a slightly different date of Sept 19, 1996. Do I modify …

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Re: GRUB4DOS help needed to boot NT4 from DOS

Posted on 2019-09-20, 12:54

by

by bakemono

in Marvin \ Software

in Marvin \ Software

Instead of changing the file directly, I would recommend making a backup copy and then edit that one. Then you can swap the files as needed while you're in DOS, before starting GRUB. (That is, assuming your NT4 partition is accessible from DOS) To edit the values you should be able to click on a hex …

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Re: Quad Pentium 3 Xeons/eight Pentium 3 Xeon benchmarks???

Posted on 2019-09-20, 12:34

by

by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

While looking into this issue I got as far as trying to download it and my virus checking software reported it contained threats! I'm not suprised that an unofficial patch which replaces system files would trigger anti-virus heuristics. Nobody else should be either.

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Re: Quad Pentium 3 Xeons/eight Pentium 3 Xeon benchmarks???

Posted on 2019-09-20, 08:56

by

by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In my experience, adding more cores in Win2000 makes single-threaded performance go down. Threads keep shuffling from one core to another and cached data that changed probably has to be reloaded. This is from my comparison of Athlon/Phenom X2 and Phenom X4 CPUs in the same system. It would be cool …

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Re: GRUB4DOS help needed to boot NT4 from DOS

Posted on 2019-09-20, 05:17

by

by bakemono

in Marvin \ Software

in Marvin \ Software

feipoa wrote: NTDETECT.COM is 26,800 bytes in size with a date of October 14, 1996, 1:38:00 AM Try to patch these five bytes. It should cause NTDETECT to always detect a PS/2 mouse. I tested this on my NT4 laptop with (normally working) built-in PS/2 trackpad and it continued to work there at least …

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Re: GRUB4DOS help needed to boot NT4 from DOS

Posted on 2019-09-19, 10:27

by

by bakemono

in Marvin \ Software

in Marvin \ Software

It is starting to make sense now. NTDETECT test the int 11h flag, and then it tries int 15h function C2. Maybe if the PS/2 mouse flag is clear, it assumes there is no mouse port. Moving the mouse causes unexpected data to arrive at the port and causes a hang (mouse and keyboard both use port $60, …

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Re: GRUB4DOS help needed to boot NT4 from DOS

Posted on 2019-09-19, 06:39

by

by bakemono

in Marvin \ Software

in Marvin \ Software

NTDETECT.COM never calls int 0x74. It does call int 0x11 and test bit 2. I wonder if that is the only issue preventing it from detecting the PS/2 mouse. PS2SUPPC also does a bunch of port I/O and I'm not sure if it is only for detection or if there are necessary steps for resetting/configuring the …

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Re: Bios Hunt: GENOA 486VLG - X4

Posted on 2019-09-12, 21:04

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

here is my dump 😀

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Re: Need help with Mach 32 Graphics Wonder VLB BIOS

Posted on 2019-09-12, 09:27

by

by bakemono

in Marvin \ Video

in Marvin \ Video

VGA WONDER is what it says inside the BIOS, so I'm not sure. Here is a pic of the card

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Re: Need help with Mach 32 Graphics Wonder VLB BIOS

Posted on 2019-09-11, 21:09

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by bakemono

in Marvin \ Video

in Marvin \ Video

I have a BIOS from ATI VGA WONDER, 1MB Mach 32 VLB

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Re: Bios Hunt: GENOA 486VLG - X2

Posted on 2019-09-11, 21:03

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a Genoa X4 with Nov 94 BIOS date. But I use a VLB EIDE card with it's own BIOS and only have a 2.5GB Quantum Fireball connected so I haven't encountered the disk geometry limits. What IDE interface are you using? Maybe XT-IDE BIOS would help? Can't Linux bypass BIOS limits by using it's own …

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Re: Can watch 1080 on Pentium III?

Posted on 2019-09-07, 03:39

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

why 12 bits per pixel on raw frames? Chroma subsampling. YUV12, 4:2:0, or whatever it's called. I agree with previous posters that PCI bus bandwidth is likely a limiting factor here. 133,000,000 bytes/sec is the theorettical max, with a continuous burst, no time for other devices on the bus, no …

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Re: Low speedsys memory bandwith throughput on high end motherboards

Posted on 2019-09-06, 05:32

by

by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have also seen the situation where memory benchmarks are higher when cache is disabled. Some chipsets suffer extra latency when there is a cache miss. But sometimes this only happens when the L2 is set to Write-Back, but not on Write-Through. 100MB/s is pretty high for socket 3.

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Re: Can watch 1080 on Pentium III?

Posted on 2019-09-06, 04:58

by

by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah but PCI GPUs have driver issues we tried once with a HD4350 and a 8400GS.. and it didnt work very well at all. But if you have PCI-X and a PCIe Adapter... There is a PCI version of GeForce 210, maybe that would work? The normal PCIe version has accelerated video decoding (even in Windows 2000 …

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Re: Any way to run a DOS TSR program before loading Windows NT 4.0?

Posted on 2019-09-02, 14:19

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is it actually a driver or does it just modify a flag in the BIOS data area or something like that? Adding small pieces of code to a boot sector doesn't take much work. You have to swap out an instruction or two somewhere with a CALL or JMP that goes to your new code (which must include the …

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Re: Need help to improve the support of 486/586/686 class CPUs in CPU-Z

Posted on 2019-08-29, 09:19

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CuPid wrote: - UMC8881 support (for L2 cache). I posted some info on UMC 888x a while back that may be helpful if you want to add more details Re: What retro activity did you get up to today?

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Re: Pentium II Dixon... what speed it has?

Posted on 2019-08-28, 17:26

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Articles at the time stated that the 256KB on-die cache tended to perform better than the 512KB external cache, and obviously it would be an improvement over mendocino. Not as fast as coppermine though because the L2 on those is connected with a wider bus for lower latency.

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