Re: FPM or EDO

Posted on Today, 17:09

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I saw a post from someone on Vogons (could have been you for all I remember) that also said there's no EDO 30 pin SIMMs. But someone on eBay sells them! However they appear to be new assemblies. Wonder what people buy them for? I accidentally bought those for a 386 and of course it didn't work. …

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Re: Cyrix 5x86 on older 5V-only 486 motherboards

Posted on Today, 17:02

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I see support for up to i486DX2, IBM486SLC2, and Cx486S2. So no Cx486DX/DX2/DX4 or Cx5x86 support. Did you try running a Cx486DX or Cx486DX2 on this board? It will take me a while to do a detailed analysis. I’ll report back when I have more information. Jan I haven't dug into it but--with those old …

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Re: How to get and validate DMA mode for disks in Windows 3.1?

Posted on 2024-05-31, 12:56

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ECP parallel ports include support for a FIFO buffer; could it tbe that?

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Re: Are modern keyboards safe to use on vintage PCs?

Posted on 2024-05-30, 03:13

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Worth mentioning that Unicomp still offers traditional keyboards, if you're ok with buckling spring (clicky). At the moment they only have USB due to a component shortage, although they told me they intend to have PS/2 again in the future.

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Re: Someone got xp sp3 running on a 486

Posted on 2024-05-25, 04:48

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by jakethompson1

in Marvin \ Software

in Marvin \ Software

Jo22 wrote on 2024-05-25, 04:47: Maybe it could be run on a plain 386, even, not sure. Many binaries have XADD instructions in them which would break them on a 386

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Re: Is it safe to connect to internet under Windows 95 or 98SE?

Posted on 2024-05-25, 04:38

by

by jakethompson1

in Marvin \ Software

in Marvin \ Software

PS: Btw, is it just me or is the nostalgia for 98SE general ly a bit stronger than that of Win95? I remember Windows 95 from when it was new, I've even used it on my father's PC early on. But for some reason, to me, merely Hover and the Win95 Setup wallpaper (setup.bmp) are causing strong emotions. …

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Re: Starting up a new Dallas RTC chip

Posted on 2024-05-24, 21:33

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So if a BIOS really would clear the CMOS based on the "low battery" bit, it would clear the CMOS on every reset, even with uninterrupted mainboard power. This does not match my experience with 486/Pentium boards. Thanks for the explanation. There are definitely some boards that work this way, where …

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Re: Starting up a new Dallas RTC chip

Posted on 2024-05-24, 20:18

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And finally, about starting up: It is never required : If the oscillator is not enabled, the oscillator-enable bit is enabled on power-up, and the device becomes immediately accessible. The datasheet refers to applying the +5V from the PC power supply as "power up". This by itself is enough for the …

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Re: Video stutter and shadow ram (Dos 6.2)

Posted on 2024-05-22, 23:58

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Interesting. I look forward to seeing others' ideas. Does your BIOS have ISA 16-bit & 8-bit wait states that can be increased? Disabling video BIOS shadowing seems like it would have the effect of breaking up consecutive bus accesses for the sound card, so maybe wait states would accomplish …

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Re: Need support with 286 computer stuck in award bios code 03

Posted on 2024-05-21, 23:33

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you can dump the BIOS image (or find something very close online) someone could disassemble it and ideally narrow down what happens between 03 and 04

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Re: Is it safe to connect to internet under Windows 95 or 98SE?

Posted on 2024-05-19, 21:22

by

by jakethompson1

in Marvin \ Software

in Marvin \ Software

It's not "safe" but ultimately the only difference is if someone reports to MS a vulnerability in Windows 10, they will patch it, whereas if someone discovers something in Windows 98, they won't. Firewalls, routers, etc. aren't necessarily relevant either. See pp. 15-16 for a demo of what could …

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Re: Most powerful Mainboard with Floppy + IDE

Posted on 2024-05-19, 21:17

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a reason you need it built into a motherboard? You can get a PCIe 1x IDE adapter for under $25 USD. For floppies, 3.5" USB floppy drives are fine, but if you are concerned, there are USB to floppy board you'd then connect a known quality drive to to read the disks. 5 1/4" floppy adapters …

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Re: Most powerful Mainboard with Floppy + IDE

Posted on 2024-05-19, 00:11

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a reason you need it built into a motherboard? You can get a PCIe 1x IDE adapter for under $25 USD. For floppies, 3.5" USB floppy drives are fine, but if you are concerned, there are USB to floppy board you'd then connect a known quality drive to to read the disks. 5 1/4" floppy adapters …

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Re: Most powerful Mainboard with Floppy + IDE

Posted on 2024-05-17, 21:41

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have an ASRock 980DE3/U3S3 R1 (Socket AM3+)

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Re: 386 dram 0 wait state causes no boot, cache related?

Posted on 2024-05-07, 04:56

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It looks like you have a UM481 board. I also ran into that issue where the memory has to be backed off from 0 WS to 1 WS in order to operate with cache enabled. I also suspect you have an "always dirty" configuration as mkarcher mentioned above. You can read more about it here https://www.vogons.org …

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Re: Looking for a tool which describe MZ, NE, LE, LX, PE executable header content

Posted on 2024-05-06, 15:05

by

by jakethompson1

in Marvin \ Software

in Marvin \ Software

Extensive File Dumper linked on this page https://hex-rays.com/documentation/

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Re: Windows 98SE 486 requirement

Posted on 2024-04-27, 03:14

by

by jakethompson1

in Marvin \ Software

in Marvin \ Software

OK, so the limitation is totally artificial, thanks all! It isn't completely artificial: https://devblogs.microsoft.com/oldnewthing/20040506-00/?p=39463 Windows NT 4 dropped support for the 80386 processor, requiring a minimum of an 80486, so it could take advantage of this instruction. Windows 98 …

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Re: UMC IDE/EIDE controller datasheets

Posted on 2024-04-20, 02:48

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

5,753 KB/s using BIOS PIO mode 4 setting and no driver 6,607 KB/s using UM8673.SYS /D0:17 /NF0 /SM0 10,779 KB/s using UM8673.SYS /D0:17 /F0 /SM0 13,900 KB/s using UM8673.SYS /D0:16 /F0 /MM0 Just wanted to update on this... My HOT-433 is a revision 3 I believe but it has the UM8886B... I did some …

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Re: Hex editing a game exe - How do you figure out which parts represent what?

Posted on 2024-04-06, 03:37

by

by jakethompson1

in Milliways

in Milliways

Are all, more complicated, game exe fixes really made with that method? There are a lot of mods out there that patch the exe. I don't imagine most modders have that level of coding knowledge... or do they? Is this a DOS game or a Windows game, and what do you mean by Vert-? 32 and 64 bit Windows …

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Re: Drive bay extinction in cases, PC chassis, accelerating ???

Posted on 2024-03-22, 04:08

by

by jakethompson1

in Milliways

in Milliways

The problem is they get mocked in reviews if they have drive bays, either for being outdated or for having all that "wasted space" occupied by a drive cage when you could put more fans there

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