Re: Looking for a VGA-USB KVM

Posted on 2020-09-19, 05:07

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm using one of these. Good thing about it is that it can run off from USB from any hosts, and no external power brick is needed. And it's cheap too. Filename kvm usb.jpg File size 80.26 KiB Views 93 views

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win9X Retro Gaming

Posted on 2020-09-13, 12:49

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It is really a challenge to find the datasheets for these chipsets. I could only find 2, the KT133 and AMD761. In these datasheets, the info doesn't match. Fot KT133, register D5 of the host bridge is defined as "reserved", and no further info is available. For AMD761, register 44 is "BIU control" ( …

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win9X Retro Gaming

Posted on 2020-09-13, 12:25

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@Falcosoft Do you know what registers are these referring to? I assume they are pci config registers since they are related to the chipsets, but which device is it? Is it the host bridge config space? xp mul.jpg I am testing using a KM400 board (which is KT400 with video), and dumped the config …

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win9X Retro Gaming

Posted on 2020-09-09, 05:50

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by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@Falcosoft, Thanks for the great info! I'll check it out.

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win9X Retro Gaming

Posted on 2020-09-09, 03:49

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, I've made the same observation on my socket-A XP motherboards (Asus A7V600-X, Epox EP-8KMM3I) during testing too. It is not a program bug but the issue of whether the motherboard supports the mobile CPUs (Mobile Athlon 4, XP-M, mobile Duron, Geode NX etc.) The desktop socket-A motherboards …

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Re: Pentium 3 system - Installing IDE DVD-RW drive causes BIOS to fail to see any hard drives. Stumped.

Posted on 2020-09-05, 05:18

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are the 2 HDDs on one channel and the DVD drive on the other?

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Re: Using an ISA VGA card on an AVR

Posted on 2020-09-03, 11:53

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by kalohimal

in Marvin \ Video

in Marvin \ Video

Yes with a disassembler (e.g. debug.exe in DOS) you could easily take a peek at the BIOS init code too. And with a microcontroller you can set up the output latches before issuing the memory or i/o read/write strobe no? Since VGA cards are mostly 16-bit native, I would prefer to make the conversion …

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Re: Using an ISA VGA card on an AVR

Posted on 2020-09-03, 11:39

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by kalohimal

in Marvin \ Video

in Marvin \ Video

disagree mostly because vga chipsets are complex things and you dont know what the bios on them sets up with things like ram detection and timings, setting up the ramdac if its external. VGA BIOS is not doing some voodoo magic, and it's really not that difficult to perform the initialization. Here …

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Re: Using an ISA VGA card on an AVR

Posted on 2020-09-03, 08:34

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by kalohimal

in Marvin \ Video

in Marvin \ Video

Imho it seems like you're taking the difficult route of using libx86emu library, as you'll then need to deal with any incompatibility issues. Instead of relying on the card's bios, the simpler way would be to perform the initialization directly via registers programming and ignore the bios …

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Re: Did PC-Chips ever release a high quality motherboard?

Posted on 2020-09-03, 06:58

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by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think PC Chips reputation was ruined by their use of fake cache on 486 boards back in the days, while trying to mislead consumer by modifying the BIOS code to show cache as real. It wasn't so much on reliability/stability of their boards, though their boards could range from good to cheap builds. …

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Re: Intel VS440FX - How to connect wired internal speaker?

Posted on 2020-09-03, 04:39

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Erm of course you need the ground, I was referring to the signal. The jumper is to route the signal from pin 26 to 27 to the internal speaker (or vice versa depending on how it's wired up). If the signal is not present on pin 26/27 but is wired to the internal speaker directly, then adding/removing …

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Re: Intel VS440FX - How to connect wired internal speaker?

Posted on 2020-09-03, 04:10

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by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hmm but if the internal piezo speaker could be enabled/disabled by the jumper across pin 26 & 27 of J10H1, isn't the signal already available on pin 26/27 already?

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Re: Need help identifying surface mount cap

Posted on 2020-09-03, 03:59

by

by kalohimal

in Marvin \ Video

in Marvin \ Video

The caps look ok visually. Have you tried changing the thermal compound? Sometimes it dried up and would cause such problems too.

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win9X Retro Gaming

Posted on 2020-09-01, 07:32

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by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can use CrystalCPUID in XP.

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Re: SSD hotswap bay for Floppy Drive enclosure

Posted on 2020-08-31, 08:47

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by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes but I've only seen it on Aliexpress and it't not cheap.

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Re: How do YOU mount your CF2IDE card?

Posted on 2020-08-30, 06:56

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CF adapters - attach to cable type, plug directly into motherboard type, dual CF type, back plate type, I have ‘em all. I personally prefer the back plate type, as the card could be easily removed for files transfer from a modern PC. It doesn't really protrude that much out from the back, and more …

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Re: Motherboard won't power on - Help?

Posted on 2020-08-29, 06:24

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Usually if an HSF comes with a metal back plate, it will have a piece of plastic sheet attached to prevent accidental shorting out the components. Once it is attached, you can wiggle and pull the HSF a bit to see if it is tight enough or loose. This might be asking the obvious, but did you inspect …

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Re: Motherboard won't power on - Help?

Posted on 2020-08-29, 01:45

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CPU fan looks correct (for the old CPU & HSF combo that is). Maybe you could show us some pictures of how the thermal paste is spread and how your new cooler is mounted (both top and bottom)? Those white stuffs in your pictures are just dusts, you can wipe them off with cotton bud + alcohol. If the …

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Re: SD card to IDE adapters

Posted on 2020-08-28, 18:30

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

These are Sintech ones, I have 2 and use them all the time. The chip in your photo is not Sintech though, most probably a clone. The rest of the board is exactly the same. Compatibility is quite good. It works with almost all my boards (I have close to 100) of various platforms (Intel & AMD from …

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Re: Help me understand how to wire custom Turbo Switch

Posted on 2020-08-28, 09:33

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So in other words, your connection should look something like this: tbsw.jpg So when the turbo switch is off (down), the centre pole connects to the bottom throw, all segments on your turbo panel connected to the bottom pin will be pulled to ground, and this is the "turbo switch off, segment on" …

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