Re: Posts photos of your most unique build.

Posted on 2020-08-25, 18:08

by

by adalbert

in Marvin \ System Specs

in Marvin \ System Specs

That's a really cool case! How did you build it? Thanks :) I used 3mm thick HIPS sheets, 20x30cm in size, sides are made of entire uncut sheets, and I cut top, bottom and front to adequate size. This is done by hand, by cutting the sheet few times and breaking it. I 3D printed ventilation cover and …

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Re: What are the best Vga to hdmi scalers or peripherals for MS-DOS games ?

Posted on 2020-08-25, 17:53

by

by adalbert

in Marvin \ Video

in Marvin \ Video

Are you considering the VGA to eDP monitor controller because you have an HDMI device that you could use ? If that is the case, one of the small and inexpensive VGA 70Hz to HDMI 60Hz converters mentioned earlier by Prez might work for you (though no guarantees it would not cut or improperly …

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Re: What are the best Vga to hdmi scalers or peripherals for MS-DOS games ?

Posted on 2020-08-25, 13:08

by

by adalbert

in Marvin \ Video

in Marvin \ Video

I'm just looking for any solution that would allow capturing VGA output of any quality , doesn't matter if it's scaled or not, it just needs to 1) be an complete image, no cropped out parts 2) work with every resolution without the need of manual adjustments 3) not cost 300 USD and be small enough …

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Re: What are the best Vga to hdmi scalers or peripherals for MS-DOS games ?

Posted on 2020-08-25, 09:52

by

by adalbert

in Marvin \ Video

in Marvin \ Video

Couldn't this (VGA to eDP LCD controller) https://aliexpress.com/item/33061411194.html + DP to HDMI adapter be used?

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Re: VGA Capture Thread

Posted on 2020-08-24, 12:22

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by adalbert

in Marvin \ Video

in Marvin \ Video

I have been using VGA2AV (VGA to RCA) converters and USB video capture cards which are not good quality-wise, but they just work. Unfortunately in DOS the screen is being cropped from the left and right side a little bit, so you don't see C:\> but :\> prompt. I get the same result with two different …

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Re: Differences between Windows 95 OSR 2.1 and OSR 2.5

Posted on 2020-08-17, 16:13

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by adalbert

in Marvin \ Software

in Marvin \ Software

Dplus browser is great for old Windows PCs. It is OK for downloading files, google search etc. Very lightweight. Generally works with modern websites, but removes a lot of formatting, scripts, etc. https://sourceforge.net/projects/dplus-browse … ses/dplus-0.5b/

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Re: What's the success rate of repairing faulty graphics cards?

Posted on 2020-08-17, 13:01

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I only once reballed memory chip by hand without proper hardware and it looked like that... https://drive.google.com/file/d/0B2rbHIj6SMlFZWVTZ0wtTjkxaG8/view to desolder it/solder it I preheated the GPU board (it was laptop gpu) board on kitchen heater (i put it on a metal grate) and then used …

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Re: AT PSU design (question about output overvoltage protection)

Posted on 2020-08-16, 15:46

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Horun wrote on 2020-08-16, 15:28: TI TPS3510P thanks, maybe I will use it and omit the microcontroller 😀 i will look for 5V/12V-only equivalent, but I guess that I could just use a zener, resistor divider or small stabilizer to create a "fake" 3.3V line required for that chip to work. Or maybe even …

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Re: AT PSU design (question about output overvoltage protection)

Posted on 2020-08-16, 12:42

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the sugesstions, Omit the microcontroller, this is central source of crashes and failures. Cheers, I can look for some ICs which are designed to monitor voltages, I've seen some in old power supplies ("housekeeping ICs") but I would need to find something which is easy to obtain. I also …

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AT PSU design (question about output overvoltage protection)

Posted on 2020-08-15, 00:35

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It would be really helpful if someone with actual engineering knowledge could take a look at this design :) I want to include some overvoltage protection. I am trying to design something like pico PSU but for AT mainboards with better +5V line and negative rails. I already made a power supply for …

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Windows 95 floppy install, "file xxx on Windows 95 disk xxx could not be found" (virtualbox)

Posted on 2020-08-13, 16:32

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by adalbert

in Marvin \ Software

in Marvin \ Software

I'm testing Windows 95 floppy images in Virtualbox and first step of installation goes well (it uses 29 floppies 1.44m format), but after rebooting it tries to install network drivers and doesn't see them even if I mount the correct floppy. It gives error "The file 'netapi.dll' on Windows 95 Disk 2 …

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Re: Posts photos of your most unique build.

Posted on 2020-08-12, 11:33

by

by adalbert

in Marvin \ System Specs

in Marvin \ System Specs

Old photo so I probably posted it somewhere already, but it fits the topic since I made this case so it's certainly unique 😁 currently it has K6-2+, Voodoo Banshee and probably ESS ISA Soundcard. I also used this case with 4DPS tomato board. Now there is some kind of SS7 board with similar size.

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Re: Simple passive slotket on 694X dual cpu board for Coppermine/Tualatin?

Posted on 2020-08-12, 10:21

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

More info on basic cumine mod: http://krick.3feetunder.com/370mod/ Thanks, I will try it. B75 is not connected to anything, but I can solder a thin wire to the top side of gold finger (the contact is on the bottom side). You have to find out if your VRM chip supports Coppermine and/or Tualatin …

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Simple passive slotket on 694X dual cpu board for Coppermine/Tualatin?

Posted on 2020-08-11, 23:05

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there any possibility of modding such passive slotket (no voltage clamp chip) for Coppermine or Tualatin CPUs on dual CPU Via 694X board? It supports 100 and 133 FSB (Tyan s1834d), but I don't know what would be the I/O voltage there and if such slotket would work at all. In current state I only …

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Re: Fix stuck pixel on a laptop

Posted on 2020-08-11, 10:25

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I mostly collect old laptops and to be honest, I suggest to stop caring about such defects :) old small LCD panels are often expensive (because they are usually also used as replacemement parts for industrial machines or medical equipment) or difficult to get, and just having a working one is a …

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Re: Connector wiring NCE-860/PC mouse (late 80s serial port)

Posted on 2020-08-08, 01:14

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

All right, so... the wiring was fine all the time! I mean, it worked with another computer. But it was causing something which seemed to be a massive voltage drop on T3200SXC. That laptop worked only with Logitech Mouse Man. I tested two additional mice, and the result was the same (fan and HDD …

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Re: MPU401 output to DAW with modern VSTi plugins?

Posted on 2020-08-03, 17:09

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by adalbert

in Marvin \ Sound

in Marvin \ Sound

Thanks for the answer, I will try with different host. I'm just trying to achive best quality of realtime music playback, although I know it's not that simple because different plugins require different programming and it's not as simple as playing back the notes. Halion manages GM playback pretty …

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MPU401 output to DAW with modern VSTi plugins?

Posted on 2020-08-03, 02:02

by

by adalbert

in Marvin \ Sound

in Marvin \ Sound

Did anyone try routing MPU401 output to DAW software like Cubase and playing general midi sounds with modern virtual instruments? I did some experimenting with dosbox and loopmidi, but I'm getting some problems. Cubase receives the MIDI input, but there are a lot of hanging notes. This is how it …

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Re: Connector wiring NCE-860/PC mouse (late 80s serial port)

Posted on 2020-08-02, 19:25

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I also found a datasheet for the controller (4-bit microcomputer) https://www.digchip.com/datasheets/download_datasheet.php?id=631045&part-number=MB88201 R10/START pin is connected (pin number 5) is connected to the transistor base, collector is connected directly to cable 1 and there is a resistor …

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Re: Connector wiring NCE-860/PC mouse (late 80s serial port)

Posted on 2020-08-02, 10:05

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh, thanks for correcting that, I even was looking at the pinout earlier but neverheless messed it up :) there is no rush with fixing that mouse, I just want to make sure it won't blow anything up while it's connected. I found this site on getting power off RS232 http://www.abcelectronique.com/ …

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