Re: Powering old graphics cards via the IDE/SATA labeled connectors of a modern PSU?

Posted on 2020-09-28, 17:53

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you are adapting SATA connectors: each SATA pin should be rated for 1.5A, 3x5V pins =4.5A (22.5W), 3x12V =4.5A (54W). But total current should not exceed 7.5A (there are only 5 ground pins). If PSU has standard Molex connectors they should provide more amps.

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Re: GT520 PCI compatibility

Posted on 2020-09-27, 15:50

by

by adalbert

in Marvin \ Video

in Marvin \ Video

I installed that card in SiS530 mainboard If it's AT board, you're out of luck. It's ATX board, Shuttle HOT-599 http://www.motherboard.cz/mb/shuttle/HOT-599.htm. Maybe i should try putting more memory there, I only had 64 MB when I was testing it. I should probably also check if it's detected by …

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Re: PCMCIA boot support on PC laptops

Posted on 2020-09-27, 10:03

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This 3.3V/5V issue is interesting. If you have any photo/HOWTO regarding this, I would like to see it. It would be nice to be able to use CF cards in this laptop. All right, i found it :) you just need to disconnect Pin 43: VS1/RFSH and Pin 57: VS2/RFU. I desoldered them and put some insulating …

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Re: PCMCIA boot support on PC laptops

Posted on 2020-09-27, 01:20

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PCD-4ND was also my first laptop back in late 90s (it was already old), i have it now too, but not the same unit :) actually I didn't know that you can boot from PCMCIA with it. But I fixed CF-PCMCIA problem some years ago (to use that card with Windows), I figured out that PCMCIA can use 3.3V and …

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Re: Is it safe to use a low noise adapter on a gpu fan from a geforce 4 ti 4200, long term?

Posted on 2020-09-26, 21:32

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by adalbert

in Marvin \ Video

in Marvin \ Video

I just cut the red wire in my Ti4200, soldered a resistor (actually two 1/4W resistors in parallel, so they won't heat up so much as one resistor would) and put a shrinkwrap on it. The resistance was in 10-30ohm range, I don't remember exact value. It was 5 years ago when such cards were cheap and I …

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GT520 PCI compatibility

Posted on 2020-09-26, 21:10

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by adalbert

in Marvin \ Video

in Marvin \ Video

I installed Zotac GT520 in PCI slot of Tualatin Pentium 3 build. I performed some tests under Windows 7, 3dmark2001 score was kind of dissapointing (less than 7000 pts, AGP GF4Ti was much better), but maybe under Windows XP would perform better. But the most interesting part was hardware video …

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Re: Replacing an AT power supply with a 3.3V rail

Posted on 2020-09-21, 16:11

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can use ATX power supply with AT adapter and make additional 3.3V connector (orange wires).

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Re: How to power this ISA backplane computer?

Posted on 2020-09-19, 22:02

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are screw terminals marked by the arrow. You need to attach wires with proper voltage to them. You could use AT, ATX or custom power supply. Simplest, but destructive (for power supply) way: use old ATX (or AT) power supply you don't care about and strip the wires. Match colors of wires. …

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Re: Photographing processor silicon - starting with a Pentium Pro

Posted on 2020-09-11, 14:49

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Nice! After seeing these photos I started to wonder how likely is the CPU to work after exposing the die. Here is one video with 486 that supposedly works, and it's even not in clean environment https://www.youtube.com/watch?v=3L03k21RDhE I was thinking about using apple watch tempered glass screen …

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Re: Anyone know where to find ATX 20 pin -5v adapters in 2020?

Posted on 2020-09-03, 20:39

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by adalbert

in Marvin \ Sound

in Marvin \ Sound

You could also use this module, solder GND to GND, +5V to VIN and it will output -5V on -VOUT pin https://www.ebay.com/itm/LM2662-Switched-Capacitor-Positive-to-Negative-5-5V-200mA-Voltage-Converter/114190379944 you could also add a capacitor (100uF or larger electrolytic rated for 10V or more) on …

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Re: Programming on DOS/Windows 95/98

Posted on 2020-09-01, 23:48

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by adalbert

in Marvin \ Software

in Marvin \ Software

I only have some experience with rapid GUI application development, Borland C++ Builder 1.0 - not open source but old CDs are available for 10-20USD (license is bonded to the disk so if you own it you can use it), IDE works natively on NT 3.51 and 95, you can target Windows 3.11 with win32s addon. …

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Re: Thinkpad 701cs with cracked hinge

Posted on 2020-09-01, 19:02

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've had good luck with superglue only when glued parts didn't receive any mechanical stress (like glueing a decorative panel to a case). When there was any kind of flexing involved, parts would separate very quickly and it would be hard to clean off the remaining glue before trying something better …

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Re: Thinkpad 701cs with cracked hinge

Posted on 2020-08-30, 20:58

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here you can look up some hardcore methods for case restoration: https://retrohax.net/commodore-sx-64-keyboard-restoration/ do you have a photo?

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Re: Uncommon mini pentium3 motherboard

Posted on 2020-08-30, 13:07

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Those small components are SMD fuses. Most likely for keyboard and USB ports. Shouldn't be critical for the board to work. But i wonder why were they replaced, maybe just some faulty USB device was plugged in. Similar small board is Chaintech 6via5t if you are interested in finding more like this …

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Re: 1990's laptops with good screens?

Posted on 2020-08-29, 23:59

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anonymous Coward wrote on 2020-08-29, 23:45: Maybe there are good ones compared to what the competition was offering, but colour reproduction was an issue with LCDs until at least 2010. Well, that's true. But difference between DSTN screens like this one: Filename sni-14.jpg File size 864.28 KiB …

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Re: 1990's laptops with good screens?

Posted on 2020-08-29, 22:42

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's hard to predict the quality of whites because it depends on the ageing of fluorescent lamp. But all laptops with TFT screens ("active matrix") are superior to everything else. STN screens are a joke and are totally useless for games or multimedia. But they could be even $1000 cheaper ( …

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Re: List of open-source PC hardware projects

Posted on 2020-08-28, 23:08

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

reserved

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List of open-source PC hardware projects

Posted on 2020-08-28, 23:08

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is a list of some open-source hardware projects (with schematics, PCB files, firmware, etc. so you can build them or modify them by yourself) I will try to update that list with new projects linked in this thread. Sound cards thread: https://www.vogons.org/viewtopic.php?f=62&t=68265 SD card to …

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Re: Switching between internal and external Ethernet connection with passive splitter? (internal wifi router)

Posted on 2020-08-28, 16:50

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I already have this https://openwrt.org/toh/unbranded/a5-v11 flashed with OpenWRT and it works fine for me. Regular router won't do because i'm putting this inside T3200SXC laptop :) i will get +5V directly from the network card and the router will be piggybacked with RJ45 connector desoldered. You …

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Switching between internal and external Ethernet connection with passive splitter? (internal wifi router)

Posted on 2020-08-28, 12:41

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would like to solder an OpenWRT wifi module to 3C509B ISA card https://www.vogonswiki.com/index.php/3Com_3c509 so the machine would be able to connect to wifi through internal network card and packet driver. But I would like to retain the ability to connect external network cable (not …

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