Re: Fabricating a New Turbo Display

Posted on 17 minutes ago

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW speaking of these displays with "MHz" letters: I'd be interested in purchasing several (4-5 units), but with a 3 digit display... I have several pentium 233 and k6-II/III PCs in AT cases with missing MHz displays.... ^this and what we really need are those (attachments) as they are very rare and …

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Re: Fabricating a New Turbo Display

Posted on Today, 11:43

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sure, there are not enough pins so sorry. I even used two 74HC with ATTiny by myself earlier 😁 except I connected 3 digits in parallel to one 74HC, and used another 74HC + transistors for multiplexing.

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Re: Fabricating a New Turbo Display

Posted on Today, 11:18

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hmm, are two 74HC chips necessary here? Couldn't it be simplified further by connecting the displays in parallel (except common pin for power) and switching the power rapidly between digits (200Hz or faster)? That's display multiplexing :) /edit: seems that you even used multiplexing in earlier …

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Re: Strange artifacts on NV1 card... that go away when I touch it?

Posted on 2021-02-20, 22:48

by

by adalbert

in Marvin \ Video

in Marvin \ Video

Did you check for shorts on ceramic caps (or did you replace these too)? They sometimes short themselves out, it happened on one of my slotkets.

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Re: Warning: Leaking BIOS/CMOS/Resume Batteries Damaging Laptops

Posted on 2021-02-20, 14:06

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I will add some to that list. But as was stated earlier, everything that has batteries can be damaged at some point (though I think that mainly Ni-Mh and Ni-Cd are prone to leak, lithium batteries not so much). Laptops with Ni-Mh batteries: Toshiba Libretto 70CT/100CT/110CT (and one of them has …

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Re: Phil’s latest video - Voltage Blaster

Posted on 2021-02-19, 17:31

by

by adalbert

in Marvin \ Sound

in Marvin \ Sound

That design is pretty nice, but you can have problems when you have very weak -12V line. Because a linear regulator wastes the entire voltage drop as heat (efficiency below 42% in that case). To achieve better efficiency -5V could be generated from positive voltage with charge pump like LM2662 or …

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Re: Keep GeForce 4 to cards from dying

Posted on 2021-02-16, 12:52

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by adalbert

in Marvin \ Video

in Marvin \ Video

Working powered mainboard, spark off my finger, no image, dead :P that happened in my case BTW this was a cheap OEM board. Properly designed hardware usually haves some kind of ESD protection, either in internal chip design, or externally like TVS diodes which can absorb ESD. Of course it can still …

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Re: Keep GeForce 4 to cards from dying

Posted on 2021-02-16, 10:57

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by adalbert

in Marvin \ Video

in Marvin \ Video

ESD is not a serial-killing monster, I haven't lost anything to ESD and I haven't used an ESD bag in years. I lost hardware to ESD twice: first time it was SiS 530 mainboard, it stopped working right after a spark went on some data lines, and second time it was Commodore C64 CIA chip, which had one …

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Re: Fun with thermal paste

Posted on 2021-02-11, 20:07

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

debs3759 wrote on 2021-02-11, 19:45: I've found so much paste on some systems that it was UNDER the CPU. Jokes aside, what about SS7 and S370 mainboards which have little temperature sensors under a socket? I never put thermal paste on them, but I guess it would create better contact between CPU …

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Re: Bought these (retro) hardware today

Posted on 2021-02-11, 18:29

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

AOpen i45GMt-HR mini ITX board with mobile dual core, not quite retro, but have you ever seen socketed SPI BIOS chip? I found that quite interesting. This board also has engineer's names printed on silkscreen 😜

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Re: Dual PIII-S Tualatin 1.4GHz, GA-6VXD7 Via 694x, 2GB PC133 CL2, Radeon HD4650. Source games in 1080p

Posted on 2021-02-10, 10:33

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by adalbert

in Marvin \ System Specs

in Marvin \ System Specs

Thanks. BTW I resolved my FSB and voltage issues: FSB switching works fine, I just mistaked JP1 with JP2... :) to fix voltage, i had to bridge appropriate VID pins to ground. I followed the datasheet of mainboard's VRM https://pdf1.alldatasheet.com/datasheet-pdf/view/82527/FAIRCHILD/RC5057M.html It …

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Re: PCI graphics card compatibility with SiS530 chipset

Posted on 2021-02-08, 16:53

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had problems with Shuttle HOT-599 mainboard http://www.motherboard.cz/mb/shuttle/HOT-599.htm I wanted to use iGPU with additional 3Dfx card, but I couldn't get Voodoo 1 or Voodoo 2 to work. First I only got black screen with either card inserted. Then I updated BIOS and I could boot only if Voodoo …

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Re: Dual PIII-S Tualatin 1.4 GHz Success Stories

Posted on 2021-02-08, 13:40

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

HD4650 AGP works fine on 6VXD7 (with pin-modded CPU). I have Via 694x chipsed with AGP 4x enabled in BIOS. The only problem is that GPU-Z (I only tested the most recent version) crashes the PC, but I didn't experience other problems. You can even play Source games in 1080p with somewhat playable …

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Re: Dual PIII-S Tualatin 1.4GHz, GA-6VXD7 Via 694x, 2GB PC133 CL2, Radeon HD4650. Source games in 1080p

Posted on 2021-02-07, 12:40

by

by adalbert

in Marvin \ System Specs

in Marvin \ System Specs

I decided to try Steam, HL2 and CS: Source. January 2019 Steam version works fine on XP, modern versions would probably work with Win 7 installed. Some Source games have SSE2 check, i found it simple to remove by copying filesystem_stdio.dll from legitimate 2015 Garry's Mod copy. CS: Source gameplay …

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Dual PIII-S Tualatin 1.4GHz, GA-6VXD7 Via 694x, 2GB PC133 CL2, Radeon HD4650. Source games in 1080p

Posted on 2021-02-07, 12:40

by

by adalbert

in Marvin \ System Specs

in Marvin \ System Specs

My first working dual Tualatin with Gigabyte GA-6VXD7 (VIA 694X) rev 1.0 mainboard :) Current specs: GA-6VXD7 - needs a recap, but works and is stable Two 1.4GHz SL5XL P3-S 2 GB Kingston PC133 CL2 SDRAM 64GB Sandisk SSD Asus Radeon HD4650 1GB AGP RTL8100 network card XP Pro SP3 Fortron SFX 300W PSU …

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Re: GA-586HX: BIOS chip in the wrong way

Posted on 2021-02-05, 13:33

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I once installed UV-EPROM chip wrong way (in 486 mainboard) and it was damaged, but mobo was fine. You need to buy a compatible chip and have it programmed with BIOS file before you install it (try to find it on the web). You should remove the label and see what the model number is, then buy the …

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Re: USB/PS2/SERIAL optical mouse solutions for 386/486 systems

Posted on 2021-02-02, 23:33

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

https://www.raspberrypi.org/products/raspberry-pi-pico/ This should be the ultimate solution for USB to anything converter! It was just released, costs $4 and has USB host functionality. If only I had time now i would try to make something with it, but maybe someone else will look into it. Probably …

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Re: Dual PIII-S Tualatin 1.4 GHz Success Stories

Posted on 2021-01-31, 20:51

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just got my first working dual Tualatin with Gigabyte GA-6VXD7 (VIA 694X) rev 1.0 mainboard :) after a unsuccessful (work in progress though) attempt on Tyan S1834D https://www.vogons.org/viewtopic.php?f=46&t=77814&p=913592 Current specs: GA-6VXD7 - needs a recap, but works and is stable Two 1. …

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Re: PCI Riser Card capacitors - required on all thin clients?

Posted on 2021-01-30, 16:07

by

by adalbert

in Marvin \ Sound

in Marvin \ Sound

Did you buy proper version of this converter? Because there are listings for different versions - step up, step down and inverting. It depends on the wiring, resistors and capacitors used on the board. You can also try setting the voltage with little screw on the potentiometer. Make sure that you …

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Re: AGP to PCI adapters - any PCB designers here willing to make one?

Posted on 2021-01-29, 20:03

by

by adalbert

in Marvin \ Video

in Marvin \ Video

Okay, this is exactly the same IC i wanted to use too. But I didn't start designing the PCB yet.

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