Re: What chip for socket 3 motherboard BIOS?

Posted on 2021-01-13, 19:40

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried searching for this part number on mouser but it was listed as discontinued. Is there another variant that mouser sells that I can use? Should I just order 128kb variants and use that for BIOS files that are 64kb or should I use the "correct" size for the motherboard? 128KB chip may work, …

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Re: PCIe card in AGP slot. Do such adapters exist?

Posted on 2021-01-12, 22:11

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

All right, so to get proper AGP bridge working i guess that I could get 6600 PCI-E and 6600AGP, desolder both BGA chips and find PCI-E signals on BGA pads by probing them (that would be the only purpose of PCI-E 6600 card, because I can't find datasheets). Then I would carefully solder wires, …

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

Posted on 2021-01-12, 20:11

by

by adalbert

in Marvin \ Sound

in Marvin \ Sound

Does the MC34063A converter supply only negative (-12v) current? Yes, this module has only 3 pins: +voltage input, GND, -voltage output. It will only output negative voltage. But after you solder positive voltage wire (may be +5V OR +12V) and GND, you need to calibrate correct voltage output (-12V) …

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

Posted on 2021-01-12, 19:36

by

by adalbert

in Marvin \ Sound

in Marvin \ Sound

I am 99,9% sure that it is meant for MC34063A converter. It used to be very popular and cheap, I also used it in custom PCB design some time ago. Compare these two: mc34063_compare.png https://www.ebay.com/itm/MC34063A-Reverse-Voltage-Module-Positive-To-Negative-Voltage-Converter-CO-HFWMJI/ …

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Re: Intel smashes Ryzen

Posted on 2021-01-12, 16:58

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by adalbert

in Milliways

in Milliways

Intel Rocket Lake Core i9-11900K is set to have a TDP/PL1 of 125 W and a PL2 turbo power limit of 250 W, with a turbo time of 56 seconds. Let's also add this: RTX3090 TDP 350 W Suggested PSU 750 W This isn't how I imagined the future.

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Re: PCIe card in AGP slot. Do such adapters exist?

Posted on 2021-01-11, 17:10

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks interesting, although it does the reverse thing. But maybe its bridge chip would be bidirectional. Anyway, i am also thinking about different approach, so I looked up some info about these PCIe - PCI adapters: https://www.amazon.com/StarTech-com-Express-Adapter-Card-PCI1PEX1/dp/B0037ECAM2 …

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Re: PCIe card in AGP slot. Do such adapters exist?

Posted on 2021-01-11, 16:23

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay, so that actually would be the one that was on picture. I'm trying to find datasheet for NV43 chips or schematics for graphic cards, I didn't find anything easily accessible yet. Here is something but I'm not able to download it, if anybody could help it would be appreciated. http://vlab.su/ …

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Re: PCIe card in AGP slot. Do such adapters exist?

Posted on 2021-01-11, 13:57

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PCIe 1x only uses a few wires, so I was thinking about doing something like this: Designing a PCB for BGA chip would be very difficult, but this way existing AGP card could be used as a 'donor'. I wonder if this would have a chance to work. Are there any 'cheap' AGP cards with PCIe bridges that …

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PCIe card in AGP slot. Do such adapters exist?

Posted on 2021-01-11, 13:41

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've been testing PCI version of Zotac GT520 with Pentium 3 1.4 GHz. It's not a great card, but has working H.264 video acceleration. Unfortunately PCI bus gets saturated easily and overall performance is not that good. PCIe to PCI adapters obviously do exist, either as standalone devices, or …

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Re: MS-6905 slotket V2.3 works fine, V2 only at 100MHz

Posted on 2021-01-07, 20:16

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Please use this guide for performing mods (at least for getting to work in single mode): http://www.rom.by/articles/S370/_english_part3.htm And you will not get it to boot or stable running in most cased without bridging AK4 to VTT (preferrably through resistor, but works mostly without too). …

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Re: GDDR SDRAM vs DDR SGRAM Radeon 9000 BGA memory replacement

Posted on 2020-12-31, 02:18

by

by adalbert

in Marvin \ Video

in Marvin \ Video

That's an interesting design being a two piece GPU. Hopefully after you get the last set of chips replaced you'll have a fully functional piece. Oh, actually it's a one piece, I just combined the photos of top and bottom side in one image :) Large connector goes to the mainboard, smaller is for …

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Re: GDDR SDRAM vs DDR SGRAM Radeon 9000 BGA memory replacement

Posted on 2020-12-31, 01:57

by

by adalbert

in Marvin \ Video

in Marvin \ Video

I admire your determination, considering how inexpensive Radeon 9000s still are . I also wish I had your skill and equipment to be able to reflow and/or solder BGA components. Thanks. Well, yeah, they are, but this is a tiny mobile version for Inspiron 8100 laptop. And it seems to be a very rare …

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Re: GDDR SDRAM vs DDR SGRAM Radeon 9000 BGA memory replacement

Posted on 2020-12-30, 22:13

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by adalbert

in Marvin \ Video

in Marvin \ Video

I just replaced two (out of four) original Infineon HYB25D128323C-3.6 128 Mbit DDR SGRAM chips with two NOS Samsung K4D263238G GC33 128Mbit GDDR SDRAM chips. I managed to get a clean image, but occasionally artifacts do appear. So it looks like DDR SGRAM may be compatible with GDDR SDRAM, I will …

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Retrofitting Li-Ion cells with BMS circuit into Ni-MH laptop battery packs?

Posted on 2020-12-28, 16:55

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Let's say we have a 14,4V Ni-MH laptop battery pack with 12 x 4/3A sized 1,2V Ni-MH cells. They are wired in series and use a dumb charger. There is no balancing circuitry at all. There usually is only one temperature sensor. Voltage may be uneven on some cells, which causes generation of heat until …

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Re: What retro activity did you get up to today?

Posted on 2020-12-26, 11:51

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Had to desolder voltage regulator, bend the pins and shift it a bit, because of poor placement on a mSata - IDE adapter... (flash chips were touching the edge of regulator) Filename IMAG2958.jpg File size 117.75 KiB Views 499 views Filename IMAG2960.jpg File size 366.98 KiB Views 499 views Filename …

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Re: How do people storage their computer stuff (motherboards, video cards, CPUs)

Posted on 2020-12-25, 19:48

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't have retail boxes for most hardware (and I'm not interested in buying/collecting boxed stuff), so I pack everything pretty densely. I recently started using ESD shielding bags with internal bubble wrap layer. They are very good, much stiffer and stronger than regular bubble wrap or regular …

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Re: The quest for the perfect retro laptop: a saga

Posted on 2020-12-23, 20:47

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I get ~70MB/s with 32GB KCC-REM-SEC-MZ-MPC256D (some kind of OEM/Samsung drive?) and JM20330 mSATA - IDE adapter on Inspiron 8100, so it's not as terrible as you describe

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Re: Toshiba T5200 mods and upgrades

Posted on 2020-12-22, 23:39

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by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the info! Although the availability isn't great indeed.

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Re: Toshiba T5200 mods and upgrades

Posted on 2020-12-22, 23:01

by

by adalbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh, that's nice. It would be great to know what type of connector is used there, as it should be fairly easy to make a breaakout box for external ISA slot.

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Re: VGA Capture Thread

Posted on 2020-12-21, 22:44

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by adalbert

in Marvin \ Video

in Marvin \ Video

I tested this VGA to HDMI scaler: https://aliexpress.com/item/32971318124.html What's bad about it? *Quality is terrible: -scaling artifacts: white is not pure white but slightly grey; texts and sharp lines can have have bright white outline -vertical image banding -switching resolution between 720p …

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