Re: 0.5um AM486DX4 @ 150MHz?
Posted on 2019-01-07, 13:48
Tried that too, but couldn't get system to POST @ 4V from freezing temperature.
Re: 0.5um AM486DX4 @ 150MHz?
Posted on 2019-01-07, 13:34
What I recommend is first determining which motherboard and hardware settings will run properly with an Am5x86-133 ADZ or ADW at 3x50 MHz. Ensure that system is stable. Done and ensured. System that I used to OC DX4 works rock solid with 5x86 @ 150MHz, it can even do 180MHz at room temp., but it's …
Re: 0.5um AM486DX4 @ 150MHz?
Posted on 2019-01-07, 08:38
The Serpent Rider wrote: efficient cooling below zero Celcius temperatures You just gave me an idea.
Re: 0.5um AM486DX4 @ 150MHz?
Posted on 2019-01-07, 07:36
Anonymous Coward wrote: you'd probably have to dig through dozens of chips to find one that worked okay As I expected, you'd have to win silicon lottery, basically. Could somebody give theirs DX4s a try and post a proof of reaching 150MHz?
0.5um AM486DX4 @ 150MHz?
Posted on 2019-01-06, 21:34
Has anyone successfully overclocked a AMD 486DX4 100 or 120MHz to 150MHz? I couldn't find any reliable proof of it on the net, only this thread: My 486 (150MHz and Voodoo!) . I think that Speedsys is misreporting am5x86 CPU there (this CPU was mentioned in youtube video below). I've tried to OC two …
Re: LuckyTech P5MVP3 Rev1.3 - no POST, CPU sometimes cold sometimes warm.
Posted on 2019-01-06, 20:59
Southbridge* my bad, give it a bath then? 😁
Re: LuckyTech P5MVP3 Rev1.3 - no POST, CPU sometimes cold sometimes warm.
Posted on 2019-01-06, 20:39
Hmm, not sure what else could be checked. If it did POST once, then the chipset and BIOS are OK, probably a bad solder joint/corroded via or CPU socket/cut trace/missing SMDs/shorting semiconductors are causing you grief. I see that this mobo uses QFP northbridge, I'd take a really good look at its …
Re: LuckyTech P5MVP3 Rev1.3 - no POST, CPU sometimes cold sometimes warm.
Posted on 2019-01-06, 14:01
CPU core and RAM voltages are in specs w/o load, check if CPU I/O voltage is 3.3V. Retest CPU core and I/O voltages with a non MMX pentium. You should also take a look at ICs in QFP packages for bent pins/debris. Reseat BIOS and inspect socket above and beneath, sticking sharp pins beneath BIOS …
Re: LuckyTech P5MVP3 Rev1.3 - no POST, CPU sometimes cold sometimes warm.
Posted on 2019-01-06, 08:59
CPU sometimes gets warm and other times it stays cold. First thing you have to do now, is figure out why that happens. CPU VRM is a buck converter and it should not give out randomly, unless some power saving mode kicks in from the system. Try to set CPU core voltage to 3.3V and w/o CPU inserted …
Re: Pentium II went kablooy
Posted on 2019-01-06, 08:45
My guess would be a faulty PSU, VRMs on motherboard or anything that has to do with power. Does motherboard use linear or switch-mode voltage regulators for CPU/RAM?
Re: Tomato 4DPS 2.0 + Cyrix DX2-66 - not work
Posted on 2018-12-30, 02:57
If I insert the FLASH system, I need to change the jumper from EEPROM to FLASH on the board ? JP4 is used for Vpp pin of UV EPROM, it allows to select either 5 or 12V as programing voltage and has no use for flash memory. Always set it to 5V if you are using UV chip, else unstable systems might …
Re: Tomato 4DPS 2.0 + Cyrix DX2-66 - not work
Posted on 2018-12-29, 11:35
Yes, ASD AE29F1008-15 is compatible with this motherboard. I know that, because I went the same diagnostic route, by borrowing an easy to program Flash ROM from a working motherboard. If you can read contents off a UV EPROM, it's not damaged.
Re: Faulty Voodoo 2?
Posted on 2018-12-29, 08:55
Try to disable texturing and see if glide apps start.
Re: Tomato 4DPS 2.0 + Cyrix DX2-66 - not work
Posted on 2018-12-29, 08:48
I did corrupt BIOS once on this motherboard by experimenting with different CPU settings and CPUs so if CPU votage/type/freq. are set correctly and CPU does get warm, BIOS corruption just might be the culprit here.
Re: Any cdrom drive technician in the forum?
Posted on 2018-11-18, 03:00
I'm no CD-ROM drive technician, but if drive starts to read discs reliably only when tilted in certain angle, it means that either the laser assembly mechanism or CD-ROM motor axle is worn out, most of the time simple re-lubrication does fix the problem. If tray refuses to open, it's because …
Re: Bought these (retro) hardware today
Posted on 2018-11-07, 14:52
Just got this AMD slot A motherboard/cpu combo, it's equipped with AMD Irongate chipset. DFI-AK70: Worst CPU VRM layout in terms of space-saving I've ever seen, bulgy caps also:
Re: I recently found this hardware, AKA the Dumpster find thread.
Posted on 2018-10-14, 23:56
Found these in the middle of nowhere today, when we went out to tidy up a thicket in our land plot: https://i.imgur.com/By5AYYZl.jpg IBM XT clone with 8 MHz NEC V20, ST-225 MFM HDD, no PSU: https://i.imgur.com/2tbnQmtl.jpg?1 A PII/S370 hybrid in a sorry state: https://i.imgur.com/iVpRAHVl.jpg?1 …
Re: Bought these (retro) hardware today
Posted on 2018-09-04, 01:52
Bought some random lots on ebay because they contained some items I don't have in my collection: 9 AGP/PCI video cards including a Millenium2 and a Riva128 I wonder what were they THINKING by gluing down that tiny TO-220 heatsink on a Riva 128 chip, I mean, it did cost some extra cents to add it, …
Re: Broken Creative Labs 3D Blaster Voodoo2 - deal or ripoff?
Posted on 2018-08-29, 00:50
If that is the only problem with it, then I'd say it's a good deal. Pins can be easily straightened and soldered down using basic tools.
Re: Bad Diamond Monster 3D II Fix
Posted on 2018-08-27, 23:24
anetanel wrote: but what on earth would I do with the other 2998 resistors? 😀
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