Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-29, 18:00

by

by sliderider

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah crap. One of mine has a wire permanently jumpered across JP17. I'll have to check the other one to see if it has it or not. WHEW! The other one has a normal jumper there. I was getting nervous for a minute. Would it be possible to solder in the required pins to make JP17 active or is there …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-29, 18:04

by

by sliderider

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

retro games 100 wrote: Here ya go! :happy: Please note that I am looking for a job working as a motherboard manual writer. […] Show full quote Here ya go! 😀 Please note that I am looking for a job working as a motherboard manual writer. Just don't apply for a job as an illustrator. 😜

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-30, 10:19

by

by udam_u

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@rg100 Thank you! Your drawing explains everything! Unfortunately my am5x86 ADZ don't want to boot at 200MHz even when set to 5V... Currently I use small ATX power supply with ATX to AT adapter instead of AT power supply. Here is a picture of my PSU: http://images.esellerpro.com/2131/I/199/65/ …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-04-30, 11:48

by

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Re: PSU. That's very interesting. I wonder, is this problem due to the ADZ architecture, or is the PSU an important factor? Could it be a combination of the two? I wonder which issue is more pertinent, the ADZ or the PSU? I use two PSUs for all of my testing. This is completely "over the top", but I …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-03, 08:48

by

by udam_u

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I use two PSUs for all of my testing. This is completely "over the top", but I do this in order to eliminate all uncertainty about the quality of the power supply. I use two Enermax PSUs, model number EG465P-VE. There are other good similar PSUs you can get, such as the ThermalTake 480APD. One PSU …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-04, 16:42

by

by udam_u

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What is the latest bios for MB-8433UUD rev. 2 and where can I find it? Thanks! [:

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-04, 22:06

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What is the latest bios for MB-8433UUD rev. 2 and where can I find it? @udam_u I have attached two SST BIOS versions, one from March 26 1996, the other from May 20 1996. Use at your own risk. If your BIOS chip has a ~7 mm hole on the top, you cannot flash it as far as I know. You may even ruin the …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-05, 10:49

by

by udam_u

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you feipoa! I wasn't able to find this bios on the internet. Unfortunately bios on my motherboard has this small window. Have you ever removed award sticker from your bios? If so, what is typed on it? Maybe I can find the same part on one of my damaged motherboards... ^^

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-05, 11:09

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by iulianv

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

UV-erasable EPROMs (the "small-windowed" chips) cannot be reprogrammed using "regular" utilities like AWDFLASH, UNIFLASH and so on... I recently managed to ruin the BIOS of a 486 PCI board this way (somehow the utility managed to erase something, but failed to complete the flashing process) - I had …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-05, 11:26

by

by retro games 100

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Regarding these older style UV BIOS chips - the ones with the "little window" on them - first, they need to have their contents erased using a UV eraser device, and then second, your chosen BIOS file needs to be programmed in to them, using a BIOS programmer. The mobo cannot do this programming for …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-06, 07:57

by

by udam_u

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks guys! (: The idea of sending chip to "bios repair dude" :D is good but maybe I have the same EE Flash as feipoa on one of my few damaged motherboards. If so, it would be cheaper to use EE flash+awdflash+motherboard than "bios repair dude" :D service. BTW I heard that you can erase UV-erasable …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-06, 08:59

by

by iulianv

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've heard it would have to be a _really_ long exposure 😀 weeks, that is...

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-06, 09:43

by

by Tetrium

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

iulianv wrote: I've heard it would have to be a _really_ long exposure 😀 weeks, that is... Get one of these 😁

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-07, 11:10

by

by udam_u

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

iulianv wrote: I've heard it would have to be a _really_ long exposure 😀 weeks, that is... Tetrium wrote: Get one of these He he he ok, so I'll ask for help my friend who goes often to solarium or I'll take it when I go on vacation! 😁

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AMD K6-266 vs. Cyrix MII-400GP @ 263 Mhz

Posted on 2011-05-08, 02:12

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have an AZZA PT-5IT socket 7 motherboard (not a super7). It has 512 KB pipeline burst write-back cache that can accept 256 MB SDRAM (DIMM) or 256 MB EDO RAM (SIMM). Of course, it can only cache up to 64 MB as there is no write-through option in the BIOS. It uses the Intel 430TX chipset and has …

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Re: AMD K6-266 vs. Cyrix MII-400GP @ 263 Mhz

Posted on 2011-05-08, 09:27

by

by Tetrium

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looking at the voltage options, I'd say there could be more undocumented voltage settings available (depends on how the other voltages are jumpered.

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Re: AMD K6-266 vs. Cyrix MII-400GP @ 263 Mhz

Posted on 2011-05-08, 09:36

by

by Tetrium

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Heres what I mean, the empty spots may have another usable voltage to pick from 😉

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Re: AMD K6-266 vs. Cyrix MII-400GP @ 263 Mhz

Posted on 2011-05-09, 03:05

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the link, I'll give Jan a call. How did you determine that linear burst wasn't working on the MII cpus? Is this a factor of all i430TX chipsets? Do some BIOSes have a workaround for this to enable LINBRST functionality? The oddity I've noticed with MII's and cyrix MX cpus is with CTCM, it …

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Re: AMD K6-266 vs. Cyrix MII-400GP @ 263 Mhz

Posted on 2011-05-09, 03:48

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by unmei220

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Intel chipsets just don't support Linear Burst. Chipsets from other manufacturers like VIA, SiS, OPTi, ALi, etc almost all support it. I couldn't find a tool or a way to know if this feature is enabled by default or you have to make something to enable it. For example, I have another PCChips M571 …

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Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?

Posted on 2011-05-11, 23:00

by

by sebaz_ri

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@feipoa How i can overclock the IBM 5x86 on a PcChips m919 v 3.4 b/f i try with 5V and 2x 66 multiplier but it gets stuck at "133 MHz CPU Clock"

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