Re: Pentium on a 386 motherboard ( sort of)

Posted on 2021-02-21, 10:44

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Performance @ 83 MHz has been rather disappointing so far. The CPU performance is amazing, but L2/mem remains still @ mediocre 386 levels which is holding back the performance. Hope it can be tuned slightly higher. So overall it is a hair better than a 486DX2-66 on average 486 board. Getting about …

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Re: Pentium on a 386 motherboard ( sort of)

Posted on 2021-02-20, 22:09

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Next step: insert another PGA237 socket between the PODP and the PGA169, connect all appropriate pins to VCC and GND, set bus to 33MHz, enjoy! :) I 've been thinking about this. However, it would probably only make sense with external Molex adaptor as the point of these extra pins is to protect the …

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Re: Pentium on a 386 motherboard ( sort of)

Posted on 2021-02-20, 21:54

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did your board originally come with an AMI BIOS? Could you dump the MR BIOS? Frankly, I am not sure which BIOS is native for this motherboard. It is quite beaten-up board. It came to me with Award BIOS which I only had problems with (HIMEM.SYS failing, L2 cache not working). It was in EPROM with " …

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Re: Pentium on a 386 motherboard ( sort of)

Posted on 2021-02-20, 20:02

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

kolderman wrote on 2021-02-20, 20:00: Cool. But what on earth is that AT2ATX device? Has it got a live display? That's really cool. Where did you get it from? Yes. ATX2AT Smart Converter - Live on Kickstarter!

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Pentium on a 386 motherboard ( sort of)

Posted on 2021-02-20, 18:59

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was wondering what would be the perfect upgrade for my 386 system. It has 386DX-40 soldered-in, an unpopulated 386 PGA socket and a socket for either 387 FPU or 486 PGA or (might take a Weitek as well - not sure) and even might come with a soldered-in 486SX PQFP. A plenty of options... But how …

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Re: Bought these (retro) hardware today

Posted on 2021-02-19, 09:44

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

brownk wrote on 2021-02-19, 06:59: GRAVIS-ACE.jpg Got this delivered on my desk. I've been looking for V1.1 for a long long while and finally here it is. Great. Compared to 1.0, does it have anything extra apart from reversed stereo?

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Re: Original Hardware: PCI clock measuring device.

Posted on 2021-02-18, 18:53

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Love it. One for me please.

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Re: 486 CPU upgrade

Posted on 2021-02-16, 17:07

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The socket doesn't matter. The extra ODP pin (D4) doesn't matter either. If you have a ODP version, you can clip the pin and it would work just as well in normal socket as it has no electrical function. It just prevents non-technical people from installing it upside down which apparently happened a …

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Re: The World's Fastest 486

Posted on 2021-02-16, 12:31

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Crazy that these numbers are actually faster than a regular P100. Unless using Triton chipset with PB cache (which can push it to 2-3 fps higher).

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Re: Abit AB-PB4 twin paradox

Posted on 2021-02-15, 15:09

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does anyone have an idea what the root cause of the difference could be? Should I do a chipset register dump? If so, how? You can easily dump/modify chipset registers with debug.exe from ms-dos. Just in case BIOS is buggy and don't set something up. First unlock them: -o 22 03 -o 23 c5 then read …

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Re: Bought these (retro) hardware today

Posted on 2021-02-12, 15:57

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

99p is an adequate price for this 😀 Some people are converting these to benches or furniture.

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Re: Bought these (retro) hardware today

Posted on 2021-02-11, 20:10

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

debs3759 wrote on 2021-02-11, 18:42: Any idea which S3 chip is under the Orchid sticker on the Fahrenheit 64 VLB? I'd like to add it to gpuzoo.com if you know? Either S3 864 or 868. Not quite sure.

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Re: ATX to AT adaptor -5V

Posted on 2021-02-11, 20:07

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No only a relatively small number of cards is using -5V. There is a nice list in this thread - Re: ISA Cards & Devices Requiring -5V

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Re: Bought these (retro) hardware today

Posted on 2021-02-11, 10:46

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bought two interesting (not the usual Cirrus Logic) VL-Bus cards. They've never been used apparently. Need to get memory upgrade for the Tseng so that it can benefit from bank interleaving.

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Re: Bought these (retro) hardware today

Posted on 2021-02-10, 14:50

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bought some new variants of Diamond Stealth Trio PCI cards. Now I am not sure which are new and which I already had 😀

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Re: Socket 3 pinout help

Posted on 2021-02-08, 22:33

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DX4 is a 3.3V CPU. Thus you should see 3.3V between VCC and VSS pins but it obviously operates in 5V environment as the rest of the motherboard is 5V. Thus you'll see 5V voltage elsewhere. Your scheme seems to be for a socket. It has way more pins than the 486 CPU as outermost pins are for Pentium …

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Re: Bought these (retro) hardware today

Posted on 2021-02-08, 21:22

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bought a bunch of PGA132 sockets. Now taking courage to downgrade one of my 486 boards to 386.... Filename DSC_9092 (1).jpeg File size 510.38 KiB Views 1838 views Filename DSC_9093.jpeg File size 814.65 KiB Views 1838 views

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Re: The World's Fastest 486

Posted on 2021-02-07, 16:32

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A well tuned P60 can run Quake at ~19fps which is faster than most 486 (except for 486 record holders above). 20fps was luxury framerate for games in early 90s.

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Re: Nexgen - the 486 killer - WIP

Posted on 2021-02-07, 15:06

by

by mpe

in Marvin \ System Specs

in Marvin \ System Specs

yes those were captured on this system It was just a hyperbole. In reality the performance of NexGen P90 is sometimes inferior even to 486DX4-100 in some benchmarks. Especially graphics tests in DOS. See also http://retronn.de/imports/nexgen_nx586.html

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Re: [IDE controller] CMD640/PCI0640B data corruption bug

Posted on 2021-02-07, 14:55

by

by mpe

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sadly, it is not just primary/secondary data corruption bug. There are about 5 different bugs affecting CMD640 (multi-read prefetch, corruption of data during floppy activity, simultaneous IO on primary/secondary channels, lack of 32bit writes support, ...) and 2 bugs affecting RZ-1000 variant. Some …

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