Help me choice for a VLB, 5V 486 configuration. \ VOGONS

Help me choice for a VLB, 5V 486 configuration.

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First post, by jammaster

Posted on 2019-04-21, 14:17

jammaster Offline

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Hello!

I already own a great 486 class setup machine with a POD83, PCI mobo, GUS, OpenGL PCI card and sexy baby case.
I have a spare cool empty tower with a chinese VLB mobo.
This mobo take 50mhz FSB (with wait state for VLB).
She have an optionnal 10pins connector for an 3.3V VRM. (between two ISA slots).
I'd like to build a real 486 machine back in days with a classic chip.
...And with staying in 5V. finding a VRM is almost impossible.
The question:
Do i need to go with the classic I486DX2 on a 33Mhz FSB? i think about a cool version with the stock glued blue heatsink.
I have the choice (in 5V) to go with a rare CX486DX2-80 on a 40Mhz FSB. It will make an average solution for duke nukem 3D...
But not really an historical machine with a cyrix CPU 🙁
I have a AWE32 for it.
Need advice about a fast VLB framebuffer.
ALG2228 ?
S3 Vision ?
Cirrus Logic GD5426-28 ?
A fast Western Digital card ?

thk 😄

Reply 1 of 7, by dionb

Posted on 2019-04-21, 14:32

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If the board takes 50MHz FSB, a 486DX-50 would be a nice option.

As for VLB do you already have the cards you mention? And what do you want to run? DOS only or also Windows? WD doesn't do more than 8b, but is very good at that. Ark is also fast but not great in Windows. S3 VRAM chipsets are mediocre at DOS but shine in Windows. Tseng ET4000W are excellent but expensive .Tbh I'd go with whatever you can easily find unless you have the luxury of a lot of choice.

Reply 2 of 7, by jammaster

Posted on 2019-04-21, 14:47

jammaster Offline

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Yes the board takes the daemon 50Mhz. Don't know if it'll be stable.
I'll run purely DOS games and probably put a Win9X just for the "form".
The board is exactly this one:
https://stason.org/TULARC/pc/motherboards/U/U … OTHERBOARD.html

I have strange stickers on the chipset. an "MREX" logo. precisely a "REX" logo on a "M" backround (!!!).
Don't know what brand it is...

Reply 3 of 7, by jammaster

Posted on 2019-04-21, 14:50

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will love this one 😄:

S_Intel-A80486DX2-66%20%28with%20heatsink%29.jpg

Reply 4 of 7, by rasz_pl

Posted on 2019-04-21, 16:49

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jammaster wrote:
Hello!
She have an optionnal 10pins connector for an 3.3V VRM. (between two ISA slots).
...And with staying in 5V. finding a VRM is almost impossible.

VRM is trivial to make, you are probably just missing a linear regulator

jammaster wrote:
a rare CX486DX2-80 on a 40Mhz FSB

Intel 486DX2-66 should overclock just fine to 80, needs a small heatsink+fan

Open Source AT&T Globalyst/NCR/FIC 486-GAC-2 proprietary Cache Module reproduction

Reply 5 of 7, by jammaster

Posted on 2019-04-21, 18:10

jammaster Offline

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Did you think a 5V DX2-66 can overclock easly at 80Mhz ?
A 3.3V AMD, sure, but a 5V ?

Reply 6 of 7, by rasz_pl

Posted on 2019-04-21, 18:34

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jammaster wrote:
Did you think a 5V DX2-66 can overclock easly at 80Mhz ?
A 3.3V AMD, sure, but a 5V ?

I ran one back in ~1995, so yes

Open Source AT&T Globalyst/NCR/FIC 486-GAC-2 proprietary Cache Module reproduction

Reply 7 of 7, by jammaster

Posted on 2019-04-21, 18:36

jammaster Offline

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ok 😄

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