VOGONS

Need help with new Win 98/DOS build

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First post, by Neobr10

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Hello everyone,

I'm new to building retro machines and i have just recently built my first retro PCs.

So, the latest PC i built was heavily inspired (almost copied, actually) by the "4 in 1 retro PC" project from PhilsComputerLab (https://www.youtube.com/watch?v=fcAqRbFFQPU). The specs of the machine are the following:

K6-3+ 400Mhz 1.6V
Gigabyte GA-5AX
256MB RAM
S3 Virge GX2 4MB
Voodo 1 4MB
Sound Blaster Awe 64 Gold
A Floppy drive + old Creative CD ROM drive + 128GB SSD using a SATA-IDE adapter
I'll also hook a Roland SC-55 mk2 to it.

The idea is to use this PC to run DOS games and be able to use setmull to get the CPU speed down for those speed sensitive titles.

But i ran into some kind of road block when setting the switches for the voltage and multiplier on the motherboard due to my inexperience building old rigs. I don't know if i set the switches properly on the MB, especially the ones for the voltage. It does POST correctly, but i was affraid of letting it run for longer, i don't want to over or undervolt the CPU or something. I'm sending the pictures from the diagrams and the switches on the motherboard attached.

I'm very sorry for the noobish question.

And i'd like to thank PhilsComputerLab for his amazing channel and website. I got a lot of information, drivers and software from there. Helped me so much.

Reply 1 of 2, by waterbeesje

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From what I've heard, the 1,6v k6 3+ feels quite comfortable with 2,0v, as it was designed for 2,2v / 2,4v and turns out to handle lower voltages quite well. It's a factory undervolt (just as the 3,2v for k6 233 was a factory overvolt). If you put decent cooling on it (socket A cooler, just fits oob) it should be ok.

My own K6-3+ 400 is rated 2,4v but also runs fine at 2,1v 😀 Same manufacturing, yours would need newer and thus is "better" than mine, which allows for either higher clock speed or lower voltage.

Stuck at 10MHz...

Reply 2 of 2, by Warlord

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up,down,up,down,up,up,down,up is 400mhz 1.6v IF it wont run increase to voltage by .1 until it posts.

It explains in the manual that O means on and X means off. If the switch is up that is on if the switch is down that means off. 1st 3 switches are for the CPU frequency, last 5 are for the voltage. It right in the manual where it should be.

https://www.philscomputerlab.com/uploads/3/7/ … _5ax_5202_e.pdf

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