VOGONS

BVC1B , FSB wall. What's wrong with you?!

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First post, by ApostolCV

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Hello for great retro community!
I must confess that i have weakness for VIA boards. 😉
"But BX is better and other bla-bla-bla" , not today please.

A lot time before i play with that board. In my mind it should be a good baby AT board with full specs such AGP PCI and s370 (from Mendocino to Tualatin). Potentially....!
But in experiments reality kick my balls.
I had made CuMine mode at rear of socket but maximum i can gate is 85 MHz FSB.
Of course, now at theretroweb you can see inscription " do not post at FSB 100MHz or grater"
For me it's looks like a bad joke . As i say 85MHz is max if you start from 66MHz base. And no post if you use 100MHz by using jumpers.
Let's summarise.
The board used Apollo Pro Plus chipset which should work at 100MHz .
Clocker at motherboard can work from 66MHz -100-133. (with right divider). I'm surprised why the used such good clocker for such cheap mobo.
Finally some qute from manual:

The BVC1B supports system bus speeds of 100MHz, while internal
CPU data transmissions take place at 66MHz

- looks like something that contradicts itself.

Clock Generator66.8, 68.5, 75, 83.3, 100MHz

- yes, yes , even more 😉
II'd love to hear your thoughts on this matter. Maybe I'm the only loser here who couldn't get this board to run at 100 MHz. Soldering iron freaks welcome.

Reply 1 of 3, by BitWrangler

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Which CPU are you trying this with? An unmodified 66Mhz FSB CPU will lock the board to the "66Mhz" range, 60-83 or sometimes as low as 50 as high as 95.

Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 2 of 3, by ApostolCV

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BitWrangler wrote on 2026-04-21, 13:21:

Which CPU are you trying this with? An unmodified 66Mhz FSB CPU will lock the board to the "66Mhz" range, 60-83 or sometimes as low as 50 as high as 95.

I had use CuMine Celerons and P3.(which originally has FSB 100MHz)

Reply 3 of 3, by shevalier

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ApostolCV wrote on 2026-04-21, 12:40:

"But BX is better and other bla-bla-bla" , not today please.

Why?
I’ve always said, and will continue to say, that the best BX is the S754 Athlon 64 Venice Core with a model number ending in ‘BX’, such as ADA3200AIO4BX. 😀

Maybe I'm the only loser here who couldn't get this board to run at 100 MHz. Soldering iron freaks welcome.

0. Set the memory frequency to 66 MHz in the BIOS (this may be named as ‘FSB-PCI’; ‘FSB+PCI’ only appears on the Apollo 133A)
1. Check the VTT voltage (1.5 V) and the IC clock supply voltage (2.5 V)
2. Check the on-board DC-DC 5V to +3.3V. It is always active, even if an ATX PSU is connected (there is a common misconception that it somehow magically switches off)
For that era, it’s quite good if it’s boosted to 3.45–3.5V
3. Electrolytic capacitors....
4. There may be serious issues with the BIOS.

Aopen MX3S, PIII-S Tualatin 1133, Radeon 9800Pro@XT BIOS, Audigy 4 SB0610
JetWay K8T8AS, Athlon DH-E6 3000+, Radeon HD2600Pro AGP, Audigy 2 Value SB0400
Gigabyte Ga-k8n51gmf, Turion64 ML-30@2.2GHz , Radeon X800GTO PL16, Diamond monster sound MX300

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