Problem with MV035 OPTi 486 motherboard \ VOGONS

Problem with MV035 OPTi 486 motherboard

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First post, by RiP

Posted on 2019-08-08, 12:55

RiP Offline

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I have found an MV035 REV.F motherboard which works fine but it didn't have voltage regulator.
So I added SPX2815AU Adjustable (LT1086 compatible) to it but now it doesn't work at 3.45V
It booted fine with AMD 5x86 at 3.3V but I worry since this CPU needs 3.45V 😐

Another problem is that I wanted to use four 64KB cache chips but seems it requires 16KB tag RAM.
Sadly, 16KB chip is rare and it doesn't work with 32KB tag RAM unless I use eight 32KB cache chips 😵

https://stason.org/TULARC/pc/motherboards/D/D … -BUS-MV035.html
http://www.elhvb.com/mobokive/Archive/Edom/ma … mv035/mv035.htm

Reply 1 of 5, by derSammler

Posted on 2019-08-08, 13:08

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As for voltage, the datasheet says:

"VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 V ±0.3 V"

So anything from 3.0 to 3.6 is fine.

Reply 2 of 5, by RiP

Posted on 2019-08-08, 13:12

RiP Offline

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Oh, seems the voltage jumper was faulty. I replaced it and the motherboard works fine at 3.45V now 😊

derSammler wrote:
As for voltage, the datasheet says:

"VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 V ±0.3 V"

So anything from 3.0 to 3.6 is fine.

Then won't it work at 4.0V ?
What about LT1086?

Reply 3 of 5, by derSammler

Posted on 2019-08-08, 13:20

derSammler Offline

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Why do you want to run it with 4.0V? If you go higher than 3.6V, you may fry the chip.

Reply 4 of 5, by RiP

Posted on 2019-08-08, 18:57

RiP Offline

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derSammler wrote:
Why do you want to run it with 4.0V? If you go higher than 3.6V, you may fry the chip.

I know, just wanted to know about the model of regulators, LT1086 vs SPX2815AU

Reply 5 of 5, by RiP

Posted on 2019-08-09, 13:36

RiP Offline

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derSammler wrote:
As for voltage, the datasheet says:

"VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 V ±0.3 V"

So anything from 3.0 to 3.6 is fine.

Where did you find it?

Oh, just solved all the problems. The cache chips were fake 😵
Now it works with four 64KB cache chips and even 32KB tag RAM 😊

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